Comprehensive Master Guide · Medically Reviewed

FRCS (Tr & Orth) Exam Prep: Interactive MCQ Practice & Viva Domains

Master the FRCS (Tr & Orth) exam with interactive MCQ practice and viva domains. Switch between study and exam modes to track your score and pass today!

7 Detailed Chapters
62 min read
Updated: Apr 2026
Dr. Mohammed Hutaif
Medically Reviewed by
Prof. Dr. Mohammed Hutaif
Verified Content Expert Reviewed

Quick Medical Answer

The FRCS (Tr & Orth) exam typically includes viva and MCQ sections testing knowledge across Trauma, Spine, Children's Orthopaedics, and Basic Sciences. Effective preparation involves comprehensive review of these core domains and extensive practice with interactive multiple-choice questions in both study and exam modes to simulate real exam conditions and solidify understanding.

FRCS: Introduction

FRCS (Tr & Orth) Exam Prep: Interactive MCQ Practice & Viva Domains

Comprehensive 100-Question Exam


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Question 1

A candidate preparing for the FRCS (Tr & Orth) viva section is reviewing the common domains. Which of the following is typically NOT a distinct viva domain in most contemporary FRCS (Tr & Orth) examinations?





Explanation

The FRCS (Tr & Orth) viva examinations typically cover core orthopedic subspecialties such as Trauma, Spine, Children's Orthopaedics, and a dedicated section for Basic Sciences and Principles of Surgery (including anatomy, physiology, pathology, biomechanics, and general surgical principles). While Public Health and Epidemiology are important for understanding healthcare systems and evidence-based practice, they are usually integrated into discussions within other domains or assessed via written papers, rather than forming a distinct, standalone viva domain. The other options represent established viva domains.

Question 2

During the FRCS (Tr & Orth) exam, a scenario is presented involving a 78-year-old patient with multiple comorbidities requiring a total hip arthroplasty. The examiner asks about the most appropriate method for assessing the patient's capacity to consent for surgery. Which of the following is the 'gold standard' principle to adhere to?





Explanation

Capacity to consent is time- and decision-specific. This means it must be assessed in relation to the specific decision at hand (e.g., consenting for a total hip arthroplasty) and at the time the decision is being made, as capacity can fluctuate. A formal psychiatric assessment is not always required; the initial assessment is typically made by the treating clinician. Capacity is not a 'once-and-for-all' assessment. Patients need to understand the material information, including significant risks, but not every single rare complication. Family consent is not legally binding in an adult with capacity; it's only sought if the patient lacks capacity and is often for 'best interests' decisions, not consent in the legal sense.

Question 3

A candidate is being questioned on general principles of fracture healing. The examiner asks about the primary mechanism of bone healing under conditions of rigid internal fixation, such as with a compression plate. What is the characteristic feature of this healing process?





Explanation

Under conditions of rigid internal fixation (e.g., compression plating), where there is minimal interfragmentary motion, bone healing primarily occurs through direct (or primary) bone healing. This involves direct formation of new bone across the fracture gap by osteons, with minimal or no cartilage formation and little to no external callus. This is in contrast to secondary bone healing, which involves significant callus formation (endochondral and intramembranous ossification) and occurs under conditions of relative stability. While revascularization and periosteal cells are important, the defining characteristic of primary healing is direct osteonal reconstruction.

Question 4

Which of the following statements regarding the principles of evidence-based medicine (EBM) is most accurate for a senior orthopedic surgeon?





Explanation

Evidence-based medicine (EBM) is defined as the conscientious, explicit, and judicious use of current best evidence in making decisions about the care of individual patients. It integrates three core components: the best available external clinical evidence (from research), individual clinical expertise, and patient values and preferences. EBM does not exclusively rely on RCTs, although they are high on the hierarchy. Systematic reviews and meta-analyses are generally considered the highest level of evidence. Clinical experience alone is not sufficient, and patient preferences are an integral part of EBM decision-making, not secondary.

Question 5

A 65-year-old male with a BMI of 35 requires a total knee arthroplasty. During the pre-operative assessment, the team discusses strategies to minimize perioperative risks. Which intervention has the strongest evidence for reducing surgical site infection (SSI) rates in elective orthopedic surgery?





Explanation

Administration of appropriate prophylactic antibiotics within 60 minutes prior to incision is a cornerstone of SSI prevention with strong evidence. While MRSA screening and decolonization can be beneficial in high-risk populations or endemic areas, it's not universally recommended as a 'routine' for all patients. Post-operative chlorhexidine showers have weaker evidence for SSI prevention compared to pre-operative preparation. Tourniquet use is common and its impact on SSI is not definitively negative, often outweighed by benefits. Routine allogenic blood transfusion to maintain a high Hb is not indicated for SSI prevention; restrictive transfusion strategies are generally preferred unless clinically indicated for physiological reasons.

Question 6

When discussing the biomechanics of bone, an examiner asks about the unique property that allows bone to withstand repetitive loading without immediate failure, within physiological limits. What is this property primarily attributed to?





Explanation

Bone's ability to withstand repetitive loading and adapt to mechanical demands is primarily due to its continuous remodeling process (Wolff's Law), where old bone is resorbed and new bone is formed in response to stress. Bone is viscoelastic, meaning it exhibits both elastic and viscous properties, and its recovery is not purely elastic. Bone is anisotropic, meaning its properties vary with direction. While bone has good tensile strength, it's not comparable to steel, and its strength comes from a composite structure of both inorganic hydroxyapatite and organic collagen, not solely hydroxyapatite.

Question 7

A candidate is discussing common complications in orthopedic surgery. The examiner asks about the most effective single strategy for preventing venous thromboembolism (VTE) in high-risk orthopedic patients undergoing major lower limb surgery. Which of the following is considered most effective when used correctly?





Explanation

For high-risk orthopedic patients undergoing major lower limb surgery, pharmacological prophylaxis (e.g., LMWH) is generally considered the most effective single strategy. While early mobilization, graduated compression stockings, and intermittent pneumatic compression devices are important adjuncts, pharmacological agents have the strongest evidence for significant reduction in VTE events in this population. Aspirin monotherapy has some evidence, particularly in specific settings like total knee arthroplasty, but LMWH or direct oral anticoagulants (DOACs) are often considered first-line for broader high-risk orthopedic procedures due to stronger efficacy data.

Question 8

In the context of the FRCS (Tr & Orth) written examination, which type of question format is typically utilized to assess a broad range of knowledge across the curriculum?





Explanation

The written component of the FRCS (Tr & Orth) examination typically utilizes Single Best Answer (SBA) questions. This format presents a stem followed by five options, from which the candidate must choose the one best answer. This allows for broad coverage of the curriculum in a time-efficient and objectively marked manner. LEQs and SAQs are less common in modern high-stakes surgical exams due to marking variability and time constraints. Oral presentations and OSCEs are components of the viva/clinical sections.

Question 9

A young surgeon is preparing to perform a complex wrist arthroscopy. The patient is a professional musician. Beyond obtaining standard informed consent, what additional ethical principle is paramount in this specific scenario?





Explanation

While all listed ethical principles are important, the question implies a scenario beyond basic consent, focusing on the patient's specific circumstances (professional musician). In this context, beneficence becomes paramount. It means not only acting in the patient's best medical interest but also considering their specific life circumstances and aspirations. This might involve discussing risks and benefits in the context of their career, exploring all reasonable treatment options (surgical vs. non-surgical), and involving multidisciplinary teams to optimize functional outcomes critical for their profession. Autonomy relates to consent itself, non-maleficence is about avoiding harm, justice about fair allocation, and confidentiality about privacy. Beneficence here encapsulates the comprehensive 'doing good' for this specific patient.

Question 10

Regarding the fundamental principles of wound healing, which phase is primarily characterized by the deposition of collagen and re-epithelialization?





Explanation

The proliferative phase (or fibroblastic phase) is characterized by fibroblast proliferation, collagen deposition, granulation tissue formation, angiogenesis, and re-epithelialization. The inflammatory phase involves immediate vasoconstriction, platelet aggregation (hemostasis), and then vasodilation with migration of neutrophils and macrophages. The maturation/remodeling phase involves collagen cross-linking, wound contraction, and increasing tensile strength. Hemostasis is the initial clot formation. Ischemic phase is not a standard phase of wound healing.

Question 11

An examiner asks about the key principles of trauma management according to ATLS (Advanced Trauma Life Support). Which of the following represents the correct sequence of the primary survey components?





Explanation

The correct sequence of the ATLS primary survey is A (Airway with cervical spine protection), B (Breathing and ventilation), C (Circulation with hemorrhage control), D (Disability/Neurological status), and E (Exposure and environmental control). This systematic approach ensures life-threatening injuries are identified and managed in order of priority.

Question 12

In the context of bone tumors, an examiner asks about the typical radiological appearance of a benign, slow-growing lesion. Which feature is most suggestive of a benign process?





Explanation

A sclerotic margin (rim of reactive bone) and a narrow zone of transition (well-defined border between normal and abnormal bone) are classic radiological features indicating a slow-growing, benign lesion. Permeative cortical destruction with a wide zone of transition, a 'sunburst' periosteal reaction, aggressive soft tissue mass, and Codman's triangle are all features typically associated with aggressive, malignant bone lesions.

Question 13

Which anatomical structure is most commonly injured in a Schatzker Type II tibial plateau fracture?





Explanation

A Schatzker Type II tibial plateau fracture involves a split and depressed fracture of the lateral tibial plateau. The lateral meniscus is commonly trapped and torn in the depressed fragment due to the impaction mechanism. While other structures can be injured, the lateral meniscus has the highest incidence of associated injury in Type II fractures. MCL is associated with medial plateau fractures, PCL with posterior, popliteal artery/peroneal nerve can be injured in severe trauma but not specifically linked to Type II as primary association.

Question 14

A 45-year-old patient undergoes an open reduction and internal fixation of a distal femur fracture. Which of the following is the most important factor influencing the decision for early weight-bearing in this patient?





Explanation

The stability of the fixation achieved at surgery is the most important biomechanical factor determining safe weight-bearing. If the fixation is stable, controlled weight-bearing can be initiated earlier. While patient's age and health status, fracture location, and pain tolerance are relevant for overall rehabilitation, they do not supersede the biomechanical stability provided by the implant construct. Surgeon's personal preference should be guided by evidence and biomechanical principles.

Question 15

When advising a junior colleague on effective communication with patients, the examiner emphasizes the importance of 'breaking bad news' effectively. Which component is crucial for effective communication when delivering difficult news?





Explanation

Assessing the patient's perception and understanding (what they already know or suspect) is a crucial initial step in breaking bad news, as per frameworks like SPIKES. This allows the clinician to tailor the information delivery to the patient's level of comprehension and emotional state. Delivering information too quickly or using excessive jargon can increase distress and reduce understanding. Ignoring emotions is counterproductive to empathetic care. A detailed discharge summary is important later but not the immediate priority for initial communication of bad news.

Question 16

The concept of 'never events' in surgery is introduced. Which of the following best describes a 'never event' in the context of clinical governance?





Explanation

Never events are serious, largely preventable patient safety incidents that have the potential to cause serious patient harm or death, and which are specifically designated as such because national guidance and safety recommendations exist to prevent them. They represent failures in safety systems. While other options describe adverse events or quality issues, 'never events' have a specific, defined meaning related to preventability and national guidance.

Question 17

A 30-year-old male presents with a spiral fracture of the mid-shaft tibia. The examiner asks about the type of forces that typically cause such a fracture pattern. Which force is most likely responsible?





Explanation

Spiral fractures are typically caused by torsional or rotational forces applied to the bone. Direct compression tends to cause transverse or comminuted fractures. Shear forces can cause oblique fractures. Bending moments cause transverse or short oblique fractures with a butterfly fragment. Axial tension is less common in long bones but can cause avulsion fractures or distraction injuries.

Question 18

When performing a hip arthroplasty, the surgeon aims to restore native hip biomechanics. Which parameter is considered most critical to prevent impingement and dislocation?





Explanation

Cup inclination and anteversion are paramount in preventing impingement and dislocation in total hip arthroplasty. Incorrect positioning can lead to either anterior or posterior instability. While offset restoration and leg length equality are important for gait, muscle function, and patient satisfaction, and stem size/version are also critical, the orientation of the acetabular component is arguably the most critical factor for stability in isolation. Patient activity level influences risk but is not a surgical parameter.

Question 19

A candidate is discussing common ethical dilemmas in orthopedics. The examiner presents a scenario where a patient requires an urgent, limb-saving procedure but refuses due to religious beliefs. The patient has capacity. What is the most appropriate initial course of action?





Explanation

If a patient with capacity refuses treatment, even if it is limb-saving, their autonomous decision must be respected, provided they have been fully informed of the risks and benefits. Proceeding under the doctrine of necessity is only for patients who lack capacity. Seeking a court order or involving an ethics committee to override a capacitous patient's decision is generally not ethically or legally permissible. Contacting a religious leader might be done with patient permission, but the ultimate decision rests with the patient with capacity.

Question 20

Which type of research study provides the highest level of evidence for the efficacy of a new surgical technique?





Explanation

According to the hierarchy of evidence, a well-designed Randomized Controlled Trial (RCT) provides the highest level of evidence for determining the efficacy of interventions, including new surgical techniques. This is because randomization minimizes confounding and bias. Case series and expert opinions are at the bottom, while cohort and case-control studies are observational and susceptible to more biases than RCTs.

Question 21

In pediatric orthopedic assessment, which of the following signs is most indicative of developmental dysplasia of the hip (DDH) in an infant under 3 months of age?





Explanation

Limited hip abduction is the most consistent and reliable clinical sign of DDH in an infant under 3 months of age. The Ortolani and Barlow maneuvers are used to assess reducibility and dislocatability, respectively. A significant limb length discrepancy and positive Galeazzi sign (unequal knee height with hips and knees flexed) suggest a unilateral hip dislocation, but might be less evident or reliable in the very young infant. A Trendelenburg gait is seen in older children who are walking, and pain is generally not a prominent feature of DDH in infants.

Question 22

A candidate is reviewing bone metabolism. Which vitamin is essential for the absorption of calcium from the gut and for maintaining bone mineralization?





Explanation

Vitamin D is crucial for calcium homeostasis. It facilitates the absorption of calcium from the small intestine and plays a vital role in maintaining adequate serum calcium and phosphate concentrations for bone mineralization. Vitamin K is important for gamma-carboxylation of bone proteins (like osteocalcin), Vitamin C for collagen synthesis, and Vitamins A and E have other functions not directly related to calcium absorption and bone mineralization in this primary role.

Question 23

During a discussion on general principles of fracture management, the examiner asks about the purpose of open reduction and internal fixation (ORIF) in intra-articular fractures. What is the primary goal of ORIF for these fractures?





Explanation

The primary goal of ORIF for intra-articular fractures is to achieve anatomical reduction of the articular surface and stable internal fixation. This is crucial to restore joint congruity, minimize post-traumatic arthritis, and allow for early range of motion. While early weight-bearing may be a secondary benefit, it's not the primary goal and depends on the fracture and fixation stability. Preventing infection is important for any surgery but not the specific primary goal of ORIF technique. Minimizing surgical time and blood loss are general surgical principles, not specific goals of ORIF for these fractures. Early rehabilitation is facilitated by stable fixation, not eliminated.

Question 24

Which structure is most vulnerable to injury during a standard posterior approach to the hip (e.g., for total hip arthroplasty)?





Explanation

The sciatic nerve is the most vulnerable major nerve during a standard posterior approach to the hip. It lies in close proximity to the posterior aspect of the hip joint, superficial to the short external rotators (which are often detached and reattached). Care must be taken during dissection, retraction, and component placement to avoid traction or direct injury. The femoral and obturator nerves are anterior, and the gluteal nerves/vessels are more superior or anterior-superior.

Question 25

The FRCS (Tr & Orth) examination assesses a candidate's ability to manage complex cases. When discussing a case of chronic osteomyelitis, the examiner asks about the most critical component of successful treatment. What is it?





Explanation

Surgical debridement and removal of all necrotic and infected bone (sequestra) is the single most critical component in the treatment of chronic osteomyelitis. Without adequate debridement, antibiotics alone cannot penetrate the avascular tissue or eradicate biofilms effectively. While prolonged antibiotics, antibiotic-impregnated beads, and sometimes hyperbaric oxygen are important adjuncts, surgical debridement is paramount for source control. Antifungal therapy would only be relevant if a fungal infection were identified.

Question 26

A senior registrar is discussing the 'WHO Surgical Safety Checklist'. What is the primary goal of implementing this checklist?





Explanation

The primary goal of the WHO Surgical Safety Checklist is to improve patient safety by promoting effective communication and teamwork among surgical team members. It's structured into three phases (Sign In, Time Out, Sign Out) to ensure critical steps are performed, equipment is checked, and concerns are discussed. It does not aim to reduce waiting lists, standardize techniques, replace vigilance, or solely serve as a legal document.

Question 27

Regarding the pathophysiology of compartment syndrome, what is the most immediate consequence of increased interstitial pressure within a closed fascial compartment?





Explanation

In compartment syndrome, the increased interstitial pressure first compromises venous outflow and capillary perfusion because venous and capillary pressures are lower than arterial pressure. This leads to tissue ischemia, further edema, and a vicious cycle. Arterial inflow is typically maintained until very high pressures. Nerve demyelination and muscle necrosis are later consequences of prolonged ischemia. Muscle hypertrophy is unrelated, and bone necrosis is not the immediate consequence.

Question 28

Which of the following describes a Type III open fracture according to the Gustilo-Anderson classification?





Explanation

Gustilo-Anderson Type III open fractures are characterized by extensive soft tissue damage, significant periosteal stripping, and are often associated with high-energy trauma. They are further subdivided (IIIA, IIIB, IIIC). Type I is a wound less than 1 cm. Type II is a wound greater than 1 cm but without extensive soft tissue damage. Severe neurovascular injury defines Type IIIC. The timing of definitive wound closure is a management principle, not a classification criterion.

Question 29

A 60-year-old patient with osteoporosis sustains a vertebral compression fracture. Which pharmacological agent is considered the cornerstone for long-term management of osteoporosis to reduce future fracture risk?





Explanation

Bisphosphonates are considered the cornerstone of pharmacological treatment for osteoporosis, significantly reducing the risk of vertebral and non-vertebral fractures by inhibiting osteoclast activity. While calcium and vitamin D supplements are important, they are usually adjunctive to primary pharmacological therapy in established osteoporosis. NSAIDs are for pain relief. Corticosteroids exacerbate osteoporosis. SSRIs are antidepressants and unrelated to osteoporosis management.

Question 30

In the assessment of a patient with a suspected deep vein thrombosis (DVT) in the leg, which clinical assessment tool is commonly used to estimate the pre-test probability?





Explanation

The Wells' Score for DVT is a widely used clinical prediction rule to estimate the pre-test probability of a DVT, guiding further diagnostic investigations such as D-dimer testing and ultrasound. GCS is for neurological impairment, MRS for disability following stroke, APACHE II for severity of illness in ICU, and VAS (Visual Analogue Scale) for pain.

Question 31

An examiner asks about the principles of rehabilitation after major orthopedic surgery. What is the primary benefit of early, controlled range of motion exercises following an articular fracture fixation?





Explanation

Early, controlled range of motion exercises following stable fixation of articular fractures are primarily aimed at maintaining joint cartilage health (preventing chondrocyte death and matrix degradation) and preventing joint stiffness and contractures. While it can help manage swelling, its main benefit is joint preservation. Accelerating bone union requires different mechanical stimuli. It does not eliminate the need for physical therapy, and rapid muscle strength improvement is a later goal.

Question 32

Which characteristic of Staphylococcus aureus makes it particularly challenging to treat in orthopedic infections?





Explanation

Staphylococcus aureus is a major pathogen in orthopedic infections, and its ability to form biofilms on implanted materials (like prostheses or plates) is a critical factor contributing to chronicity and difficulty in treatment. Biofilms protect bacteria from antibiotics and the host immune system. S. aureus is a facultative anaerobe, grows relatively quickly, is often resistant to common antibiotics (e.g., MRSA), and is widely present in both hospital and community settings.

Question 33

When discussing surgical instrument sterilization, which method achieves the highest level of sterility, suitable for critical instruments contacting sterile tissues?





Explanation

Steam sterilization (autoclave) is the most common and effective method for achieving the highest level of sterility for critical instruments used in orthopedic surgery. It kills all microorganisms, including bacterial spores. Dry heat is also effective but requires longer exposure times. High-level disinfection and chemical immersion are typically for semi-critical or heat-sensitive instruments, and boiling is an older, less reliable method that does not kill all spores.

Question 34

A candidate is discussing common inflammatory arthropathies. Which specific HLA allele is strongly associated with ankylosing spondylitis and other spondyloarthropathies?





Explanation

HLA-B27 is strongly associated with ankylosing spondylitis, psoriatic arthritis, reactive arthritis, and inflammatory bowel disease-associated arthritis, collectively known as spondyloarthropathies. While other HLA alleles are associated with different conditions (e.g., HLA-DR4 with rheumatoid arthritis), HLA-B27 is the hallmark for spondyloarthropathies.

Question 35

In the context of the FRCS (Tr & Orth) clinical viva, what is the primary purpose of presenting a 'short case'?





Explanation

The primary purpose of a 'short case' in the FRCS clinical viva is to assess the candidate's ability to perform a focused examination, identify key clinical signs, formulate a differential diagnosis, and propose an appropriate investigation and management plan for a specific orthopedic problem (e.g., a knee pathology, a hand deformity). It is not about a complete head-to-toe exam, nor about rare conditions, nor about speed over accuracy, nor solely communication skills (though they are assessed).

Question 36

Which of the following statements about intramedullary nailing of long bone fractures is most accurate?





Explanation

Intramedullary nailing is primarily a load-sharing device that provides relative stability to long bone fractures, encouraging secondary bone healing (via callus formation). It is inserted with minimal soft tissue dissection (minimally invasive) and is particularly well-suited for diaphyseal fractures, including many comminuted patterns. It does not provide rigid absolute stability and is generally not used for articular fractures (where anatomical reduction and absolute stability are paramount).

Question 37

A candidate is asked about the definition of 'clinical governance'. Which aspect is central to this concept in healthcare?





Explanation

Clinical governance is a framework through which NHS organisations are accountable for continuously improving the quality of their services and safeguarding high standards of care. It encompasses audit, risk management, education, research, and patient involvement. It goes beyond individual accountability (which is part of it) and focuses on systemic quality improvement, not just financial solvency or waiting times, or solely error rates.

Question 38

When managing an open fracture, what is the most critical initial step to minimize the risk of infection?





Explanation

While immediate irrigation and debridement in the OR are crucial, the most critical initial step upon presentation is covering the wound with sterile dressings and administering broad-spectrum intravenous antibiotics. This prevents further contamination and starts prophylactic treatment against potential infection. Tetanus prophylaxis is important but secondary. Wound cultures are typically taken after initial debridement. NPWT is a later stage management option.

Question 39

Regarding musculoskeletal imaging, what is the primary advantage of Magnetic Resonance Imaging (MRI) over Computed Tomography (CT) for soft tissue assessment?





Explanation

The primary advantage of MRI for soft tissue assessment is its superior soft tissue contrast resolution and the absence of ionizing radiation. This makes it ideal for evaluating ligaments, tendons, menisci, cartilage, and muscle. CT is better for cortical bone and fracture details and has faster acquisition time. MRI is generally more expensive and less widely available than CT. CT is better for detecting calcifications.

Question 40

Which factor is most influential in determining the prognosis and management strategy for a patient with metastatic bone disease?





Explanation

The type and aggressiveness of the primary tumor are most influential in determining the overall prognosis and guiding the management strategy for metastatic bone disease. Different primary tumors (e.g., breast, prostate, lung, renal, thyroid) have varying biological behaviors, growth rates, responsiveness to systemic therapies, and life expectancies, which directly impact the decision-making process for orthopedic interventions. While other factors like location, pathological fracture, and age are important for local management, the primary tumor dictates the overall oncological plan.

Question 41

When assessing a patient for a potential cervical spine injury in a trauma setting, which finding necessitates immediate immobilization and further imaging, even if the patient is neurologically intact?





Explanation

Midline cervical spine tenderness, even in a neurologically intact patient, is a red flag and necessitates immediate cervical spine immobilization and further imaging (e.g., CT scan) until an injury is ruled out. This is a critical principle in ATLS and spinal trauma assessment. Scalp lacerations or headaches are non-specific. Extremity paresthesia suggests neurological involvement and definitely requires attention, but midline tenderness alone in an 'intact' patient (meaning no obvious neurological deficit yet) is a crucial sign for initial management. A clavicle fracture is a separate injury.

Question 42

A candidate is asked about the 'stress shielding' phenomenon in orthopedic implants. Which statement best describes this concept?





Explanation

Stress shielding occurs when an orthopedic implant carries a large proportion of the mechanical load, 'shielding' the adjacent bone from its normal physiological stress. According to Wolff's Law, bone remodels in response to mechanical stress. When bone is shielded from stress, it responds by resorbing and atrophying, leading to decreased bone density around the implant. This can potentially compromise implant longevity or lead to periprosthetic fracture.

Question 43

Which of the following describes the purpose of 'locking plates' in fracture fixation?





Explanation

Locking plates function as internal fixators, creating an angular stable construct. The screws lock into the plate, providing a fixed-angle device that does not rely on plate-bone compression for stability. This allows them to effectively 'splint' the fracture, preserving periosteal blood supply and promoting relative stability and secondary bone healing. They do not provide absolute stability through compression (that's conventional plating) and don't necessarily facilitate early full weight-bearing in all patterns. They are suitable for comminuted fractures or osteoporotic bone.

Question 44

In the context of musculoskeletal pharmacology, which class of antibiotics is absolutely contraindicated in children due to the risk of cartilage damage?





Explanation

Fluoroquinolones (e.g., ciprofloxacin, levofloxacin) are generally contraindicated in children due to the risk of damage to growing cartilage, specifically arthropathy. While they may be used in exceptional, life-threatening circumstances where no other effective alternative exists, their routine use is avoided. Tetracyclines are avoided due to dental staining and bone growth inhibition in young children, but the specific cartilage damage risk makes fluoroquinolones particularly noteworthy in orthopedics. Penicillins, cephalosporins, and macrolides are commonly used in pediatric infections.

Question 45

Which imaging modality is considered the 'gold standard' for diagnosing a stress fracture in its early stages when plain radiographs are often normal?





Explanation

MRI is considered the 'gold standard' for early diagnosis of stress fractures. It can detect bone marrow edema, periosteal reaction, and early fracture lines before they are visible on plain radiographs or even CT scans. Bone scintigraphy is very sensitive but lacks specificity. Plain X-rays are often normal in early stress fractures. CT can show cortical changes but is less sensitive than MRI for early marrow changes. Ultrasound has limited utility for bone stress injuries.

Question 46

A candidate is asked about common pitfalls in the management of open fractures. Which statement highlights a critical error in initial management?





Explanation

Delaying the administration of broad-spectrum intravenous antibiotics is a critical error in the initial management of open fractures, as early antibiotic therapy significantly reduces the risk of infection. While copious irrigation and debridement are crucial, the antibiotics should be given as soon as possible after presentation. Topical antiseptics are generally avoided in open wounds. Skeletal stabilization and wound care should ideally occur concurrently or wound care slightly precede definitive fixation. Definitive wound closure within 48 hours (or sooner) is a management goal, not necessarily an error if delayed by patient factors.

Question 47

The concept of 'tension band plating' is discussed. What is the primary biomechanical principle behind its effectiveness in fracture fixation?





Explanation

Tension band plating is based on the principle of converting tensile forces into compressive forces at the fracture site. By applying a plate to the tension side of a bone (e.g., anterior aspect of the femur with a transverse fracture), distraction forces during loading are resisted, creating compression across the fracture. This provides relative stability and promotes healing. It does not provide absolute stability in the same way as interfragmentary compression, nor does it typically allow controlled micromotion (unless designed for dynamic stabilization).

Question 48

When obtaining informed consent for surgery, a patient expresses concern about the potential for severe pain. What is the most appropriate ethical and practical response?





Explanation

The most appropriate response is to provide a detailed, honest discussion about expected post-operative pain, available pain management strategies (e.g., multimodal analgesia, regional blocks), and potential complications like chronic pain. This respects patient autonomy, addresses their concerns, and ensures they are fully informed. Assuring complete pain elimination is unrealistic and misleading. Brief mention is inadequate. Delegating the discussion abdicates the surgeon's responsibility. Delaying surgery may be an option but doesn't address the core issue of informing the patient.

Question 49

In the context of the FRCS (Tr & Orth) exam, what is the significance of understanding basic statistics, such as 'p-value' and 'confidence interval'?





Explanation

Understanding basic statistics, including p-values and confidence intervals, is crucial for critically appraising scientific literature. This allows FRCS candidates to interpret research findings, assess the validity and generalizability of studies, and apply evidence-based principles to clinical practice. It is not about performing complex analyses or designing trials, nor is it primarily for impressing examiners or real-time calculations, but for informed decision-making based on evidence.

Question 50

Which of the following describes the anatomical structure primarily responsible for resisting valgus stress at the knee joint?





Explanation

The Medial Collateral Ligament (MCL) is the primary static stabilizer that resists valgus stress (forces pushing the knee inward) at the knee joint. The LCL resists varus stress. The ACL resists anterior translation of the tibia, and the PCL resists posterior translation. The popliteus tendon has a role in posterolateral stability and external rotation but is not the primary valgus restraint.

Question 51

A junior trainee is asked about 'audit' in clinical practice. What is the fundamental difference between clinical audit and research?





Explanation

The fundamental difference is their aim. Clinical audit compares current practice against established standards or guidelines to identify areas for improvement within a service. Research, conversely, aims to discover new knowledge, test hypotheses, or investigate new treatments or theories. Ethical approval is almost always required for research, and often for audit, particularly if it involves patient identifiable data beyond routine care. Neither are always generalizable, and audit is about quality, not primarily financial efficiency.

Question 52

Which type of shock is most commonly encountered in a patient with a pelvic ring fracture and significant retroperitoneal hemorrhage?





Explanation

A pelvic ring fracture with significant retroperitoneal hemorrhage typically causes hypovolemic shock. The retroperitoneal space can accommodate a large volume of blood (several liters), leading to substantial blood loss and subsequent reduction in circulating blood volume. Cardiogenic shock is due to pump failure, obstructive shock from mechanical obstruction (e.g., tension pneumothorax), distributive shock from vasodilation (e.g., sepsis), and neurogenic shock from spinal cord injury (loss of sympathetic tone).

Question 53

The concept of 'load sharing' is crucial in the biomechanics of fracture fixation. Which of the following fixation constructs best exemplifies the principle of load sharing?





Explanation

An intramedullary nail for a diaphyseal fracture is the best example of a load-sharing device. It shares the axial load with the bone, allowing controlled stress transfer that promotes callus formation and secondary bone healing. A lag screw provides interfragmentary compression (absolute stability). A compression plate also provides absolute stability. An external fixator, depending on its configuration, can be load-sharing but an intramedullary nail is the classic example in internal fixation. A cast is external and does not share load in the same biomechanical way as an IM nail.

Question 54

In surgical theatre protocols, what is the primary purpose of prophylactic antibiotic administration before orthopedic surgery?





Explanation

The primary purpose of prophylactic antibiotics is to reduce the bacterial load at the surgical site during the procedure, specifically during the period of maximal contamination (e.g., incision, exposure of deep tissues). This minimizes the chance of bacteria overwhelming the host defenses and causing an infection. They do not treat existing infections (that's therapeutic antibiotics), do not sterilize the site, do not prevent all infections, and are an adjunct to, not a replacement for, meticulous aseptic technique.

Question 55

Which of the following is an example of a 'quality improvement' initiative in an orthopedic department?





Explanation

Auditing compliance with a pre-operative DVT prophylaxis protocol is a classic example of a quality improvement (QI) initiative. QI focuses on systematically improving patient care processes and outcomes within an existing service. A randomized controlled trial is research. A case report is descriptive research/learning. Developing a new technique is innovation. Attending a conference is professional development. Audit directly measures performance against standards with the intent to improve.

Question 56

A candidate is asked about the 'three-column concept' of spinal stability. Which column is primarily responsible for resisting axial compression and is often compromised in burst fractures?





Explanation

The Denis three-column concept divides the spine into anterior, middle, and posterior columns. The middle column, comprising the posterior half of the vertebral body, the posterior annulus fibrosus, and the posterior longitudinal ligament, is crucial for resisting axial compression. Its compromise, especially in burst fractures where bone fragments retropulse into the spinal canal, signifies instability and potential neurological risk. The anterior column consists of the anterior longitudinal ligament and the anterior half of the vertebral body. The posterior column consists of the pedicles, laminae, facet joints, and posterior ligamentous complex. There is no 'lateral' or 'neural' column in this classification.

Question 57

In the Basic Science viva, an examiner asks about the optimization of Ultra-High Molecular Weight Polyethylene (UHMWPE) for total hip arthroplasty. Which of the following sterilization methods maximizes cross-linking while minimizing oxidative degradation?





Explanation

Gamma irradiation induces cross-linking, which improves wear resistance but generates free radicals. Performing this in an inert environment (argon or vacuum) and subsequently remelting or annealing eliminates free radicals, minimizing oxidative degradation.

Question 58

During a Trauma viva, you are presented with a hemodynamically unstable patient with an Antero-Posterior Compression (APC) Type III pelvic injury. According to BOAST guidelines, what is the most appropriate initial mechanical intervention?





Explanation

A pelvic binder provides rapid, non-invasive hemorrhage control by reducing pelvic volume. It must be centered over the greater trochanters to effectively close the pelvic ring, as placement over the iliac crests can worsen the deformity.

Question 59

A 12-year-old boy presents with an acute-on-chronic slipped upper femoral epiphysis (SUFE). He is unable to weight-bear even with crutches. According to the Loder classification, what is his primary risk regarding complications?





Explanation

Inability to weight-bear defines an unstable SUFE in the Loder classification. Unstable slips carry a high risk of avascular necrosis (typically 20-47%), significantly altering the prognosis compared to stable slips.

Question 60

In an Adult Pathology viva, you are asked about Periprosthetic Joint Infection (PJI). According to the 2018 International Consensus Meeting (ICM) criteria, which of the following is considered a major criterion for diagnosing PJI?





Explanation

The ICM major criteria for PJI are the presence of a sinus tract communicating with the prosthesis or two positive tissue/fluid cultures isolating the same organism. Minor criteria include elevated inflammatory markers and synovial white cell counts.

Question 61

A candidate is asked about the biomechanics of flexor tendon repairs in the hand. Which of the following modifications most significantly increases the tensile strength of a primary Zone 2 flexor tendon repair?





Explanation

The ultimate tensile strength of a tendon repair is directly proportional to the number of core suture strands crossing the repair site. Adding an epitendinous suture also increases strength and smooths the repair, reducing gliding resistance.

Question 62

During a discussion on fracture fixation principles (Perren's Strain Theory), the examiner asks what level of interfragmentary strain is required to promote primary (direct) bone healing without callus formation. What is the correct threshold?





Explanation

Primary bone healing occurs via cutting cones and requires absolute stability. According to Perren's strain theory, this requires an interfragmentary strain of less than 2%, typically achieved with compression plating or lag screws.

Question 63

A 35-year-old obtunded patient with a tibial shaft fracture is suspected of having acute compartment syndrome. Intracompartment syndrome. What is the universally accepted threshold for diagnosing compartment syndrome using intracompartmental pressure monitoring?





Explanation

Diagnosis in an obtunded patient relies on continuous or repeated intracompartmental pressure measurements. A delta pressure (Diastolic BP - Compartment Pressure) of less than 30 mmHg is highly indicative of acute compartment syndrome.

Question 64

An infant is undergoing treatment for Developmental Dysplasia of the Hip (DDH) using a Pavlik harness. During a follow-up, you notice decreased active knee extension on the affected side. What is the most likely cause of this complication?





Explanation

Decreased active knee extension indicates a femoral nerve palsy, the most common nerve injury associated with the Pavlik harness. It is caused by hyperflexion of the hip and usually resolves upon adjusting the anterior straps.

Question 65

In a Professionalism and Ethics viva, the examiner asks about the 'Duty of Candour'. If a 'Never Event' occurs, such as wrong-site surgery, what is the most appropriate first action towards the patient?





Explanation

The statutory duty of candour requires healthcare professionals to be open and honest with patients when things go wrong. The immediate step is to inform the patient, apologize, and explain the known facts.

Question 66

You are discussing the 'terrible triad' of the elbow in a Trauma viva. Which of the following best represents the standard surgical sequence for reconstructing this injury pattern?





Explanation

The standard surgical algorithm for a terrible triad (coronoid fracture, radial head fracture, elbow dislocation) restores stability from deep to superficial: fix the coronoid, fix/replace the radial head, then repair the LCL. The MCL is only repaired if the elbow remains unstable.

Question 67

An examiner asks about prophylactic fixation of impending pathological fractures in metastatic bone disease. Which of the following parameters is NOT part of the Mirels' scoring system?





Explanation

Mirels' criteria are used to predict the risk of pathological fracture and guide prophylactic fixation. The score relies on the site, size, nature (lytic/blastic), and pain level, but does not include the primary tumor's specific histological type.

Question 68

During a Basic Science viva on articular cartilage, the examiner asks about the structural organization of collagen. In the deep zone of articular cartilage, how are the collagen fibers predominantly oriented relative to the articular surface?





Explanation

In the deep zone, collagen fibers (primarily Type II) are oriented perpendicularly to the articular surface. This arrangement allows them to cross the tidemark and firmly anchor the uncalcified cartilage to the underlying calcified cartilage and subchondral bone.

Question 69

A candidate is asked about clinical tests for ulnar nerve compression (cubital tunnel syndrome). The examiner asks what muscle weakness produces a positive Froment's sign. Which muscle is primarily affected?





Explanation

A positive Froment's sign occurs due to weakness of the adductor pollicis (innervated by the ulnar nerve). The patient compensates by using the flexor pollicis longus (median nerve) to pinch, resulting in hyperflexion of the thumb interphalangeal joint.

Question 70

In a Paediatric Trauma scenario, a 6-year-old presents with a Gartland Type III supracondylar humeral fracture. The hand is pink but pulseless. Following closed reduction and percutaneous pinning, the hand remains pink and pulseless. What is the most appropriate next step?





Explanation

For a 'pink, pulseless' hand after satisfactory reduction and stabilization of a paediatric supracondylar fracture, the standard protocol is close observation. Collateral circulation is adequate for tissue viability, and the pulse often returns within 24-48 hours.

Question 71

During a surgical approaches viva, you are asked about the anterior (Smith-Petersen) approach to the hip. What is the internervous plane utilized in the superficial dissection of this approach?





Explanation

The superficial internervous plane for the Smith-Petersen approach is between the Sartorius (innervated by the femoral nerve) and the Tensor Fasciae Latae (innervated by the superior gluteal nerve). This preserves the neurovascular supply to both muscles.

Question 72

You are discussing anterior cruciate ligament (ACL) reconstruction. When comparing Bone-Patellar Tendon-Bone (BPTB) autografts to Hamstring autografts, which of the following is a recognized disadvantage specific to the BPTB graft?





Explanation

BPTB autografts are associated with a higher incidence of donor site morbidity, specifically anterior knee pain and discomfort while kneeling. However, they offer rigid bone-to-bone healing and excellent initial stability.

Question 73

A patient presents with an open tibial fracture. According to the Gustilo-Anderson classification, the wound is 12 cm long, with extensive periosteal stripping and requires a rotational muscle flap for coverage. Which classification grade is this?





Explanation

Gustilo-Anderson Type IIIB fractures involve extensive soft tissue injury with periosteal stripping and exposed bone requiring flap coverage (local or free). Type IIIA allows for primary closure without a flap, and Type IIIC indicates an arterial injury requiring repair.

Question 74

During a viva on informed consent, the examiner asks about the 'Montgomery v Lanarkshire Health Board' Supreme Court ruling. How did this case change the legal standard for informed consent in the UK?





Explanation

The 2015 Montgomery ruling marked a shift toward patient-centered care. It established that doctors must disclose 'material risks'—those to which a reasonable person in the patient's position would attach significance—effectively overturning the Bolam test for consent.

Question 75

In evaluating a patient with Cauda Equina Syndrome (CES), the examiner asks for the distinction between CES-I (Incomplete) and CES-R (With Retention). What is the defining clinical feature of CES-R?





Explanation

CES-R (Retention) is characterized by painless urinary retention and overflow incontinence, indicating complete loss of executive bladder control. CES-I (Incomplete) involves altered urinary sensation or poor stream but preserves voluntary control.

Question 76

An examiner questions you on screw biomechanics. You are asked how to maximize the pull-out strength of a cortical screw in osteoporotic bone. Which of the following design alterations most significantly increases pull-out strength?





Explanation

Pull-out strength is directly proportional to the volume of bone caught between threads. It is maximized by increasing the outer diameter of the threads, decreasing the core diameter, and decreasing the pitch (more threads per unit length).

Question 77

A 13-year-old obese boy presents with an acute-on-chronic exacerbation of groin pain and an inability to bear weight. Radiographs confirm an unstable slipped capital femoral epiphysis (SCFE). Which of the following complications has the highest incidence following surgical management of this specific injury pattern?





Explanation

Unstable SCFE, defined clinically by an inability to bear weight, carries a high risk of avascular necrosis (up to 47%). Urgent decompression and stabilization are debated, but the AVN risk remains inherently tied to the initial vascular insult of the unstable slip.

Question 78

In total hip arthroplasty, the use of highly cross-linked ultra-high-molecular-weight polyethylene (UHMWPE) reduces wear primarily by altering its material properties. Which of the following best describes the trade-off of increasing cross-linking in UHMWPE?





Explanation

Highly cross-linked polyethylene significantly improves wear resistance but compromises mechanical properties such as fatigue strength, ductility, and fracture toughness. This trade-off must be considered, especially when using thin liners in younger, more active patients.

Question 79

According to the British Orthopaedic Association Standards for Trauma (BOAST) guidelines for open fractures, when should definitive soft tissue coverage ideally be achieved for a Gustilo-Anderson Grade IIIB tibial diaphyseal fracture?





Explanation

BOAST guidelines recommend that definitive skeletal fixation and soft tissue coverage for open tibial fractures should ideally be performed within 72 hours. Delayed coverage beyond this timeframe significantly increases the risk of deep infection.

Question 80

A 42-year-old male presents with bilateral sciatica, saddle anesthesia, and urinary retention. MRI reveals a massive L4/L5 central disc herniation. What is the primary pathophysiological mechanism underlying cauda equina syndrome in this setting?





Explanation

The primary mechanism of nerve root injury in cauda equina syndrome is venous congestion leading to localized edema and secondary ischemia. The nerve roots of the cauda equina lack a robust epineurium, making them highly susceptible to mechanical compression.

Question 81

A 68-year-old woman presents with acute onset knee pain, swelling, and erythema 3 weeks after an uncomplicated total knee arthroplasty. Her CRP is 180 mg/L. Joint aspirate yields turbid fluid with 65,000 WBCs/mcL (90% neutrophils). Which of the following is the most appropriate initial management?





Explanation

For acute periprosthetic joint infections occurring within 4 weeks of index surgery, Debridement, Antibiotics, and Implant Retention (DAIR) with modular component exchange is the treatment of choice. This provides a balance of eradicating infection while minimizing the morbidity of a full revision.

Question 82

A 25-year-old carpenter sustains a laceration to the volar aspect of his proximal phalanx (Zone II), cleanly severing both the FDS and FDP tendons. What is the optimal surgical repair construct to maximize tensile strength and minimize gap formation during early active rehabilitation?





Explanation

A 4-strand core suture supplemented by a running epitendinous suture provides sufficient tensile strength for early active motion protocols while minimizing tendon bulk. The epitendinous suture significantly reduces gap formation and improves the gliding characteristics.

Question 83

An examiner in the Basic Science viva asks about the biomechanical principles of fracture fixation. Which of the following statements best describes the mechanical advantage of a locking compression plate (LCP) over a conventional dynamic compression plate (DCP)?





Explanation

Locking plates function as fixed-angle single-beam constructs because the screw heads thread directly into the plate. This eliminates the need for plate-to-bone friction, preserving periosteal blood supply and providing superior hold in osteoporotic bone.

Question 84

A 30-year-old motorcyclist is brought into the resus room with a hemodynamically unstable pelvic ring injury. A pelvic binder is applied. To achieve optimal mechanical closure of the pelvic volume, where should the binder be centered?





Explanation

A pelvic binder must be applied centered precisely over the greater trochanters to effectively reduce pelvic volume and stabilize the fracture. Application over the iliac crests is ineffective and can inadvertently open the pelvic ring further in some fracture patterns.

Question 85

A 72-year-old female with massive, irreparable rotator cuff arthropathy and pseudoparalysis of the shoulder undergoes a reverse total shoulder arthroplasty (RTSA). Which biomechanical alteration is responsible for restoring her active forward elevation?





Explanation

RTSA medializes and inferiorly translates the center of rotation of the glenohumeral joint. This increases the lever arm and resting tension of the deltoid, allowing it to initiate and maintain forward elevation even in the absence of a functional rotator cuff.

Question 86

A 6-month-old infant is diagnosed with a delayed presentation of developmental dysplasia of the hip (DDH). Ultrasound confirms a completely dislocated but reducible hip. What is the most appropriate initial management step?





Explanation

For a reducible DDH at 6 months of age, closed reduction under general anesthesia (often with an arthrogram) followed by spica casting is the standard of care. A Pavlik harness is generally ineffective and poorly tolerated after 6 months of age.

Question 87

A 28-year-old male suffers a comminuted tibial diaphyseal fracture. Six hours post-intramedullary nailing, he complains of severe pain resistant to opioids. On examination, there is pain with passive stretch of the hallux. Which delta pressure (diastolic blood pressure minus intracompartmental pressure) is considered the threshold for diagnosing acute compartment syndrome?





Explanation

A delta pressure (diastolic BP minus intracompartmental pressure) of less than 30 mmHg is the widely accepted clinical threshold for diagnosing acute compartment syndrome. Absolute pressure readings are less reliable due to natural variations in systemic blood pressure.

Question 88

A 55-year-old diabetic male presents with a swollen, warm, and erythematous left foot. Radiographs reveal fragmentation of the tarsometatarsal joints, subchondral cysts, and periarticular debris. He is diagnosed with acute Charcot arthropathy (Eichenholtz Stage 1). What is the gold standard initial treatment?





Explanation

The gold standard initial management for acute phase (Eichenholtz Stage 1) Charcot arthropathy is strict immobilization and offloading using a total contact cast. Surgical intervention during the acute, inflammatory phase is associated with high failure and complication rates.

Question 89

An examiner questions you on diagnostic tests. A new clinical test for diagnosing scaphoid fractures has a high positive predictive value (PPV). Which of the following epidemiological factors will most directly cause the PPV of this test to increase?





Explanation

Positive predictive value is highly dependent on the prevalence of the disease in the tested population. As disease prevalence increases, the likelihood that a positive test truly represents the disease (PPV) also increases, assuming sensitivity and specificity remain constant.

Question 90

A 35-year-old male sustains a closed fracture of the middle third of the humeral shaft. Following closed reduction and application of a U-slab, he develops a new-onset complete radial nerve palsy. What is the most appropriate management?





Explanation

While primary radial nerve palsies associated with closed humerus fractures are usually observed, a secondary palsy that develops after a manipulation or reduction attempt strongly indicates nerve entrapment at the fracture site. This warrants immediate surgical exploration.

Question 91

During a total knee arthroplasty for a severe valgus deformity, you find that the lateral structures remain tight in extension after bone cuts. Which of the following structures should be released first to correct the valgus deformity in extension?





Explanation

In a valgus knee, the iliotibial (IT) band is the primary tether to correction in extension. Sequential release of the lateral structures typically begins with the IT band (or lateral capsule), followed by the popliteus, and then the LCL if necessary.

Question 92

In a viva on orthopedic biomaterials, an examiner asks about the consequences of combining different metals in an implant construct. If a 316L stainless steel screw is placed through a titanium alloy plate in a physiologic environment, what is the most likely outcome based on the galvanic series?





Explanation

In a galvanic couple, the less noble (more anodic) metal undergoes accelerated corrosion. Stainless steel is more anodic than titanium alloy, making the stainless steel screw susceptible to accelerated galvanic corrosion in the physiologic electrolyte environment.

Question 93

During a trauma viva, you are presented with a 25-year-old intubated and ventilated polytrauma patient who has an isolated closed tibial shaft fracture. The leg is tense, pale, and pulseless. You diagnose acute compartment syndrome. Regarding consent and immediate management, what is the most appropriate next step under UK law (Mental Capacity Act) and FRCS principles?





Explanation

Under the Mental Capacity Act, if an adult lacks capacity and faces an immediate threat to life or limb, emergency treatment must proceed in their best interests without delay. Next-of-kin cannot legally consent on behalf of an adult in the UK, though they should be consulted if time permits.

Question 94

In the adult elective orthopedics viva, you are shown a radiograph of a 45-year-old patient who underwent a total hip arthroplasty with a ceramic-on-ceramic bearing. They now complain of a new-onset squeaking noise when walking. Which of the following factors is most strongly associated with this phenomenon?





Explanation

Squeaking in ceramic-on-ceramic total hip arthroplasty is strongly associated with edge loading, often due to component malposition such as excessive cup steepness or anteversion. This leads to stripe wear and disruption of the fluid film lubrication.

Question 95

A paediatric orthopaedic viva scenario involves a 6-year-old boy with a heavily displaced, extension-type supracondylar fracture of the humerus. On examination, he is unable to flex the interphalangeal joint of his thumb and the distal interphalangeal joint of his index finger. Which specific nerve branch is injured, and what is the typical prognosis?





Explanation

The anterior interosseous nerve (AIN), a branch of the median nerve, is the most commonly injured nerve in extension-type supracondylar fractures. It presents with the inability to make an "OK" sign, and the vast majority resolve spontaneously within 3 to 6 months without surgical exploration.

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Detailed Chapters & Topics

Dive deeper into specialized chapters regarding frcs-introduction

7 Chapters
01
Chapter 1 53 min

Ace FRCS Orthopaedics: Oxford University Press Adult Pathology Viva

Master the FRCS Orthopaedics exam with Dr. Mohammed Hutaif's expert guide to the Oxford University Press Adult Patholog…

02
Chapter 2 41 min

Ace Your FRCS: Key Questions in Trauma & Orthopaedics

Questions in Trauma and Orthopaedics for the FRCS Section 6 Lower Limb and Pelvic Trauma Viva 41 This 27-year-old has b…

03
Chapter 3 11 min

Pass Your FRCS (Tr & Orth) Examination: Essential Guidance

The FrCS (Tr & Orth) examination General guidance The FRCS Orth examination is generally considered to be fair although…

04
Chapter 4 79 min

Orthopedic Board Exam Prep: Advanced MCQ Engine for FRCS (Tr & Orth) Success

Ace your FRCS (Tr & Orth) exams with our advanced Orthopedic Board Prep MCQ engine. Enjoy study and exam modes, live sc…

05
Chapter 5 4 min

Orthopedic Viva Exam Guide: Carpal Tunnel Syndrome & Wrist Pathology

Ace your orthopedic viva exam with Dr. Mohammed Hutaif's expert guide on carpal tunnel syndrome and wrist pathology. Ma…

06
Chapter 6 113 min

FRCS Exam Success: Why Orthopedic Moment of Inertia Matters

Orthopedics Concepts Orthopedics Concepts Figure 1: With the open-second nail there is reversion of the direction of to…

07
Chapter 7 81 min

Master the Process of Fracture Healing: FRCS Exam Prep

Prepare for your FRCS exam with our interactive Ortho Board Prep. Master the fracture healing process using timed MCQ e…

Dr. Mohammed Hutaif
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