Orthopedic Anatomy Review | Dr Hutaif Basic Science Rev -...

During a posterolateral corner reconstruction of the knee, understanding the exact anatomic footprint on the fibular head is crucial. What is the relationship of the lateral collateral ligament (LCL) footprint to the popliteofibular ligament (PFL) footprint on the fibular head?

A 45-year-old overhead athlete presents with posterior shoulder pain and selective weakness in external rotation. Abduction strength is intact. MRI reveals a paralabral cyst. In which anatomic location is the cyst most likely compressing the suprascapular nerve, and what are its borders?

A patient sustains a deep laceration to the mid-palm, resulting in pulsatile bleeding from the deep palmar arch. Anatomically, the deep palmar arch is primarily formed by the terminal continuation of the radial artery. How does the radial artery anatomically enter the deep palm to form this arch?

When performing a surgical dislocation of the hip, the medial femoral circumflex artery (MFCA) must be protected to prevent avascular necrosis of the femoral head. Which of the following best describes the anatomic course of the deep branch of the MFCA?

During a plantar approach to the midfoot for an excision of a plantar fibroma, the surgeon identifies the 'Master Knot of Henry'. Which of the following anatomic relationships correctly defines this surgical landmark?

A surgeon is planning a posterior C1-C2 fusion using transarticular screws. Preoperative CTA is obtained to evaluate the vertebral artery. Anatomically, the vertebral artery typically enters the transverse foramen at which cervical level, and what percentage of the population has an anomalous entry?

A 30-year-old bodybuilder presents with poorly localized posterior shoulder pain and paresthesias over the lateral deltoid. He is diagnosed with quadrilateral space syndrome. Which vascular structure passes through this anatomical space alongside the axillary nerve?

During the anterior intrapelvic (modified Stoppa) approach for an acetabular fracture, an aberrant vascular anastomosis known as the 'corona mortis' is encountered draped over the superior pubic ramus. This vessel represents an anastomosis between the obturator vessels and which of the following?

A patient complains of medial knee and leg pain following a medial unicompartmental knee arthroplasty. Entrapment or iatrogenic injury of the saphenous nerve is suspected. Anatomically, how does the saphenous nerve exit the adductor (Hunter's) canal?

A surgeon is performing an anterior (Henry) approach to the proximal radius. To safely expose the proximal third of the radius, the supinator muscle must be elevated. The posterior interosseous nerve (PIN) runs through the supinator. The proximal fibrous edge of the superficial head of the supinator is anatomically known as:

During a submuscular transposition of the ulnar nerve, the surgeon must ensure all potential sites of compression are released. Which of the following structures is NOT a recognized site of ulnar nerve compression around the elbow?

In evaluating a high ankle sprain, a surgeon assesses the tibiofibular syndesmosis. Which ligament is the primary restraint to anterior translation of the distal fibula relative to the tibia?

The high nonunion rate of proximal pole scaphoid fractures is largely due to its precarious blood supply. The major blood supply to the scaphoid is derived from the radial artery. Where do these primary vessels anatomically enter the scaphoid bone?

A 35-year-old male sustains a spiral fracture of the middle third of the humerus (Holstein-Lewis fracture). He presents with a wrist drop. The radial nerve is closely associated with the posterior humerus. Approximately how far proximal to the lateral epicondyle does the radial nerve pierce the lateral intermuscular septum to enter the anterior compartment of the arm?

A hand surgeon is treating a severe flexor tendon laceration in zone II. During the repair, it is essential to reconstruct the tendon sheath to prevent bowstringing. Which two annular pulleys are the most mechanically critical and must be preserved or reconstructed?

When reconstructing the coracoclavicular (CC) ligaments for a chronic acromioclavicular (AC) joint dislocation, anatomic graft placement is crucial. Which of the following accurately describes the anatomic insertions of the native CC ligaments on the undersurface of the clavicle?

The anterior cruciate ligament (ACL) is composed of the anteromedial (AM) and posterolateral (PL) bundles. During biomechanical testing, which of the following accurately describes the tensioning pattern of these bundles?

A patient presents with classic signs of piriformis syndrome, including buttock pain and sciatic radiculopathy that worsens with prolonged sitting. Anatomical variations in the relationship between the sciatic nerve and the piriformis muscle can predispose to this condition. According to Beaton and Anson classification, what is the most common variant (excluding the normal anatomy)?

A 24-year-old football player sustains a hyper-plantarflexion injury to his midfoot. Radiographs show widening of the space between the first and second metatarsals. The Lisfranc ligament is injured. Between which two osseous structures does the primary Lisfranc ligament span?

A spine surgeon is performing a lateral lumbar interbody fusion (LLIF) at L4-L5. The retractor must be passed through the psoas major muscle. Which of the following best describes the anatomical location of the lumbar plexus, specifically the femoral nerve, within the psoas major at the L4-L5 disc space level?

During a posterior approach to the shoulder (Judson approach) for the treatment of a posterior glenoid fracture, the surgeon develops the primary internervous plane. Which of the following defines the muscles and their respective innervations that form this boundary?

In the ilioinguinal approach to the acetabulum, three distinct 'windows' are utilized for access. Which of the following anatomic structures must be incised to gain access to the true pelvis and strictly divides the lateral window from the middle window?

When performing a direct lateral (Hardinge) approach to the hip, the anterior portion of the gluteus medius and minimus is split. To minimize the risk of denervating the remaining anterior portion of the gluteus medius, the proximal split should not extend beyond what distance from the tip of the greater trochanter?

The deep palmar arch of the hand is a crucial collateral circulatory pathway. It is formed primarily by the terminal part of the radial artery. Which structure most commonly anastomoses with it to complete the arch?

During a posterolateral approach (Kocher) to the radial head for an ORIF of a type III fracture, the surgeon dissects between two muscle bellies to reach the joint capsule. What is the correct internervous plane for this approach?

During surgical reconstruction of the posterolateral corner (PLC) of the knee, careful dissection must be carried out around the lateral collateral ligament (LCL). Which vascular structure courses horizontally and immediately deep to the LCL at the level of the joint line and must be protected?

When tracing the path of the vertebral artery through the cervical spine, it typically ascends and enters the transverse foramen at which cervical vertebral level?

The adductor canal (Hunter's canal) serves as a passageway for structures moving from the anterior thigh to the popliteal fossa. Which nerve exits the canal by directly piercing its roof (the vastoadductor membrane)?

An orthopedic surgeon is planning an anterolateral approach to the distal tibia for a pilon fracture. To protect the superficial peroneal nerve (SPN) during the superficial dissection, the surgeon must be aware of its anatomic course. On average, at what distance proximal to the lateral malleolus does the SPN pierce the crural fascia to become subcutaneous?

The posterior aspect of the shoulder contains several defined anatomic spaces through which neurovascular structures pass. Which structure passes through the triangular space?

During a medial surgical approach to the midfoot, a dense fibrous connection is encountered on the plantar aspect beneath the navicular, known as the 'Master Knot of Henry'. Which two tendons cross at this specific anatomic landmark?

In the deep compartments of the hand, the deep palmar space is anatomically divided into the thenar space and the midpalmar space. Which structure physically separates these two deep fascial spaces?

When planning a lateral plate osteosynthesis for a distal third humerus fracture, the surgeon must identify the radial nerve as it transitions compartments. At what average distance proximal to the lateral epicondyle does the radial nerve pierce the lateral intermuscular septum to enter the anterior compartment of the arm?

During preoperative planning for posterior spinal instrumentation in the lumbar spine, morphometric assessment of the pedicles is essential. In a typical patient, which lumbar vertebra possesses the largest transverse pedicle diameter?

A trauma surgeon is using the Stoppa approach for an acetabular fracture. To avoid catastrophic bleeding, the 'corona mortis' must be identified and ligated. This vascular anastomosis crosses the superior pubic ramus at what average distance laterally from the symphysis pubis?

A surgeon is performing a posteromedial exposure of the ankle for a medial malleolus fracture with significant comminution extending posteriorly. From anterior to posterior (starting immediately posterior to the medial malleolus), what is the correct anatomical order of the structures within the tarsal tunnel?

During a posterior approach to the hip (Moore/Southern) for an elective arthroplasty, preserving the deep branch of the medial circumflex femoral artery (MCFA) is critical if avoiding avascular necrosis is desired (e.g., in tumor or trauma, or preserving anatomy). Which of the following short external rotators anatomically protects the MCFA when left intact?

A patient is evaluated for weakness in making an 'OK' sign, demonstrating an inability to flex the interphalangeal joint of the thumb and the distal interphalangeal joint of the index finger. The injured nerve is ultimately derived from which cord(s) of the brachial plexus?

The menisci of the knee have distinct attachments that dictate their mobility and susceptibility to injury. Which of the following ligaments connects the anterior horn of the medial meniscus directly to the anterior horn of the lateral meniscus?

The posterior compartment of the forearm is divided into a superficial, a mobile wad, and a deep layer. Which of the following muscles is NOT found in the deep layer of the posterior forearm?

During a total hip arthroplasty, a screw is inadvertently placed outside the safe zone in the anterosuperior quadrant of the acetabulum. Which of the following structures is at the highest risk of injury?

A 28-year-old overhead athlete presents with posterior shoulder pain and deltoid weakness. MRI reveals a paralabral cyst compressing a nerve within the quadrangular space. Which vascular structure runs alongside the affected nerve in this space?

The plantar calcaneonavicular ligament (spring ligament) is a crucial static stabilizer of the medial longitudinal arch. Which of the following structures is considered its primary medial dynamic augment?

Which of the following structures is considered the primary restraint to external rotation of the tibia at 30 degrees of knee flexion?

During a wide surgical release for an aggressive tendon sheath infection in the hand, multiple flexor pulleys are encountered. Which combination of pulleys is considered biomechanically most critical to prevent bowstringing of the flexor tendons and must be preserved?

When preparing the entry point for a thoracic pedicle screw, the standard anatomic landmark is best described as the intersection of the:

The Triangular Fibrocartilage Complex (TFCC) is the primary stabilizer of the distal radioulnar joint (DRUJ). Which specific component of the TFCC is the primary restraint to dorsal and volar translation of the radius relative to the ulna?

The distal tibiofibular syndesmosis relies on several ligaments for stability. Which of the following ligaments provides the greatest resistance to diastasis (accounts for the greatest percentage of syndesmotic strength)?

The coracoclavicular (CC) ligaments are key stabilizers of the acromioclavicular joint. Which of the following best describes their anatomic orientation and primary biomechanical functions?

Following a scaphoid waist fracture, the proximal pole is at high risk for avascular necrosis due to its retrograde blood supply. Which vessel provides the primary intraosseous retrograde blood supply to the proximal scaphoid?

A trauma patient undergoes a prophylactic four-compartment fasciotomy of the leg. During the release of the deep posterior compartment, which of the following muscle bellies will be directly encountered?

The primary soft-tissue stabilizer of the posterior pelvic ring, providing the strongest resistance against vertical shear forces, is the:

In Guyon's canal at the wrist, the ulnar nerve bifurcates into superficial and deep branches. Which of the following anatomic structures forms the primary floor of Guyon's canal?

During a posterior triceps-splitting approach to the humerus, the radial nerve is identified. In relation to the posterior humerus, at what approximate distance from the lateral epicondyle does the radial nerve typically cross the posterior midshaft?

The central band of the forearm interosseous membrane is critical for longitudinal stability of the radioulnar relationship. What is the predominant fiber orientation of this central band?

In the adult hip, the predominant blood supply to the superior weight-bearing dome of the femoral head is derived from which of the following vessels?

The vertebral artery typically enters the transverse foramen of the cervical spine at which vertebral level?

The subscapularis muscle is unique among the rotator cuff muscles due to its dual innervation. Which of the following nerves provides innervation to the inferior portion of the subscapularis?

During a minimally invasive repair of an Achilles tendon rupture, care must be taken to avoid the sural nerve. At what approximate level does the sural nerve typically cross the lateral border of the Achilles tendon?

The medial and lateral menisci of the knee exhibit distinct anatomical differences. Which of the following statements regarding meniscal anatomy is correct?

A 25-year-old male is undergoing an open Latarjet procedure. During the approach, the surgeon must identify and protect the musculocutaneous nerve. What is the classic anatomic relationship of the musculocutaneous nerve to the coracoid process?

During a posterior approach to the hip for total hip arthroplasty, the surgeon must take care not to injure the primary blood supply to the femoral head. Anatomically, where does the deep branch of the medial femoral circumflex artery (MFCA) course in relation to the short external rotators?

A 34-year-old male sustains a distal humerus fracture requiring plate osteosynthesis via a posterior approach. The surgeon performs an olecranon osteotomy. When elevating the supinator muscle to expose the proximal radius, the posterior interosseous nerve (PIN) is at risk. Which anatomic structure marks the proximal edge of the superficial head of the supinator where the PIN commonly enters?

A surgeon is performing an anterior cervical discectomy and fusion (ACDF) at C5-C6. During lateral decompression of the uncovertebral joint, there is a risk of injuring the vertebral artery. In the standard human anatomy, at which cervical level does the vertebral artery typically enter the transverse foramen?

A 45-year-old patient presents with a displaced acetabular fracture requiring surgical fixation via an ilioinguinal approach. During the dissection, severe hemorrhage is encountered posterior to the superior pubic ramus. Which of the following anatomic variants is the most likely source of the bleeding?

During a direct lateral (Hardinge) approach to the hip, the anterior third of the gluteus medius is split to gain access to the joint. Splitting the muscle too proximally risks denervating the remaining anterior portion of the muscle. What is the accepted safe zone for splitting the gluteus medius proximal to the tip of the greater trochanter to avoid injuring the superior gluteal nerve?

A 28-year-old athlete undergoes an open repair of a completely ruptured pectoralis major tendon. The surgeon notes that the tendon consists of two primary heads with a unique insertion pattern. Which of the following accurately describes the anatomic insertion of the pectoralis major tendon onto the humerus?

A patient with persistent medial midfoot pain is diagnosed with intersection syndrome of the foot (Master Knot of Henry). This anatomical site is critical for understanding tendon transfers in the midfoot. Which best describes the anatomic relationship at the Master Knot of Henry?

A 22-year-old sustains a traumatic posterolateral elbow dislocation. During surgical reconstruction of the lateral ulnar collateral ligament (LUCL), accurate placement of the isometric origin and insertion points is essential. What are the true anatomical attachments of the LUCL?

A patient is scheduled for an extreme lateral interbody fusion (XLIF) at L4-L5. The trans-psoas approach places specific nerves of the lumbar plexus at risk. Which nerve lies most anteriorly on the surface of the psoas major muscle and is highly vulnerable during initial psoas dilation?

A 19-year-old football player undergoes an anterior cruciate ligament (ACL) reconstruction. The surgeon wishes to replicate the native anatomy of the ACL bundles. Which statement correctly describes the femoral footprint of the ACL bundles with the knee in extension?

A surgeon is repairing a ruptured Achilles tendon using a percutaneous technique. The sural nerve is at risk of being ensnared by the passing sutures. In relation to the lateral border of the Achilles tendon, at what approximate distance proximal to the calcaneal insertion does the sural nerve typically cross from lateral to medial?

A patient presents with inability to make an "OK" sign with their thumb and index finger following a penetrating forearm injury. Which of the following muscles are denervated in this patient's specific nerve palsy?

A 30-year-old patient with intractable piriformis syndrome is undergoing surgical release. The surgeon considers the anatomic variations of the sciatic nerve in relation to the piriformis muscle. What is the most common anatomical variation (Beaton and Anson Type B) of the sciatic nerve?

A 55-year-old cyclist complains of numbness and tingling in his ring and small fingers, diagnosed as ulnar tunnel syndrome (Guyon's canal compression). When releasing Guyon's canal, the surgeon must understand its anatomic boundaries. What structure forms the floor of Guyon's canal?

A 24-year-old presents with a scaphoid waist fracture. The surgeon opts for percutaneous screw fixation. A deep understanding of the scaphoid's blood supply is necessary to appreciate the risk of avascular necrosis. Which vessel provides the primary blood supply to the proximal pole of the scaphoid?

During a volar approach to the forearm (Henry approach) for a middle-third radius fracture, the surgeon develops the internervous plane. Between which two muscles is the proximal interval of the Henry approach classically developed?

A 60-year-old female is undergoing an open carpal tunnel release. The surgeon is extending the incision proximally into the distal forearm. To avoid injury to the palmar cutaneous branch of the median nerve, where should the incision be placed relative to the palmaris longus tendon?

During closed reduction and percutaneous pinning of a supracondylar humerus fracture in a pediatric patient, a medial pin is placed. The patient subsequently exhibits weakness in spreading their fingers and numbness in the small digit. At what anatomical location does the affected nerve run in relation to the medial epicondyle?

A surgeon is exposing the distal fibula for an ankle fracture utilizing a lateral approach. To avoid injuring the superficial peroneal nerve as it transitions from the deep to the superficial compartment, the surgeon should be aware of its typical exit point. Where does the superficial peroneal nerve typically pierce the crural fascia in relation to the lateral malleolus?

A 25-year-old male sustains a posterior shoulder dislocation resulting in isolated weakness in external rotation and a sensory deficit over the lateral deltoid. Which of the following defines the borders of the anatomic space through which the injured nerve passes?

During surgical fixation of a talar neck fracture, preservation of the blood supply is paramount to prevent avascular necrosis. Which artery provides the predominant vascular supply to the body of the talus?

When performing a posterior approach to the humerus for internal fixation, the radial nerve must be identified and protected. At approximately what distance proximal to the lateral epicondyle does the radial nerve cross the lateral intermuscular septum from posterior to anterior?

An orthopedic surgeon utilizes the anterior (Smith-Petersen) approach for a core decompression of the hip. This approach utilizes a true internervous plane. Which two nerves supply the muscles that form the superficial boundary of this plane?

A patient presents with medial thigh numbness and weakness in hip adduction following a high-energy pelvic ring fracture. The affected nerve originates from the lumbar plexus. Anatomically, how does this nerve normally emerge from the psoas major muscle?

During a volar approach to the proximal radius (Henry approach), the surgeon dissects between the brachioradialis and the pronator teres. Which of the following describes the innervation of these two muscles respectively?

A patient experiences an inability to extend the fingers at the metacarpophalangeal joints, but wrist extension is preserved with radial deviation. Entrapment of the responsible nerve most commonly occurs at the Arcade of Frohse. Which structure forms this arch?

Scaphoid fractures are prone to nonunion and avascular necrosis due to their unique blood supply. How does the predominant vascular supply enter the scaphoid?

A surgeon is exposing the medial tibia to harvest hamstring tendons for ACL reconstruction. From anterior to posterior, what is the correct anatomic order of the pes anserinus tendon insertions?

During a posterior spinal fusion in the lumbar spine, standard pedicle screws are placed. The ideal anatomical starting point for a lumbar pedicle screw is located at the intersection of which structures?

In Acromioclavicular (AC) joint reconstructions, reconstructing the coracoclavicular (CC) ligaments anatomically is vital. Which of the following accurately describes the anatomical orientation and footprint of the CC ligaments on the clavicle?

A patient requires open reduction internal fixation of a posterior wall acetabular fracture via the Kocher-Langenbeck approach. To protect the main blood supply to the femoral head, which structure should ideally be left intact or minimally disturbed?

Extensor pollicis longus (EPL) tendon ruptures can occur following distal radius fractures. The EPL tendon typically passes around a bony prominence on the dorsal radius. This prominence acts as a pulley and separates which two extensor compartments?

Anterolateral and anteromedial portals are standard in anterior ankle arthroscopy. Establishing the anterolateral portal places which of the following nerves at highest risk of iatrogenic injury?