This practice set contains high-yield board review questions covering key concepts in 9. Shoulder and Elbow. Each clinical scenario is designed to test your diagnostic and management skills relevant to this subspecialty.
Question 2981
Topic: Elbow & Forearm
When is an annular ligament reconstruction typically indicated for a Monteggia fracture?
Correct Answer & Explanation
. When there is a chronic radial head dislocation with an attenuated or absent annular ligament after corrective ulnar osteotomy and radial head open reduction.
Explanation
Annular ligament reconstruction is generally indicated in cases of chronic, neglected Monteggia fractures, particularly in adults or older children, where the annular ligament is severely attenuated, scarred, or completely absent. After a corrective ulnar osteotomy and open reduction of the radial head, if the radial head remains unstable, reconstruction of the annular ligament (e.g., using a fascial graft) is often necessary to provide long-term stability. In acute settings, if the radial head reduces concentrically and is stable after ulnar fixation, reconstruction is typically not needed, as the native ligament (even if stretched) usually has healing potential.
Question 2982
Topic: Elbow & Forearm
What anatomical feature of the radial head and capitellum joint makes its concentric reduction critical for long-term function?
Correct Answer & Explanation
. The congruency of the spherical capitellum articulating with the concave radial head, allowing for smooth rotation.
Explanation
The radiocapitellar joint is a critical articulation for forearm rotation. The spherical capitellum articulates with the concave radial head, forming a highly congruent joint that facilitates smooth pronation and supination. Any persistent incongruity or dislocation (as in an unreduced Monteggia fracture) disrupts this precise articulation, leading to abnormal loading, restricted rotation, pain, and accelerated degenerative changes. Concentric reduction is therefore paramount to restore normal biomechanics and preserve long-term function. Laxity and medial collateral ligaments are important but don't directly describe the primary articular function for rotation.
Question 2983
Topic: Elbow & Forearm
What is the primary goal of surgical management for a chronic Monteggia fracture in a child with a persistently dislocated radial head?
Correct Answer & Explanation
. Corrective ulnar osteotomy with open reduction of the radial head and annular ligament reconstruction.
Explanation
For a chronic Monteggia fracture in a child with a persistently dislocated radial head, the primary goal of surgical management is to restore the normal anatomical relationship of the radiocapitellar joint. This typically involves a corrective ulnar osteotomy to restore forearm length and alignment, followed by open reduction of the radial head. Because the annular ligament is likely attenuated or absent in chronic cases, reconstruction of the annular ligament (e.g., with a fascial graft) is often necessary to stabilize the radial head. Radial head excision is generally avoided in children due to potential long-term issues like proximal radial migration and wrist pain. Arthrodesis or DRUJ fusion are salvage procedures and not primary treatment for chronic Monteggia. Dynamic splinting is adjunctive post-op, not primary treatment.
Question 2984
Topic: 9. Shoulder and Elbow
A 55-year-old patient presents with an olecranon fracture. Standard AP and lateral radiographs show a transverse, displaced fracture. What additional radiographic view is most beneficial for further characterization, particularly to assess comminution and articular involvement?
Correct Answer & Explanation
. Oblique views (internal and external)
Explanation
While standard AP and lateral views are essential, oblique views (B) provide additional perspectives that can be invaluable. They help to better delineate the fracture pattern, identify comminution not clearly seen on orthogonal views, and assess the extent of articular involvement (e.g., small intra-articular fragments or subtle step-offs). This detailed information is crucial for surgical planning. Radial head-capitellum view (A) is for radial head fractures. Axillary view (C) is typically for shoulder dislocations. Stress views (D) assess ligamentous instability. Contralateral views (E) are for comparing anatomical variations or growth plate status in children.
Question 2985
Topic: 9. Shoulder and Elbow
The olecranon effectively functions as a lever arm. This anatomical advantage primarily contributes to which function?
Correct Answer & Explanation
. Elbow extension
Explanation
The olecranon's primary function as a lever arm is to enhance the efficiency of the triceps brachii muscle in extending the elbow (D). Its posterior projection increases the moment arm for the triceps, allowing it to generate greater torque for extension with less muscle force. This biomechanical advantage is crucial for powerful elbow extension.
Question 2986
Topic: Elbow & Forearm
Which of the following anatomical structures stabilizes the olecranon against varus stress?
Correct Answer & Explanation
. Lateral ulnar collateral ligament (LUCL)
Explanation
The Medial Collateral Ligament (MCL) (A), specifically its anterior bundle, is the primary static stabilizer of the elbow against valgus stress. While the question asks aboutvarusstress and the olecranon, the olecranon itself doesn't directly stabilize against varus stress in the same way the MCL resists valgus. However, the integrity of the ulnohumeral joint (where the olecranon articulates) is indirectly influenced by all ligamentous structures. The lateral ulnar collateral ligament (LUCL) (B) stabilizes against varus and posterolateral rotatory instability. Given the options and the 'stabilizes the olecranon' context, it's slightly ambiguous. Re-reading, it is asking what stabilizes 'the olecranon', which is part of the ulna, against varus stress. The LUCL stabilizes the ulnar side of the joint, preventing it from varus opening. Therefore, LUCL is the correct answer for varus stability related to the ulna/olecranon. My initial thought process was incorrect. The question isn't about the olecranon resisting varus stress, but what ligament prevents the ulna (and thus olecranon) from gapping open on the lateral side under varus stress. This would be the LUCL. Let me correct the answer and explanation.
Question 2987
Topic: Elbow & Forearm
Which of the following anatomical structures primarily stabilizes the ulnohumeral joint against varus stress?
Correct Answer & Explanation
. Lateral ulnar collateral ligament (LUCL)
Explanation
The Lateral Ulnar Collateral Ligament (LUCL) (B) is the primary static stabilizer of the ulnohumeral joint (and thus the olecranon-bearing ulna) against varus stress and posterolateral rotatory instability. The Medial Collateral Ligament (MCL) (A) stabilizes against valgus stress. The annular ligament (C) stabilizes the radial head. The triceps tendon (D) extends the elbow. The interosseous membrane (E) connects the radius and ulna along the forearm.
Question 2988
Topic: Elbow & Forearm
Which of the following is NOT an acceptable criterion for non-operative management of a diaphyseal forearm fracture in an adult?
Correct Answer & Explanation
. Radial head subluxation.
Explanation
Radial head subluxation (Option D) indicates a Monteggia equivalent injury, which is inherently unstable and typically requires operative management for both the ulna fracture and the radial head dislocation. The other options (A, B, C) represent commonly accepted parameters forsuccessfulnon-operative management of isolated diaphyseal forearm fractures in adults. An intact interosseous membrane (Option E) is not an 'acceptable criterion' per se, but rather a structural factor important for stability; a disrupted IM often indicates greater instability.
Question 2989
Topic: 9. Shoulder and Elbow
What is the ideal position for immobilization of the forearm after successful closed reduction of a mid-shaft both bones forearm fracture in a long arm cast?
Correct Answer & Explanation
. Neutral rotation (mid-pronation/supination).
Explanation
For mid-shaft both bones forearm fractures, immobilization in neutral rotation (mid-pronation/supination) (Option C) is generally recommended. This position places the interosseous membrane under minimal tension, and both the pronator and supinator muscle groups are relatively relaxed, which can help maintain reduction and prevent displacement. Full supination (Option A) or pronation (Option B) can put tension on either pronators or supinators, potentially causing displacement. Elbow flexion (D, E) is also important to prevent rotation and stabilize the elbow, typically 90 degrees.
Question 2990
Topic: 9. Shoulder and Elbow
A 55-year-old male presents with worsening right shoulder pain, especially at night and with overhead activities. He has limited active range of motion, particularly abduction and external rotation, but passive range of motion is relatively preserved. Impingement signs are positive. Plain radiographs show superior migration of the humeral head and sclerosis of the greater tuberosity. What is the most likely diagnosis?
Correct Answer & Explanation
. Massive rotator cuff tear
Explanation
The presence of superior migration of the humeral head on radiographs, combined with significant pain, limited active range of motion (especially abduction and external rotation), positive impingement signs, and relatively preserved passive range of motion, is highly indicative of a massive rotator cuff tear. Superior migration occurs when the deltoid acts unopposed by the torn supraspinatus, leading to superior subluxation of the humeral head. Glenohumeral osteoarthritis would typically show joint space narrowing and osteophytes, and adhesive capsulitis would significantly limit both active and passive range of motion.
Question 2991
Topic: 9. Shoulder and Elbow
A 40-year-old male with a history of intravenous drug use presents with acute onset of fever, chills, and severe pain in his left shoulder. Physical examination reveals exquisite tenderness over the anterior shoulder and pain with any attempt at passive or active shoulder motion. Labs show elevated WBC, ESR, and CRP. What is the most likely diagnosis?
Correct Answer & Explanation
. Septic arthritis of the glenohumeral joint
Explanation
The clinical picture of acute fever, chills, severe pain, and 'pseudoparalysis' (inability to move due to pain) of the shoulder in a patient with risk factors (IV drug use) points strongly to septic arthritis of the glenohumeral joint. Elevated inflammatory markers further support an infectious process. Definitive diagnosis requires joint aspiration. The other conditions are less likely to present with such an acute, systemic febrile illness.
Question 2992
Topic: 9. Shoulder and Elbow
A 55-year-old female presents with chronic lateral elbow pain, worse with gripping and wrist extension. Physical examination reveals tenderness over the lateral epicondyle and pain with resisted wrist extension and resisted middle finger extension. What is the most appropriate initial treatment?
Correct Answer & Explanation
. Rest, NSAIDs, and physical therapy with eccentric strengthening exercises
Explanation
The patient's symptoms are classic for lateral epicondylitis (tennis elbow), which is typically a degenerative process of the common extensor origin (extensor carpi radialis brevis). Initial treatment is overwhelmingly non-operative and involves rest, NSAIDs, counterforce bracing, and a structured physical therapy program emphasizing eccentric strengthening exercises of the wrist extensors. Corticosteroid injections offer short-term relief but can have long-term adverse effects on tendon integrity and recurrence rates. Surgery or PRP are reserved for failed conservative management.
Question 2993
Topic: 9. Shoulder and Elbow
What is a recognized long-term complication of treating humeral shaft fractures with non-operative methods that achieve union?
Correct Answer & Explanation
. Minor cosmetic deformity (e.g., perceptible angulation or shortening)
Explanation
While non-operative management of humeral shaft fractures generally results in high union rates and good functional outcomes, minor cosmetic deformity (perceptible angulation or shortening within acceptable limits) is a recognized long-term consequence. Patients typically tolerate this well functionally due to the compensatory motion of the shoulder joint. Chronic infection and hardware failure are complications of operative treatment. Permanent severe radial nerve palsy is rare, and elbow stiffness is more commonly associated with operative procedures, especially retrograde nailing or distal plating, or prolonged immobilization in certain positions, but less so with functional bracing for the shaft itself.
Question 2994
Topic: Elbow & Forearm
A 6-year-old boy falls on an outstretched hand and presents with severe forearm pain. Radiographs demonstrate an isolated transverse fracture of the proximal ulnar diaphysis with apex-anterior angulation. The radiocapitellar line does not bisect the capitellum on any view. According to the Bado classification, what is the specific associated injury in this type of Monteggia fracture?
Correct Answer & Explanation
. Anterior dislocation of the radial head
Explanation
A Monteggia fracture-dislocation consists of a proximal third ulnar fracture with a radial head dislocation. The Bado classification describes the direction of the radial head dislocation, which generally follows the apex of the ulnar fracture angulation. Apex-anterior ulnar angulation is associated with an anterior dislocation of the radial head (Bado Type I), which is the most common type in children.
Question 2995
Topic: 9. Shoulder and Elbow
A 62-year-old active male presents with chronic severe right shoulder pain, weakness, and significant functional limitation, particularly with overhead activities. MRI reveals a massive, retracted, and chronically degenerated rotator cuff tear involving the supraspinatus, infraspinatus, and subscapularis, deemed irreparable by two surgeons. He has failed extensive conservative management. Radiographs show mild glenohumeral arthritis and superior migration of the humeral head. What is the most appropriate surgical option to improve his function and pain?
Correct Answer & Explanation
. Reverse total shoulder arthroplasty.
Explanation
This patient presents with a massive, irreparable rotator cuff tear with superior humeral head migration (cuff tear arthropathy) and significant functional impairment despite conservative management. In this scenario, particularly in an older, active patient, a reverse total shoulder arthroplasty (RTSA) (Option B) is the most appropriate surgical option. RTSA reverses the ball and socket, placing the glenoid sphere on the scapula and the socket on the humerus, thereby medializing and distalizing the center of rotation. This allows the deltoid muscle to become the primary elevator of the arm, bypassing the deficient rotator cuff and providing reliable pain relief and improved function. Arthroscopic debridement and biceps tenodesis (Option A) might provide some pain relief but will not address the functional deficit of a massive tear with superior migration. Latissimus dorsi transfer (Option C) is a reconstructive option typically considered for younger, active patients with isolated posterosuperior irreparable tears. Partial repair (Option D) is not feasible for an irreparable tear. Superior capsular reconstruction (Option E) is a newer technique for specific irreparable tears, but less predictable than RTSA in older patients with established cuff tear arthropathy.
Question 2996
Topic: 9. Shoulder and Elbow
A 40-year-old male sustains a severe traumatic brachial plexus injury (avulsion of C5, C6, C7, C8, T1 nerve roots) in a motorcycle accident, resulting in a flail arm. He presents 6 months post-injury with no functional recovery. What is the MOST appropriate surgical intervention to restore elbow flexion and shoulder abduction?
Correct Answer & Explanation
. Nerve transfers (e.g., triceps fascicle to biceps, spinal accessory to suprascapular nerve).
Explanation
This patient has a complete, severe traumatic brachial plexus injury with avulsion of multiple nerve roots, resulting in a flail arm and no functional recovery 6 months post-injury. Avulsion injuries are preganglionic and cannot be directly repaired or grafted.Option A (Neurolysis and primary repair) is inappropriate for avulsion injuries, as the nerve roots are torn from the spinal cord, making direct repair impossible.Option B (Nerve grafting) is also not possible for preganglionic avulsion injuries.Option C (Free functional muscle transfer) is an advanced reconstructive option, typically performed in cases of complete flail arm where nerve transfers have failed or are not feasible, particularly for restoring complex movements like elbow flexion. While it can be considered, nerve transfers are usually the first line for specific function restoration when possible.Option D (Nerve transfers) is the MOST appropriate and commonly used surgical intervention for this type of injury. In root avulsion injuries, distal nerves are often intact, allowing for transfer of less critical motor nerves (donors) to more critical recipient nerves to restore function. For elbow flexion, transfers like an ulnar nerve fascicle to the biceps motor nerve, or a triceps fascicle to the biceps motor nerve (Oberlin procedure), are common. For shoulder abduction, transfer of the spinal accessory nerve to the suprascapular nerve is a classic procedure. These are performed within 6-9 months for best results.Option E (Arthrodesis) is a salvage procedure to stabilize a flail joint, providing a stable platform for hand function, but it sacrifices motion and is not aimed at restoring active motor function of the muscles.
Question 2997
Topic: Elbow & Forearm
A 45-year-old male sustains a fall onto an outstretched hand, resulting in severe elbow pain and deformity. Radiographs reveal a posterior elbow dislocation, a comminuted fracture of the coronoid process (O'Driscoll Type III), and a radial head fracture (Mason Type III). The elbow is grossly unstable after closed reduction. Which of the following is the most appropriate definitive surgical management strategy?
Correct Answer & Explanation
. Radial head arthroplasty, coronoid repair/reconstruction, and lateral collateral ligament repair.
Explanation
This patient presents with a 'terrible triad' injury of the elbow: posterior dislocation, radial head fracture, and coronoid fracture. This injury pattern is inherently unstable. The management principles involve addressing all components to restore stability and allow early motion. Mason Type III radial head fractures are comminuted and typically require radial head excision or arthroplasty. Coronoid fractures (especially O'Driscoll Type III, which involves the sublime tubercle or >50% of the coronoid) significantly destabilize the elbow and require fixation or reconstruction. Lateral collateral ligament (LCL) repair is crucial to restore posterolateral stability. Therefore, radial head arthroplasty (to replace the comminuted radial head), coronoid repair/reconstruction (to restore anterior stability), and LCL repair (to restore lateral stability) (Option C) represent the most appropriate and comprehensive surgical strategy. Simply excising the radial head and coronoid without reconstruction (Option B) would lead to persistent instability. ORIF of all fragments (Option A) is only feasible if fragments are large enough for fixation. A posterior olecranon osteotomy (Option D) is rarely needed for terrible triad injuries. Medial collateral ligament (MCL) repair (Option E) might be necessary if grossly unstable on valgus stress, but the LCL is the primary stabilizer injured in this pattern.
Question 2998
Topic: 9. Shoulder and Elbow
A 48-year-old carpenter presents with chronic right shoulder pain, weakness, and difficulty with overhead activities. He has a history of a single traumatic event 3 years prior where he felt a 'pop' in his shoulder while lifting a heavy beam. MRI now shows a massive, irreparable rotator cuff tear involving the supraspinatus, infraspinatus, and subscapularis, with significant fatty infiltration and muscle atrophy. He has pseudoparalysis with active elevation of only 30 degrees. Which of the following is the most appropriate surgical option?
Correct Answer & Explanation
. Reverse total shoulder arthroplasty (rTSA).
Explanation
The patient presents with a chronic, massive, irreparable rotator cuff tear (massive fatty infiltration, atrophy, pseudoparalysis with <90 degrees active elevation). Arthroscopic repair (Option A) is not feasible due to irreparability. Latissimus dorsi transfer (Option B) can improve external rotation and some elevation but is typically reserved for younger, less arthritic patients with intact deltoid function and often for isolated posterior-superior cuff tears. Superior capsular reconstruction (SCR) (Option C) aims to restore superior stability and improve function, typically in younger patients without significant glenohumeral arthritis or severe pseudoparalysis. However, for a 48-year-old with significant pseudoparalysis and an irreparable tear, especially when considering the chronicity, a reverse total shoulder arthroplasty (rTSA) (Option D) is the most appropriate and predictable surgical option. rTSA changes the biomechanics of the shoulder, making the deltoid a more effective elevator, thereby compensating for the irreparable rotator cuff and providing reliable pain relief and improved active elevation. Hemiarthroplasty (Option E) is not indicated here as it does not address the lack of rotator cuff function.
Question 2999
Topic: 9. Shoulder and Elbow
A 72-year-old patient undergoes reverse total shoulder arthroplasty (rTSA) for massive irreparable rotator cuff arthropathy. Two days postoperatively, the patient develops a new axillary nerve palsy, characterized by deltoid weakness and sensory loss over the lateral shoulder. Which of the following is the most likely mechanism of injury and expected prognosis?
Correct Answer & Explanation
. Compression from hematoma in the quadrangular space; variable prognosis depending on hematoma resolution
Explanation
Axillary nerve palsy is a known complication of rTSA, often occurring due to traction during the surgical exposure, particularly with limb lengthening inherent to the rTSA design, or due to aggressive reaming/dissection. However, a significant cause of postoperative nerve palsy that develops slightly delayed is compression from a hematoma within the quadrangular space, where the axillary nerve and posterior circumflex humeral artery travel. The prognosis in such cases is variable and depends on the severity and duration of compression, often improving with hematoma resolution, but not as predictably good as simple traction injury from a brief event. Direct transection or thermal injury would typically present immediately and have a worse prognosis. Ischemia from excessive traction is possible but hematoma is a distinct consideration for delayed presentation. Nerve palsy due to dislocation/reduction would typically occur acutely and be managed differently.
Question 3000
Topic: 9. Shoulder and Elbow
A neonate presents with an adducted, internally rotated shoulder, extended elbow, and pronated forearm ('waiter's tip' posture) following shoulder dystocia during vaginal delivery. Injury to the upper trunk of the brachial plexus (C5-C6) is identified. Which of the following nerves originates directly from the upper trunk and would likely be affected in a pre-ganglionic injury at this level?
Correct Answer & Explanation
. Suprascapular nerve
Explanation
The suprascapular nerve originates directly from the upper trunk (C5-C6) of the brachial plexus. The dorsal scapular and long thoracic nerves originate directly from the nerve roots (C5 and C5-C7, respectively). The medial pectoral and thoracodorsal nerves originate from the medial and posterior cords, respectively. Injury to the suprascapular nerve results in loss of external rotation and abduction initiation, contributing to the Erb's palsy posture.
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