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 3521
Topic: 9. Shoulder and Elbow
Which of the following is considered a hallmark clinical presentation of elbow osteoarthritis?
Correct Answer & Explanation
. Pain and stiffness, worse with activity and after rest, with loss of terminal extension and/or flexion
Explanation
The hallmark clinical presentation of elbow osteoarthritis is progressive pain and stiffness, which is typically worse with activity and after periods of rest (morning stiffness), and is characterized by a gradual loss of terminal elbow extension and/or flexion. Acute onset of severe pain or diffuse swelling/erythema are more indicative of acute inflammatory processes or infection. Predominantly nocturnal pain or radiating pain to the shoulder with minimal elbow symptoms are not typical for isolated elbow OA.
Question 3522
Topic: 9. Shoulder and Elbow
Regarding the rehabilitation protocol following open debridement and osteophyte excision for elbow osteoarthritis, what is a key principle?
Correct Answer & Explanation
. Early, active range of motion, often initiated within days of surgery.
Explanation
A key principle in rehabilitation following open debridement and osteophyte excision for elbow osteoarthritis is early, active range of motion. This is crucial to prevent postoperative stiffness and arthrofibrosis, which are common complications. Immobilization is generally minimized or avoided. Immediate full weight-bearing is not advised. Strengthening exercises are typically introduced gradually after initial motion goals are achieved. While improving terminal extension is a goal, aggressive passive stretching early on can be counterproductive and increase inflammation, potentially leading to more stiffness or heterotopic ossification; gentle, controlled active and passive assistance is preferred.
Question 3523
Topic: 9. Shoulder and Elbow
Which of the following radiographic findings in a patient with elbow osteoarthritis might suggest a secondary cause, such as a prior inflammatory condition, rather than primary degenerative OA?
Correct Answer & Explanation
. Bone erosions
Explanation
Bone erosions (areas of bone destruction at the joint margins) are characteristic findings in inflammatory arthropathies like rheumatoid arthritis or psoriatic arthritis, which can secondarily lead to destructive changes resembling OA. Primary degenerative osteoarthritis typically features subchondral sclerosis, diffuse osteophyte formation, asymmetric joint space narrowing, and subchondral cysts, but true bone erosions are not a hallmark of primary OA. Concentric joint space narrowing can be seen in both, but erosions strongly point to an inflammatory component.
Question 3524
Topic: 9. Shoulder and Elbow
A 45-year-old right-hand dominant carpenter presents with two months of worsening left elbow pain, particularly with gripping and lifting. He denies any acute trauma. On examination, he has tenderness over the lateral epicondyle, pain with resisted wrist extension, and a positive Cozen's test. Radiographs are unremarkable. Which of the following is the most appropriate initial management step?
Correct Answer & Explanation
. Activity modification and physical therapy focusing on eccentric strengthening
Explanation
The patient presents with classic symptoms of lateral epicondylitis (tennis elbow), which is typically a degenerative process of the ECRB origin rather than an inflammatory one. Initial management is almost always conservative, focusing on activity modification, physical therapy (especially eccentric strengthening of the wrist extensors), bracing, and pain control. Corticosteroid injections can provide short-term relief but have been shown to have worse long-term outcomes and potential adverse effects. Surgery is reserved for failed conservative management (typically after 6-12 months). MRI is usually not indicated unless atypical symptoms, failure to respond to initial conservative treatment, or a suspected different pathology (e.g., intra-articular loose body, osteochondral lesion) are present. NSAIDs can help with pain but don't address the underlying tendinosis, and splinting alone is insufficient.
Question 3525
Topic: 9. Shoulder and Elbow
What anatomical structure provides the primary static restraint to valgus stress in the elbow?
Correct Answer & Explanation
. Ulnar collateral ligament (anterior bundle)
Explanation
The ulnar collateral ligament (UCL), specifically its anterior bundle, is the primary static stabilizer against valgus stress at the elbow, particularly from 30 to 120 degrees of flexion. The radial collateral ligament stabilizes against varus stress. The annular ligament stabilizes the radial head against the ulna. The medial epicondyle is an attachment site for the UCL and flexor-pronator mass but is not a primary static restraint itself. The capitellum is part of the articulation.
Question 3526
Topic: 9. Shoulder and Elbow
What is the primary function of the anconeus muscle in the elbow?
Correct Answer & Explanation
. Assistance in elbow extension and stabilization of the ulna during pronation/supination
Explanation
The anconeus muscle is a small muscle located on the posterolateral aspect of the elbow. Its primary function is to assist the triceps in elbow extension and, importantly, to stabilize the ulna during forearm pronation and supination movements. It is not a primary flexor, pronator, or wrist extensor, nor is its main role the stabilization of the radial head (which is primarily the annular ligament).
Question 3527
Topic: 9. Shoulder and Elbow
A 28-year-old construction worker presents with chronic elbow pain, stiffness, and catching sensations after a fall onto an outstretched hand two years prior. Radiographs show osteophytes and mild degenerative changes, but no loose bodies are apparent. MRI reveals a large osteochondral defect of the capitellum and multiple intra-articular loose bodies. What is the most appropriate treatment strategy for symptomatic osteochondritis dissecans (OCD) of the capitellum with loose bodies in an adult?
Correct Answer & Explanation
. Elbow arthroscopy with loose body removal and debridement/microfracture of the defect
Explanation
For symptomatic osteochondritis dissecans (OCD) of the capitellum with loose bodies in an adult, arthroscopic intervention is often indicated. Loose bodies cause mechanical symptoms (catching, locking, pain), and the osteochondral defect contributes to pain and stiffness. Arthroscopy allows for removal of loose bodies and addressing the defect, typically with debridement, drilling, or microfracture to stimulate fibrocartilage formation. Activity modification and NSAIDs are rarely sufficient for mechanical symptoms caused by loose bodies. Proximal ulna osteotomy is for cubitus varus correction. Total elbow arthroplasty is reserved for severe, end-stage degenerative disease, and corticosteroid injections are not curative for mechanical issues.
Question 3528
Topic: 9. Shoulder and Elbow
A 70-year-old patient with rheumatoid arthritis presents with severe, end-stage elbow destruction, pain, and limited range of motion. She is unable to perform activities of daily living. She has a sedentary lifestyle and minimal manual labor requirements. What is the most appropriate surgical intervention?
Correct Answer & Explanation
. Total elbow arthroplasty
Explanation
For severe, end-stage rheumatoid arthritis of the elbow with functional impairment in a low-demand patient, total elbow arthroplasty (TEA) is generally the treatment of choice. It aims to provide pain relief and improve range of motion. Elbow arthrodesis (fusion) results in a stiff elbow, which is poorly tolerated. Interposition arthroplasty (fascia lata, dermis) is historical or reserved for very specific scenarios. Radial head excision helps with pain but doesn't address the entire joint. Debridement arthroplasty provides temporary relief but not long-term solutions for severe destruction.
Question 3529
Topic: 9. Shoulder and Elbow
What is the purpose of the 'circle of motion' concept in elbow stability?
Correct Answer & Explanation
. Illustrates the sequential disruption of stabilizers in elbow dislocation (lateral to medial)
Explanation
The 'circle of motion' concept, specifically the 'Horii Circle of Instability,' describes the sequential pattern of soft tissue disruption that leads to elbow dislocation, typically from lateral to medial (LCL complex, then anterior/posterior capsule, then UCL). Understanding this pattern helps predict the stability of the elbow after injury and guides repair strategies, especially in posterolateral rotatory instability.
Question 3530
Topic: Elbow & Forearm
What is the primary role of the radial head in elbow stability?
Correct Answer & Explanation
. Secondary stabilizer to valgus stress and primary stabilizer to axial compression
Explanation
The radial head plays a crucial role as a secondary stabilizer to valgus stress (after the UCL) and is a primary stabilizer against axial compression loads across the humeroradial joint. It also contributes to varus stability. It is not the primary restraint to valgus or varus stress alone. While the annular ligament stabilizes the radial head for pronation/supination, the radial head itself isn't the primary stabilizer of these movements. The common extensor tendon originates from the lateral epicondyle, not the radial head.
Question 3531
Topic: 9. Shoulder and Elbow
A 40-year-old diabetic patient presents with a stiff elbow following prolonged immobilization for a forearm fracture. Range of motion is severely limited, with an arc of motion less than 30 degrees. Radiographs show significant heterotopic ossification bridging the joint. What is the most appropriate surgical approach for managing severe elbow stiffness with heterotopic ossification?
Correct Answer & Explanation
. Open surgical release with excision of heterotopic ossification
Explanation
For severe elbow stiffness with mature heterotopic ossification that significantly limits function, open surgical release with careful excision of the ossification is often necessary. Post-operatively, a structured rehabilitation program, often with continuous passive motion (CPM) or dynamic splinting, and sometimes prophylactic radiation or NSAIDs to prevent recurrence of HO, is critical. Dynamic splinting and serial casting are generally used for less severe stiffness or as adjuncts to surgery. Radiation therapy is primarily prophylactic to prevent HO recurrence, not to treat existing, mature HO. Elbow arthroplasty is for end-stage arthritis, not primarily for stiffness due to HO.
Question 3532
Topic: Elbow & Forearm
Which of the following anatomical structures is most commonly responsible for anterior elbow impingement symptoms?
Correct Answer & Explanation
. Coronoid process hypertrophy
Explanation
Anterior elbow impingement symptoms, often presenting as pain and limited extension, are most commonly caused by hypertrophy of the coronoid process (or its osteophytes) impinging against the coronoid fossa of the humerus. Olecranon osteophytes cause posterior impingement. Radial head hypertrophy can cause symptoms, but less typically anterior impingement. Medial epicondyle spurs are associated with UCL pathology, and capitellum defects with OCD, not primary anterior impingement.
Question 3533
Topic: 9. Shoulder and Elbow
What is the optimal position for immobilization of the elbow following an uncomplicated posterior dislocation in an adult?
Correct Answer & Explanation
. 90 degrees of flexion with the forearm in neutral rotation
Explanation
Following an uncomplicated posterior elbow dislocation, the elbow is typically immobilized in approximately 90 degrees of flexion with the forearm in neutral rotation. This position provides maximum stability and minimizes stress on the healing capsular ligaments. Full extension or full flexion can be unstable or uncomfortable. The duration of immobilization is usually short (1-3 weeks) to prevent stiffness, followed by early controlled range of motion.
Question 3534
Topic: Elbow & Forearm
Which clinical test is most specific for diagnosing posterolateral rotatory instability (PLRI) of the elbow?
Correct Answer & Explanation
. Lateral pivot shift test of the elbow
Explanation
The lateral pivot shift test of the elbow (or chair push-up test, posterior drawer test with valgus stress) is the most specific clinical test for diagnosing posterolateral rotatory instability (PLRI). This test reproduces the subluxation and reduction of the radial head and ulna relative to the humerus, which is pathognomonic for PLRI due to insufficiency of the lateral ulnar collateral ligament (LUCL). The valgus and varus stress tests assess the medial and lateral collateral ligaments respectively, while the moving valgus stress test assesses UCL integrity. Cozen's test is for lateral epicondylitis.
Question 3535
Topic: 9. Shoulder and Elbow
What is the primary goal of surgical management for a Mason Type II radial head fracture?
Correct Answer & Explanation
. Anatomical reduction and stable internal fixation
Explanation
A Mason Type II radial head fracture is a displaced, but not comminuted, fracture. The primary goal of surgical management for a Mason Type II fracture, especially if it blocks motion or causes mechanical symptoms, is anatomical reduction and stable internal fixation. This preserves the radial head, which is crucial for elbow and forearm stability and kinematics. Radial head excision is generally reserved for unreconstructible fractures (Type III) or specific contexts. Replacement is for Type III fractures or concomitant ligamentous injuries. Total elbow arthroplasty and arthrodesis are for end-stage conditions.
Question 3536
Topic: 9. Shoulder and Elbow
In a complete tear of the distal biceps tendon, which muscle primarily provides elbow flexion power?
Correct Answer & Explanation
. Brachialis
Explanation
In a complete tear of the distal biceps tendon, the brachialis muscle becomes the primary elbow flexor. The brachialis inserts on the coronoid process and ulnar tuberosity, acting as a pure elbow flexor regardless of forearm rotation. The brachioradialis also contributes to flexion, especially in neutral rotation, but the brachialis is more powerful. The triceps extends the elbow. The flexor carpi ulnaris and pronator teres are forearm muscles with different primary actions.
Question 3537
Topic: 9. Shoulder and Elbow
What is the most common cause of post-traumatic elbow stiffness?
Correct Answer & Explanation
. Anterior capsule contracture
Explanation
While heterotopic ossification (HO) is a significant cause of post-traumatic elbow stiffness, the most common cause of restricted motion is contracture of the anterior capsule, often combined with posterior capsule contracture. The anterior capsule limits extension, and the posterior capsule limits flexion. HO often complicates these capsular contractures but is not universally present or the sole cause. Loss of articular congruity certainly contributes but is an underlying bony issue, not solely a soft tissue contracture.
Question 3538
Topic: 9. Shoulder and Elbow
A 5-year-old child presents with a 'pulled elbow' (nursemaid's elbow). What is the underlying pathological lesion?
Correct Answer & Explanation
. Annular ligament interposition
Explanation
A 'pulled elbow' or nursemaid's elbow is a subluxation of the radial head. The annular ligament slips over the radial head and becomes trapped in the radiocapitellar joint, preventing full reduction. It is not a true dislocation of the entire elbow joint, a fracture, or a ligament sprain in the traditional sense, but rather an interposition of the annular ligament.
Question 3539
Topic: 9. Shoulder and Elbow
In an adult with acute, unstable elbow dislocation, what is the typical initial treatment after closed reduction?
Correct Answer & Explanation
. Early controlled range of motion (ROM) with a hinged brace
Explanation
After closed reduction of an uncomplicated, stable elbow dislocation in an adult, the initial treatment typically involves a brief period of immobilization (1-3 weeks) followed by early controlled range of motion with a hinged brace. Prolonged immobilization can lead to severe stiffness. Immediate surgical stabilization is reserved for unstable dislocations after reduction, irreducible dislocations, or those with associated fractures requiring fixation. Dynamic external fixation is for complex unstable dislocations. Corticosteroid injection is not indicated.
Question 3540
Topic: Elbow & Forearm
What is the primary stabilizer of the proximal radioulnar joint?
Correct Answer & Explanation
. Annular ligament
Explanation
The annular ligament is the primary stabilizer of the proximal radioulnar joint. It encircles the radial head, holding it in firm apposition with the radial notch of the ulna, thereby allowing pronation and supination while preventing proximal migration or subluxation of the radial head. The interosseous membrane and oblique cord are distal to this joint and provide stability to the forearm generally. The quadrate ligament also contributes to PRUJ stability but is secondary to the annular ligament. The radial collateral ligament stabilizes the humeroradial joint.
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