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 3481
Topic: 9. Shoulder and Elbow
A 19-year-old female gymnast presents with atraumatic multidirectional shoulder instability. Following 6 months of physical therapy, she continues to subluxate inferiorly. If surgical intervention is performed, which capsular structure must be primarily addressed to correct the inferior instability?
Correct Answer & Explanation
. Inferior capsular pouch
Explanation
In multidirectional instability (MDI), the primary structural redundancy is typically a patulous inferior capsule. An inferior capsular shift addresses this redundant inferior pouch, decreasing inferior translation and global laxity.
Question 3482
Topic: 9. Shoulder and Elbow
A 62-year-old male with a massive, irreparable posterosuperior rotator cuff tear and no glenohumeral arthritis undergoes superior capsular reconstruction (SCR). What is the primary biomechanical goal of this procedure?
Correct Answer & Explanation
. Depress the humeral head to restore the glenohumeral force couple
Explanation
The primary biomechanical goal of SCR is to act as a static restraint against superior humeral head migration. Depressing the humeral head restores the coronal plane force couple, thereby improving the mechanical advantage and efficiency of the intact deltoid.
Question 3483
Topic: 9. Shoulder and Elbow
A 65-year-old male presents with pseudoparalysis of the shoulder and an irreparable massive posterosuperior rotator cuff tear. Radiographs show Hamada Grade 4 changes. Which is the most appropriate surgical treatment?
Correct Answer & Explanation
. Reverse total shoulder arthroplasty
Explanation
Reverse total shoulder arthroplasty is the treatment of choice for a patient with cuff tear arthropathy (Hamada 4) and pseudoparalysis. It utilizes the deltoid to elevate the arm by medializing and distalizing the center of rotation.
Question 3484
Topic: 9. Shoulder and Elbow
In evaluating a patient with suspected glenohumeral instability, which ligamentous structure serves as the primary restraint to inferior translation of the humerus when the shoulder is abducted to 90 degrees?
Correct Answer & Explanation
. Inferior glenohumeral ligament complex
Explanation
The inferior glenohumeral ligament (IGHL) complex is the primary static stabilizer against anterior, posterior, and inferior translation when the shoulder is abducted to 90 degrees. The superior glenohumeral and coracohumeral ligaments resist inferior translation when the arm is adducted.
Question 3485
Topic: 9. Shoulder and Elbow
A 65-year-old patient presents with an irreparable massive rotator cuff tear, pseudoparalysis of the shoulder (active elevation less than 90 degrees), and an intact deltoid. Radiographs show Hamada grade 3 changes. What is the most appropriate definitive surgical management?
Correct Answer & Explanation
. Reverse total shoulder arthroplasty
Explanation
Reverse total shoulder arthroplasty relies on the intact deltoid to elevate the arm and is the treatment of choice for rotator cuff arthropathy with pseudoparalysis. Superior capsular reconstruction is contraindicated in the presence of arthritis and pseudoparalysis.
Question 3486
Topic: Shoulder Pathology
A patient presents with a winged scapula following a posterior triangle lymph node biopsy. The injured nerve is derived from which roots of the brachial plexus?
Correct Answer & Explanation
. C5, C6
Explanation
Winging of the scapula with medial deviation is typically due to a long thoracic nerve injury resulting in serratus anterior paralysis. The long thoracic nerve is formed directly by the ventral rami of C5, C6, and C7 before they form the trunks of the brachial plexus.
Question 3487
Topic: Elbow & Forearm
Posterolateral rotatory instability (PLRI) of the elbow primarily results from incompetence of the lateral ulnar collateral ligament (LUCL). What are the exact origin and insertion of the LUCL?
Correct Answer & Explanation
. Lateral epicondyle to the supinator crest of the ulna
Explanation
The lateral ulnar collateral ligament (LUCL) originates on the lateral epicondyle of the humerus, blends with the annular ligament, and inserts on the supinator crest of the proximal ulna. It acts as a posterior sling for the radial head, preventing posterolateral subluxation.
Question 3488
Topic: 9. Shoulder and Elbow
A 24-year-old male sustains a stab wound to the axilla. Neurological examination reveals complete transaction of the posterior cord of the brachial plexus. Which of the following muscular functions would remain completely intact?
Correct Answer & Explanation
. Shoulder adduction via the pectoralis major clavicular head
Explanation
The posterior cord gives rise to the upper/lower subscapular nerves, thoracodorsal nerve, axillary nerve, and radial nerve. Therefore, latissimus dorsi, subscapularis, deltoid (abduction), and triceps (extension) are affected. The clavicular head of the pectoralis major is innervated by the lateral pectoral nerve (from the lateral cord) and would remain intact.
Question 3489
Topic: 9. Shoulder and Elbow
The rotator interval is a triangular anatomical space in the anterosuperior shoulder that must often be closed during instability surgery. Which of the following structures is NOT considered part of the borders or contents of the rotator interval?
Correct Answer & Explanation
. Inferior glenohumeral ligament
Explanation
The rotator interval is bordered superiorly by the anterior margin of the supraspinatus, inferiorly by the superior margin of the subscapularis, and medially by the coracoid base. Its contents include the coracohumeral ligament (CHL), superior glenohumeral ligament (SGHL), and long head of the biceps tendon. The inferior glenohumeral ligament (IGHL) is located inferiorly and is not part of the interval.
Question 3490
Topic: 9. Shoulder and Elbow
Which of the following structures is NOT considered a normal content or border of the rotator interval of the shoulder?
Correct Answer & Explanation
. Coracohumeral ligament
Explanation
The rotator interval is a triangular space bordered superiorly by the anterior margin of the supraspinatus, inferiorly by the superior margin of the subscapularis, medially by the coracoid base, and laterally by the transverse humeral ligament. Its contents include the coracohumeral ligament (CHL), superior glenohumeral ligament (SGHL), and the long head of the biceps tendon. The middle glenohumeral ligament (MGHL) is an intra-articular structure located inferior to the rotator interval.
Question 3491
Topic: Elbow & Forearm
A surgeon utilizes a modified 2-incision (Mayo) approach for a distal biceps tendon repair. During the creation of the posterior window to retrieve and attach the tendon to the radial tuberosity, which of the following maneuvers is critical to prevent nerve injury?
Correct Answer & Explanation
. Maximal pronation to protect the posterior interosseous nerve
Explanation
In the modified 2-incision approach for a distal biceps repair, creating the posterior window (splitting the extensor carpi radialis brevis and extensor digitorum communis, or passing through the supinator) places the posterior interosseous nerve (PIN) at risk. The arm must be placed in maximal pronation; this rotates the radius and pulls the PIN medially, safely away from the posterior surgical field.
Question 3492
Topic: 9. Shoulder and Elbow
During a standard deltopectoral approach to the shoulder, the cephalic vein is identified within the intermuscular groove. According to classic orthopedic principles, which of the following represents the safest management of the cephalic vein during deeper retraction?
Correct Answer & Explanation
. Retract laterally to preserve venous branches from the deltoid
Explanation
Classic orthopedic teaching advocates retracting the cephalic vein laterally along with the deltoid muscle during a deltopectoral approach. The rationale is that the majority of the tributary venous branches to the cephalic vein come from the deltoid; retracting the vein medially would tear these branches, leading to troublesome bleeding.
Question 3493
Topic: Elbow & Forearm
In a pediatric patient, understanding the chronological appearance of secondary ossification centers around the elbow is critical for accurately interpreting radiographs. According to the well-known CRITOE mnemonic, which of the following ossification centers appears last?
Correct Answer & Explanation
. External (lateral) epicondyle
Explanation
The secondary ossification centers of the pediatric elbow appear in a predictable sequence represented by the mnemonic CRITOE: Capitellum (1 year), Radial head (3 years), Internal (medial) epicondyle (5 years), Trochlea (7 years), Olecranon (9 years), and External (lateral) epicondyle (11 years). Thus, the lateral epicondyle is the last to appear.
Question 3494
Topic: Shoulder Pathology
A patient with HME presents with an osteochondroma in the scapula. What unique functional impairment might be caused by this specific location?
Correct Answer & Explanation
. Scapular winging or limited shoulder range of motion
Explanation
Osteochondromas in the scapula or periscapular region can cause significant functional impairment, including mechanical obstruction leading to scapular winging, limited shoulder range of motion (especially abduction and rotation), pain, and snapping scapula syndrome. Genu valgum and foot drop are lower extremity issues. Radial nerve palsy is an upper extremity nerve compression but less typical for scapular lesions compared to direct mechanical restriction.
Question 3495
Topic: 9. Shoulder and Elbow
A 55-year-old male former professional baseball pitcher presents with 3 years of progressive right elbow pain, stiffness, and occasional locking. His pain is worse with activity and he notes difficulty with full extension and flexion. Physical examination reveals a flexion contracture of 20 degrees and further flexion to 120 degrees, with crepitus throughout the range of motion. Ulnar nerve symptoms are intermittently present. Radiographs show extensive osteophyte formation on the olecranon and coronoid fossae, along with capitellar and trochlear spurring. There is also evidence of loose bodies. What is the most appropriate initial surgical management for this patient?
Correct Answer & Explanation
. Open debridement with osteophyte excision and loose body removal
Explanation
This patient presents with classic symptoms and radiographic findings of primary elbow osteoarthritis, likely exacerbated by his history as a professional pitcher. Given the progressive pain, stiffness, mechanical symptoms (locking), and specific radiographic findings of osteophytes and loose bodies, open debridement with osteophyte excision and loose body removal is the most appropriate initial surgical intervention. This procedure aims to restore motion, reduce pain, and address mechanical impingement. Total elbow arthroplasty (TEA) is typically reserved for severe, end-stage osteoarthritis, particularly in older, low-demand patients, and is not indicated as an initial approach for a patient of this age and activity level unless conservative measures and debridement have failed. Ulnar nerve transposition may be part of the procedure if persistent ulnar neuropathy is present after debridement, but it is not the primary intervention for the OA itself. Radial head excision is indicated for radiocapitellar arthritis or specific fracture patterns, not the comprehensive OA described. Distraction arthroplasty is a less common salvage procedure for severe cases, also not initial management.
Question 3496
Topic: 9. Shoulder and Elbow
Which of the following is the most significant differentiating factor between primary and post-traumatic elbow osteoarthritis?
Correct Answer & Explanation
. History of previous elbow fracture or dislocation
Explanation
While osteophytes, flexion contracture, loose bodies, and pain with activity are common features of both primary and post-traumatic elbow osteoarthritis, the history of a previous elbow fracture or dislocation is the definitive distinguishing factor for post-traumatic OA. Primary OA typically develops without a clear inciting traumatic event, though repetitive microtrauma (e.g., in athletes) can contribute. All other options describe symptoms or radiographic findings that can be present in both forms of OA. Therefore, the patient's history is crucial for accurate classification.
Question 3497
Topic: 9. Shoulder and Elbow
Regarding the pathophysiology of elbow osteoarthritis, which statement is most accurate?
Correct Answer & Explanation
. Mechanical stress on the articular cartilage leads to chondrocyte death and matrix degradation.
Explanation
Elbow osteoarthritis, like OA in other joints, is primarily a degenerative condition characterized by the progressive loss of articular cartilage, subchondral bone changes, and osteophyte formation. The mechanical stress on the articular cartilage, particularly in high-demand or post-traumatic elbows, leads to chondrocyte dysfunction, apoptosis (death), and the degradation of the extracellular matrix, which is rich in Type II collagen, not Type I. Synovial inflammation (synovitis) is often present and can exacerbate cartilage degradation through the release of inflammatory mediators, but it is typically considered a secondary response to the cartilage breakdown products rather than the primary initiating event in most cases of non-inflammatory OA. Osteophyte formation is a compensatory but ultimately detrimental process that restricts joint motion and can contribute significantly to pain and stiffness by causing impingement. OA is not primarily an inflammatory autoimmune process, though inflammatory components can be present.
Question 3498
Topic: 9. Shoulder and Elbow
In evaluating a patient with suspected elbow osteoarthritis, which physical exam finding is most indicative of significant posterior impingement?
Correct Answer & Explanation
. Pain and mechanical block at terminal elbow extension
Explanation
Pain and a mechanical block at terminal elbow extension are classic signs of posterior impingement due to osteophyte formation on the olecranon and in the olecranon fossa. These osteophytes physically block the olecranon from fully entering the fossa. Pain with resisted wrist extension suggests lateral epicondylitis. Crepitus with forearm rotation points to radiocapitellar involvement. Weakness of intrinsic hand muscles indicates ulnar nerve compromise, which can be associated with elbow OA but is not directly a sign of posterior impingement. Tenderness over the medial epicondyle suggests medial epicondylitis or medial collateral ligament pathology, not specifically posterior impingement of the elbow joint.
Question 3499
Topic: 9. Shoulder and Elbow
A 72-year-old sedentary female presents with severe, end-stage, tricompartmental elbow osteoarthritis. She has failed all conservative measures, including corticosteroid injections and physical therapy. Her radiographs demonstrate complete loss of joint space, significant osteophyte formation, and subchondral sclerosis. She reports excruciating pain at rest and with minimal activity. She is a suitable candidate for a Total Elbow Arthroplasty (TEA). Which of the following elbow implant types is generally favored for this patient population with severe OA?
Correct Answer & Explanation
. Linked, semiconstrained implant
Explanation
For severe, end-stage tricompartmental elbow osteoarthritis, especially in a sedentary, older patient who presents with significant pain and bone loss, a linked, semiconstrained total elbow arthroplasty (TEA) is generally the favored implant type. Linked semiconstrained implants provide inherent stability, which is crucial when there is significant bone loss and ligamentous incompetence often seen in advanced OA. Unlinked implants rely heavily on intact collateral ligaments for stability, which may be compromised in severe OA. Resurfacing implants are typically used for more focal cartilage defects or in younger, higher-demand patients for whom preserving bone stock is paramount. Radial head replacement and hemiarthroplasty of the trochlea are not options for tricompartmental elbow OA.
Question 3500
Topic: 9. Shoulder and Elbow
A 40-year-old male presents with persistent elbow pain and stiffness refractory to conservative management, following an old capitellar fracture that healed with mild incongruity. Radiographs show isolated radiocapitellar osteoarthritis with preserved ulnohumeral joint space. What is the most appropriate surgical management for this patient?
Correct Answer & Explanation
. Total elbow arthroplasty
Explanation
For isolated radiocapitellar osteoarthritis, especially in a younger, active patient, radial head excision is a well-established and effective treatment. It typically relieves pain, improves forearm rotation, and can improve overall elbow motion. It is generally contraindicated in cases of proximal migration of the radius or concomitant elbow instability. Total elbow arthroplasty is excessive for isolated radiocapitellar OA. Ulnohumeral interposition arthroplasty or osteophyte excision of the olecranon and coronoid would address the ulnohumeral joint, which is described as preserved. Arthroscopic capsular release primarily addresses stiffness due to capsular contracture, not articular cartilage loss and pain from radiocapitellar OA.
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