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 2021
Topic: Elbow & Forearm
A 35-year-old male falls on an outstretched hand and sustains a 'terrible triad' injury to the elbow. Operative management is planned. Following a standard deep-to-superficial surgical approach, what is the accepted sequence of structural repair to restore elbow stability?
Correct Answer & Explanation
. Coronoid, radial head, LUCL
Explanation
The standard sequence of repair for a terrible triad injury addresses structures from deep to superficial: first the coronoid, followed by the radial head, and finally the lateral ulnar collateral ligament (LUCL).
Question 2022
Topic: 9. Shoulder and Elbow
A 65-year-old woman with advanced rheumatoid arthritis presents with a massive, irreparable rotator cuff tear, severe glenohumeral osteoarthritis, and pseudoparalysis of the shoulder. Physical exam confirms an intact and functioning deltoid muscle.
Which of the following is the most appropriate definitive management?
Correct Answer & Explanation
. Reverse total shoulder arthroplasty (RTSA)
Explanation
Reverse total shoulder arthroplasty is the procedure of choice for cuff tear arthropathy with pseudoparalysis, provided the deltoid and axillary nerve are intact. Anatomic total shoulder arthroplasty is contraindicated due to the deficient rotator cuff.
Question 2023
Topic: 9. Shoulder and Elbow
A 19-year-old collegiate baseball pitcher presents with medial elbow pain during the late cocking phase of throwing. MRI arthrogram confirms a high-grade ulnar collateral ligament (UCL) tear. During UCL reconstruction (e.g., using the docking technique), the graft is primarily designed to replicate which specific structure?
Correct Answer & Explanation
. Anterior bundle of the UCL
Explanation
The anterior bundle of the UCL is the primary restraint to valgus stress at the elbow, particularly from 30 to 120 degrees of flexion. UCL reconstruction techniques are designed to recreate the biomechanical function of this specific bundle.
Question 2024
Topic: Elbow & Forearm
A 24-year-old male sustains a posterior elbow dislocation. After closed reduction, the elbow is stable in 90 degrees of flexion but immediately subluxates when extended with the forearm in supination. This specific pattern of instability indicates insufficiency of which of the following structures?
Correct Answer & Explanation
. Lateral ulnar collateral ligament (LUCL)
Explanation
Posterolateral rotatory instability (PLRI) occurs due to insufficiency of the lateral ulnar collateral ligament (LUCL). It typically manifests as subluxation or dislocation when the elbow is extended, supinated, and subjected to an axial load or valgus force.
Question 2025
Topic: 9. Shoulder and Elbow
A 72-year-old woman presents with chronic right shoulder pain and an inability to raise her arm above the horizontal plane. Physical examination reveals active forward elevation to 40 degrees and passive elevation to 150 degrees. Radiographs demonstrate superior migration of the humeral head with articulation against the acromion
. Which of the following is the most appropriate surgical treatment?
Correct Answer & Explanation
. Reverse total shoulder arthroplasty
Explanation
This patient has rotator cuff arthropathy with pseudoparalysis (active elevation less than 90 degrees with preserved passive motion). Reverse total shoulder arthroplasty is the treatment of choice as it shifts the center of rotation medially and inferiorly, allowing the deltoid to effectively elevate the arm.
Question 2026
Topic: Elbow & Forearm
A 42-year-old woman falls on an outstretched hand and sustains a "terrible triad" injury of the elbow. Which of the following structures is the primary restraint to posterolateral rotatory instability (PLRI) and must be meticulously repaired or reconstructed during surgery?
Correct Answer & Explanation
. Lateral ulnar collateral ligament (LUCL)
Explanation
The lateral ulnar collateral ligament (LUCL) is the primary restraint to posterolateral rotatory instability. In a terrible triad injury, the LUCL is typically avulsed from the lateral epicondyle and must be repaired to restore elbow stability.
Question 2027
Topic: 9. Shoulder and Elbow
A 45-year-old man complains of elbow pain and a "clunking" sensation when pushing himself out of a chair. On examination, a positive pivot-shift test of the elbow is elicited. Which mechanism of injury is most commonly associated with this specific condition?
Correct Answer & Explanation
. Axial compression, valgus stress, and supination
Explanation
The patient has posterolateral rotatory instability (PLRI) due to lateral ulnar collateral ligament (LUCL) insufficiency. The classic mechanism of injury is a fall on the outstretched hand resulting in axial load, valgus stress, and forearm supination.
Question 2028
Topic: Elbow & Forearm
A 44-year-old weightlifter sustained an acute complete distal biceps tendon rupture and underwent surgical repair using a two-incision technique. Postoperatively, he has profound restriction of forearm pronation and supination but full elbow flexion and extension. What is the most likely complication responsible for his restricted motion?
The two-incision technique for distal biceps tendon repair has historically carried a higher risk of radioulnar synostosis (heterotopic ossification bridging the radius and ulna) compared to the single-incision technique. This complication directly causes profound loss of forearm rotation.
Question 2029
Topic: 9. Shoulder and Elbow
A 55-year-old woman presents with a 6-month history of progressive, severe, global loss of both active and passive shoulder range of motion. She denies any preceding trauma. Which of the following systemic conditions is most strongly associated with the development and refractoriness of her most likely diagnosis?
Correct Answer & Explanation
. Diabetes mellitus
Explanation
This patient has idiopathic adhesive capsulitis (frozen shoulder). Diabetes mellitus is the strongest known systemic risk factor, associated with a higher incidence, bilateral involvement, and increased resistance to conservative treatments.
Question 2030
Topic: 9. Shoulder and Elbow
A 72-year-old female presents with severe right shoulder pain and an inability to actively elevate her arm above 40 degrees. Radiographs demonstrate superior migration of the humeral head with an acromiohumeral distance of 3 mm. Examination reveals intact deltoid function but positive lag signs. What is the most appropriate surgical treatment?
Correct Answer & Explanation
. Reverse total shoulder arthroplasty
Explanation
Reverse total shoulder arthroplasty is the treatment of choice for rotator cuff tear arthropathy in an elderly patient with intact deltoid function. The prosthesis medializes and distalizes the center of rotation, allowing the deltoid to effectively elevate the arm despite a deficient rotator cuff.
Question 2031
Topic: Elbow & Forearm
A 42-year-old male presents with a "terrible triad" injury of the elbow following a fall onto an outstretched hand. When performing the surgical reconstruction, what is the most widely accepted sequence of repair?
Correct Answer & Explanation
. Coronoid fixation followed by radial head fixation or replacement, and finally lateral collateral ligament (LCL) repair
Explanation
The terrible triad of the elbow involves an elbow dislocation with concomitant radial head and coronoid process fractures. The standard surgical sequence proceeds from deep to superficial: fixing the coronoid first, followed by the radial head, and finally repairing the lateral collateral ligament (LCL).
Question 2032
Topic: Elbow & Forearm
A 35-year-old bodybuilder feels a sudden pop in his anterior elbow during a heavy bicep curl. The hook test is positive. The surgeon utilizes a single-incision anterior approach to repair the distal biceps tendon. Which of the following nerves is at highest risk of iatrogenic injury with this specific approach?
Correct Answer & Explanation
. Lateral antebrachial cutaneous nerve
Explanation
The lateral antebrachial cutaneous nerve (LABCN) courses superficially in the lateral aspect of the antecubital fossa near the cephalic vein. It is the most commonly injured nerve during a single-incision anterior approach for distal biceps tendon repair, resulting in lateral forearm paresthesias.
Question 2033
Topic: 9. Shoulder and Elbow
A 45-year-old female sustains a coronal shear fracture of the capitellum that extends medially to include the majority of the trochlea (McKee modification Type IV). Open reduction and internal fixation with headless compression screws is planned. What is the most common complication following surgical management of this injury?
Correct Answer & Explanation
. Elbow stiffness
Explanation
Coronal shear fractures of the distal humerus involve significant intra-articular disruption and require extensive surgical exposure for accurate reduction. Consequently, post-traumatic elbow stiffness (loss of terminal extension) is the most frequently encountered postoperative complication.
Question 2034
Topic: Elbow & Forearm
A 42-year-old man falls from a height and sustains a complex elbow dislocation.
Imaging reveals a posterolateral elbow dislocation, a comminuted radial head fracture, and a type II coronoid fracture. During operative management, what is the most appropriate sequence of reconstruction?
Correct Answer & Explanation
. Coronoid fixation, radial head arthroplasty, LCL repair
Explanation
The standard surgical sequence for a terrible triad injury is from deep to superficial: coronoid fixation, followed by radial head replacement or fixation, and finally lateral collateral ligament (LCL) repair. This restores the anterior and lateral bony and ligamentous buttresses to prevent recurrent posterior subluxation.
Question 2035
Topic: Elbow & Forearm
A 45-year-old man undergoes a single-incision anterior approach for repair of an acute distal biceps tendon rupture. Postoperatively, he notes numbness along the lateral aspect of his forearm. Which nerve was most likely injured during the exposure?
Correct Answer & Explanation
. Lateral antebrachial cutaneous nerve
Explanation
The lateral antebrachial cutaneous nerve (LABC) is the most commonly injured structure during a single-incision anterior approach for distal biceps repair. The posterior interosseous nerve (PIN) is more at risk during a two-incision approach or when deep retractors are placed laterally.
Question 2036
Topic: Shoulder Arthroplasty & Arthritis
A 78-year-old woman with severe osteoporosis sustains a comminuted 4-part proximal humerus fracture. The humeral head is split, and the tuberosities are widely displaced. She is treated with a reverse total shoulder arthroplasty (RTSA). Healing of which structure is most critical to restore active external rotation?
Correct Answer & Explanation
. Greater tuberosity
Explanation
In RTSA for proximal humerus fractures, anatomic healing of the greater tuberosity is crucial for restoring active external rotation, as it serves as the attachment point for the infraspinatus and teres minor. Failure of greater tuberosity healing often results in a significant external rotation lag.
Question 2037
Topic: Elbow & Forearm
A 40-year-old weightlifter felt a sudden pop in his antecubital fossa and presents with weakness in supination. The Hook test is positive. If he undergoes a single-incision anterior approach for distal biceps tendon repair, which nerve is most at risk of injury?
Correct Answer & Explanation
. Lateral antebrachial cutaneous nerve
Explanation
The lateral antebrachial cutaneous nerve is the most frequently injured nerve during a single-incision anterior approach for distal biceps repair. The posterior interosseous nerve is more commonly at risk during a two-incision approach.
Question 2038
Topic: Elbow & Forearm
A 35-year-old woman falls on an outstretched hand, sustaining an elbow dislocation with associated fractures of the radial head and the coronoid process. During surgical reconstruction, what is the most widely accepted sequence of repair?
The standard surgical sequence for treating a terrible triad injury of the elbow is fixation of the coronoid first (to restore the anterior buttress), followed by radial head replacement or fixation, and finally repair of the lateral ulnar collateral ligament (LUCL).
Question 2039
Topic: Shoulder Arthroplasty & Arthritis
A 75-year-old osteoporotic woman sustains a displaced 4-part proximal humerus fracture. The articular surface is subluxated, and the tuberosities are widely displaced. Which treatment modality is associated with the most reliable return of forward elevation?
Correct Answer & Explanation
. Reverse total shoulder arthroplasty
Explanation
In elderly patients with severe osteoporosis and displaced 4-part proximal humerus fractures, reverse total shoulder arthroplasty (RTSA) provides more reliable pain relief and functional restoration than hemiarthroplasty or ORIF. It relies on deltoid function rather than predictable tuberosity healing.
Question 2040
Topic: 9. Shoulder and Elbow
A 40-year-old man falls onto an outstretched hand and sustains a 'terrible triad' injury of the elbow. He is taken to the operating room for surgical stabilization. After repairing the coronoid and stabilizing the radial head, the elbow remains unstable. According to the standard stepwise surgical protocol, which structure is typically addressed next?
Correct Answer & Explanation
. Lateral collateral ligament (LCL)
Explanation
The terrible triad of the elbow includes an elbow dislocation, radial head fracture, and coronoid fracture. The standard surgical sequence is coronoid fixation, radial head repair/replacement, LCL repair, and finally MCL repair or external fixation only if the elbow remains unstable.
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