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Question 881

Topic: Elbow & Forearm

A 28-year-old male sustained a midshaft humerus fracture 6 months ago resulting in a complete radial nerve palsy with no signs of recovery on recent EMG. For surgical reconstruction, a tendon transfer is planned. The pronator teres (PT) is most commonly transferred to which structure to restore wrist extension?

. Extensor carpi radialis longus (ECRL)
. Extensor carpi radialis brevis (ECRB)
. Extensor digitorum communis (EDC)
. Extensor carpi ulnaris (ECU)
. Extensor pollicis longus (EPL)

Correct Answer & Explanation

. Extensor carpi radialis brevis (ECRB)


Explanation

In the management of high radial nerve palsy, the pronator teres (PT) is classically transferred to the extensor carpi radialis brevis (ECRB) to restore wrist extension. Transferring to the ECRB is preferred over the ECRL because the ECRB inserts at the base of the third metacarpal, providing central wrist extension, whereas ECRL insertion on the second metacarpal tends to produce unwanted radial deviation.

Question 882

Topic: Elbow & Forearm

In a patient with an irreversible high radial nerve palsy, multiple tendon transfers are planned. What is the standard transfer utilized to restore active wrist extension?

. Flexor carpi ulnaris (FCU) to extensor digitorum communis (EDC)
. Pronator teres (PT) to extensor carpi radialis brevis (ECRB)
. Pronator teres (PT) to extensor carpi radialis longus (ECRL)
. Flexor carpi radialis (FCR) to extensor digitorum communis (EDC)
. Palmaris longus (PL) to extensor pollicis longus (EPL)

Correct Answer & Explanation

. Pronator teres (PT) to extensor carpi radialis brevis (ECRB)


Explanation

The most widely accepted tendon transfer for restoring wrist extension in radial nerve palsy is the pronator teres to the ECRB. The ECRB is chosen over the ECRL because its central insertion provides a more balanced wrist extension without excessive radial deviation.

Question 883

Topic: Elbow & Forearm

A 42-year-old female sustains a "terrible triad" injury of the elbow. She is taken to the operating room for definitive fixation. To optimize stability and clinical outcomes, what is the generally recommended sequence of surgical reconstruction?

. Lateral collateral ligament (LCL) repair, followed by radial head, followed by coronoid
. Radial head fixation/replacement, followed by coronoid, followed by LCL repair
. Coronoid fixation, followed by radial head fixation/replacement, followed by LCL repair
. Medial collateral ligament (MCL) repair, followed by coronoid, followed by radial head
. Coronoid fixation, followed by LCL repair, followed by radial head

Correct Answer & Explanation

. Lateral collateral ligament (LCL) repair, followed by radial head, followed by coronoid


Explanation

The standard surgical algorithm for a terrible triad injury works from deep to superficial and medial to lateral (if via lateral approach): (1) Coronoid fixation or anterior capsule repair to restore anterior stability, (2) Radial head fixation or replacement to restore the anterior and valgus buttress, (3) Lateral collateral ligament (LUCL) repair to the lateral epicondyle to restore posterolateral rotatory stability. The MCL is only repaired if the elbow remains unstable after these steps.

Question 884

Topic: Elbow & Forearm

A 50-year-old female falls onto an outstretched hand and sustains an isolated coronal shear fracture of the capitellum. Radiographs reveal a large osseous fragment consisting of the capitellum and the lateral half of the trochlea without posterior comminution. According to the Dubberley classification, what type of fracture is this?

. Type 1A
. Type 2A
. Type 3A
. Type 1B
. Type 2B

Correct Answer & Explanation

. Type 1A


Explanation

The Dubberley classification of capitellum fractures: Type 1 involves the capitellum only. Type 2 involves the capitellum and trochlea as a single articular fragment. Type 3 involves the capitellum and trochlea as separate fragments. Subtype A lacks posterior wall comminution, whereas Subtype B has posterior condylar comminution. A single fragment with capitellum and trochlea, without posterior comminution, is a Type 2A.

Question 885

Topic: Elbow & Forearm

A 40-year-old weightlifter feels a pop in his elbow while doing heavy curls. Physical examination demonstrates a positive Hook test. When repairing a distal biceps tendon rupture using a single anterior incision approach, which nerve is at highest risk of injury?

. Median nerve
. Ulnar nerve
. Posterior interosseous nerve (PIN)
. Lateral antebrachial cutaneous nerve (LABCN)
. Superficial radial nerve

Correct Answer & Explanation

. Median nerve


Explanation

The lateral antebrachial cutaneous nerve (LABCN) runs in the subcutaneous tissue over the lateral aspect of the antecubital fossa and is the most commonly injured nerve during a single-incision distal biceps repair. The PIN is more at risk in a two-incision approach or with deep retractor placement.

Question 886

Topic: Elbow & Forearm

A 35-year-old male bodybuilder feels a 'pop' in his anterior elbow during a deadlift. Examination reveals a positive hook test. If an anterior single-incision surgical repair using cortical button fixation is chosen, which nerve is at the highest risk of iatrogenic injury?

. Median nerve
. Ulnar nerve
. Posterior interosseous nerve (PIN)
. Lateral antebrachial cutaneous nerve (LABCN)
. Superficial radial nerve

Correct Answer & Explanation

. Median nerve


Explanation

The lateral antebrachial cutaneous nerve (LABCN) is the most commonly injured nerve during a single-incision anterior approach for distal biceps repair due to its superficial location in the surgical field. PIN injury is more classically associated with the two-incision technique.

Question 887

Topic: Elbow & Forearm

A 35-year-old male sustains an acute distal biceps tendon rupture and undergoes surgical repair via a classic two-incision approach. Which of the following complications is more commonly associated with this technique compared to a single anterior incision approach?

. Lateral antebrachial cutaneous nerve palsy
. Proximal radioulnar synostosis
. Posterior interosseous nerve injury
. Median nerve neuropraxia
. Tendon re-rupture

Correct Answer & Explanation

. Lateral antebrachial cutaneous nerve palsy


Explanation

The classic two-incision approach for distal biceps repair increases the risk of heterotopic ossification and proximal radioulnar synostosis due to subperiosteal elevation around the ulna. The single anterior incision carries a higher risk of lateral antebrachial cutaneous (LABC) neuropraxia.

Question 888

Topic: Elbow & Forearm
A 6-year-old girl sustained a Gartland III supracondylar humerus fracture that was managed non-operatively. She develops a severe malunion. If a persistent cubitus varus deformity (gunstock deformity) remains, what is the most significant long-term clinical consequence aside from the cosmetic appearance?
. Ulnar neuropathy and tardy posterolateral rotatory instability (PLRI)
. Median neuropathy and tardy posteromedial rotatory instability (PMRI)
. Recurrent radial nerve entrapment
. High incidence of recurrent supracondylar fractures
. Avascular necrosis of the trochlea

Correct Answer & Explanation

. Ulnar neuropathy and tardy posterolateral rotatory instability (PLRI)


Explanation

Cubitus varus is historically considered a largely cosmetic issue with minimal functional deficit in childhood. However, in adulthood, it alters the triceps vector, causing chronic lateral ulnar collateral ligament (LUCL) attenuation, leading to tardy posterolateral rotatory instability (PLRI) and snapping of the medial head of the triceps, which can cause ulnar neuritis/neuropathy.

Question 889

Topic: Elbow & Forearm

A 35-year-old male sustains a midshaft humerus fracture. Examination reveals an inability to extend the wrist and digits. He is diagnosed with a radial nerve palsy. If tendon transfers are required due to lack of recovery, which of the following combinations is the classic Boyes transfer for radial nerve palsy?

. Pronator teres to ECRB; FCU to EDC; Palmaris longus to EPL
. Pronator teres to ECRB; FDS of ring finger to EPL; FDS of middle finger to EDC; FCR to APL/EPB
. Pronator teres to ECRB; FCR to EDC; Palmaris longus to EPL
. FCU to ECRB; FCR to EDC; FDS to EPL
. Brachioradialis to ECRB; FCR to EDC; Palmaris longus to EPL

Correct Answer & Explanation

. Pronator teres to ECRB; FCU to EDC; Palmaris longus to EPL


Explanation

The Boyes transfer utilizes the Pronator Teres (PT) to Extensor Carpi Radialis Brevis (ECRB) for wrist extension, Flexor Digitorum Superficialis (FDS) of the middle finger to Extensor Digitorum Communis (EDC) for finger extension, FDS of the ring finger to Extensor Pollicis Longus (EPL) for thumb extension, and Flexor Carpi Radialis (FCR) to Abductor Pollicis Longus (APL) and Extensor Pollicis Brevis (EPB). In contrast, the more common standard (Jones) transfer uses PT to ECRB, FCU to EDC, and Palmaris Longus to EPL.

Question 890

Topic: Elbow & Forearm

A patient sustained a humerus fracture resulting in a persistent high radial nerve palsy. When planning a standard set of tendon transfers to restore function, which muscle is typically transferred to the extensor carpi radialis brevis (ECRB) to restore wrist extension?

. Pronator teres
. Flexor carpi ulnaris
. Flexor digitorum superficialis
. Palmaris longus
. Flexor carpi radialis

Correct Answer & Explanation

. Pronator teres


Explanation

In a standard radial nerve palsy tendon transfer (e.g., Jones transfer), the pronator teres is transferred to the ECRB to restore wrist extension. The FCU or FCR is typically transferred to the EDC for finger extension.

Question 891

Topic: Elbow & Forearm

In a patient undergoing tendon transfers for a high radial nerve palsy, the pronator teres (PT) is typically transferred to restore wrist extension. Why is the extensor carpi radialis brevis (ECRB) preferred as the recipient tendon over the extensor carpi radialis longus (ECRL)?

. The ECRB has a longer excursion than the ECRL.
. The ECRB is functionally stronger due to a larger cross-sectional area.
. The ECRB is innervated by the posterior interosseous nerve.
. The ECRB provides centralized wrist extension without excessive radial deviation.
. The ECRB tendon is located more superficially, easing the transfer.

Correct Answer & Explanation

. The ECRB has a longer excursion than the ECRL.


Explanation

The ECRB inserts at the base of the third metacarpal, allowing for centralized wrist extension. Transferring to the ECRL, which inserts on the second metacarpal, would cause excessive radial deviation during wrist extension.

Question 892

Topic: Elbow & Forearm

A patient with a chronic, irreparable high radial nerve palsy is undergoing tendon transfers to restore wrist, finger, and thumb extension. The surgeon plans to transfer the Pronator Teres to the Extensor Carpi Radialis Brevis (PT to ECRB) for wrist extension, and the Flexor Carpi Radialis to the Extensor Digitorum Communis (FCR to EDC) for finger extension. What is the standard tendon transfer utilized in this set to restore thumb extension (EPL)?

. Flexor carpi ulnaris (FCU) to EPL
. Palmaris longus (PL) to EPL
. Flexor digitorum superficialis (FDS) of ring finger to EPL
. Brachioradialis (BR) to EPL
. Extensor indicis proprius (EIP) to EPL

Correct Answer & Explanation

. Flexor carpi ulnaris (FCU) to EPL


Explanation

The standard set of tendon transfers for a high radial nerve palsy (the Boyes or standard Jones transfer set variations) commonly uses the Pronator Teres (PT) to ECRB for wrist extension, the Flexor Carpi Radialis (FCR) or Flexor Carpi Ulnaris (FCU) to the EDC for finger extension, and the Palmaris Longus (PL) rerouted to the Extensor Pollicis Longus (EPL) to restore thumb extension.

Question 893

Topic: Elbow & Forearm

A 35-year-old male sustained a mid-shaft humerus fracture resulting in an irreparable radial nerve palsy. He is undergoing a classic 'standard' (Jones) tendon transfer to restore function. In this specific transfer arrangement, which muscle is most commonly transferred to the extensor pollicis longus (EPL) to restore thumb extension?

. Flexor carpi radialis (FCR)
. Flexor digitorum superficialis (FDS)
. Palmaris longus (PL)
. Pronator teres (PT)
. Flexor carpi ulnaris (FCU)

Correct Answer & Explanation

. Flexor carpi radialis (FCR)


Explanation

In the standard (Jones) tendon transfer for radial nerve palsy, the palmaris longus (PL) is transferred to the EPL to restore thumb extension. The pronator teres (PT) is transferred to the ECRB to restore wrist extension, and the flexor carpi radialis (FCR) is transferred to the EDC to restore digit extension.

Question 894

Topic: Elbow & Forearm

In a patient with a high radial nerve palsy undergoing tendon transfers, the pronator teres (PT) is most commonly transferred to which of the following tendons to restore functional wrist extension?

. Extensor carpi radialis brevis (ECRB)
. Extensor carpi radialis longus (ECRL)
. Extensor carpi ulnaris (ECU)
. Extensor digitorum communis (EDC)
. Extensor pollicis longus (EPL)

Correct Answer & Explanation

. Extensor carpi radialis brevis (ECRB)


Explanation

In standard tendon transfer operations for radial nerve palsy (such as the Jones, Boyes, or Brand transfers), the pronator teres is transferred to the ECRB. The ECRB is preferred over the ECRL because its central location provides more balanced wrist extension without excessive radial deviation.

Question 895

Topic: Elbow & Forearm

A 32-year-old male presents with an irreversible high radial nerve palsy following a humerus fracture. To restore wrist extension, which tendon transfer is most commonly utilized and provides the best biomechanical advantage?

. Flexor carpi ulnaris (FCU) to extensor carpi radialis brevis (ECRB)
. Pronator teres (PT) to extensor carpi radialis brevis (ECRB)
. Flexor digitorum superficialis (FDS) to extensor digitorum communis (EDC)
. Palmaris longus (PL) to extensor pollicis longus (EPL)
. Flexor carpi radialis (FCR) to extensor carpi radialis longus (ECRL)

Correct Answer & Explanation

. Flexor carpi ulnaris (FCU) to extensor carpi radialis brevis (ECRB)


Explanation

The pronator teres to ECRB transfer is the gold standard for restoring wrist extension in radial nerve palsy. The ECRB is preferred over the ECRL as it provides more central wrist extension and avoids excessive radial deviation.

Question 896

Topic: Elbow & Forearm

A surgeon is planning a lateral collateral ligament (LCL) reconstruction for a patient with severe posterolateral rotatory instability (PLRI) of the elbow.

The lateral ulnar collateral ligament (LUCL), the primary restraint to PLRI, originates on the lateral epicondyle and inserts on which of the following structures?

. Radial tuberosity
. Coronoid process of the ulna
. Supinator crest of the ulna
. Annular ligament
. Olecranon process

Correct Answer & Explanation

. Radial tuberosity


Explanation

The lateral ulnar collateral ligament (LUCL) is the primary isometric stabilizer against PLRI. It originates from the lateral epicondyle and inserts onto the supinator crest of the proximal ulna.

Question 897

Topic: Elbow & Forearm

A 25-year-old male undergoes open reduction and internal fixation for a pronation-external rotation (PER) ankle fracture. After fibular plating and medial malleolus fixation, a 'hook test' (Cotton test) is performed intraoperatively, demonstrating 4 mm of lateral translation of the fibula relative to the tibia. What is the most appropriate next step?

. Accept the reduction, as 4 mm of translation is within normal physiologic limits
. Perform a primary repair of the deltoid ligament only
. Place a syndesmotic position screw or dynamic suture-button device
. Revise the fibular plate to a longer locking plate
. Perform a primary arthrodesis of the distal tibiofibular joint

Correct Answer & Explanation

. Accept the reduction, as 4 mm of translation is within normal physiologic limits


Explanation

A positive intraoperative hook test (Cotton test) demonstrating lateral translation of the fibula greater than 2-3 mm indicates ongoing syndesmotic instability despite bony fixation. The appropriate management is stabilization of the syndesmosis, utilizing either trans-syndesmotic position screws or dynamic suture-button devices.

Question 898

Topic: Elbow & Forearm

A 45-year-old female falls onto an outstretched hand and sustains a 'terrible triad' injury of the elbow. Which of the following describes the most widely accepted surgical sequence for reconstruction?

. Coronoid fixation, radial head repair/replacement, lateral collateral ligament (LCL) repair
. LCL repair, coronoid fixation, radial head repair/replacement
. Radial head repair/replacement, coronoid fixation, LCL repair
. Radial head repair/replacement, LCL repair, coronoid fixation
. Coronoid fixation, LCL repair, radial head repair/replacement

Correct Answer & Explanation

. Coronoid fixation, radial head repair/replacement, lateral collateral ligament (LCL) repair


Explanation

The standard sequence for reconstructing a terrible triad injury works from deep to superficial, and usually medial to lateral (if approached laterally). The sequence is fixation of the coronoid fracture first, followed by radial head repair or replacement, and finally repair of the lateral ulnar collateral ligament (LUCL).

Question 899

Topic: Elbow & Forearm

A 35-year-old male falls onto an outstretched hand, sustaining a severely comminuted radial head fracture, acute wrist pain, and instability of the distal radioulnar joint (DRUJ). The radial head is deemed unsalvageable. What is the most appropriate definitive management of the elbow in this patient?

. Excision of the radial head and early mobilization
. Excision of the radial head with ulnar shortening osteotomy
. Radial head arthroplasty
. Silicone radial head replacement
. Primary arthrodesis of the radiocapitellar joint

Correct Answer & Explanation

. Excision of the radial head and early mobilization


Explanation

This patient has an Essex-Lopresti injury, characterized by a radial head fracture, tearing of the interosseous membrane, and DRUJ disruption. Excision of the radial head is strictly contraindicated as it will lead to devastating proximal migration of the radius and chronic wrist pain. The correct management is radial head replacement (arthroplasty) with a metallic prosthesis to restore the lateral column length, along with addressing the DRUJ.

Question 900

Topic: Elbow & Forearm

A 50-year-old female falls onto her outstretched hand and presents with elbow pain. A lateral radiograph reveals a 'double arc sign'. What specific fracture pattern does this classic radiographic sign indicate?

. Radial head fracture with an associated coronoid tip fracture
. Coronal shear fracture involving the capitellum and the lateral trochlear ridge
. Anterior dislocation of the radial head with an intact ulna
. Olecranon fracture with comminution
. Supracondylar humerus fracture in an adult

Correct Answer & Explanation

. Radial head fracture with an associated coronoid tip fracture


Explanation

The 'double arc sign' on a true lateral radiograph of the elbow is pathognomonic for a Type IV (McKee modification of Bryan and Morrey) coronal shear fracture of the distal humerus. One arc represents the capitellum, and the second parallel arc represents the lateral ridge of the trochlea, which has been sheared off in continuity with the capitellum.