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Surgical Anatomy & Approaches MCQs

Practice Set 11 of 102

This practice set contains high-yield board review questions covering key concepts in Surgical Anatomy & Approaches. Each clinical scenario is designed to test your diagnostic and management skills relevant to this subspecialty.

Question 201

Topic: Surgical Anatomy & Approaches

A 62-year-old female presents with a small, firm, tender lump at the site of a prior laparoscopic ventral hernia repair. She has no vomiting, distention, or obstipation but reports increasing localized pain. The surgeon suspects a Richter hernia.

What is the most appropriate initial surgical approach?

. Observation with pain control and bowel rest.
. Attempt manual reduction under conscious sedation.
. Urgent surgical exploration and repair.
. Prescribe broad-spectrum antibiotics and re-evaluate in 24 hours.
. Order a barium follow-through study to assess bowel patency.

Correct Answer & Explanation

. Urgent surgical exploration and repair.

Explanation

Correct Answer: CUrgent surgical exploration and repairis the most appropriate initial surgical approach for a suspected Richter hernia, especially when it is tender and firm. Richter hernias have a high risk of strangulation and perforation due to the tight constriction of the partially incarcerated bowel. Delay can lead to irreversible bowel damage, peritonitis, and sepsis. The absence of complete obstructive symptoms (vomiting, distention, obstipation) is characteristic of a Richter hernia but does not diminish the urgency of surgical intervention.Option A (Observation with pain control and bowel rest):Inappropriate for a suspected strangulated hernia; it would lead to dangerous delays.Option B (Attempt manual reduction under conscious sedation):Manual reduction is generally discouraged or performed with extreme caution in suspected strangulation, as it can reduce necrotic bowel into the abdomen or cause further injury.Option D (Prescribe broad-spectrum antibiotics and re-evaluate in 24 hours):Antibiotics are part of pre-operative management for suspected strangulation/perforation but do not replace the need for immediate surgical intervention.Option E (Order a barium follow-through study to assess bowel patency):Diagnostic studies that delay definitive treatment are inappropriate for a suspected surgical emergency.

Question 202

Topic: Surgical Anatomy & Approaches

For operative management of this navicular body fracture, the surgeon plans an open reduction and internal fixation. Which surgical approach is most commonly utilized for direct visualization and reduction of a navicular body fracture, as described in the case?

. A. Lateral approach between the peroneus brevis and tertius.
. B. Dorsal approach through the extensor retinaculum.
. C. Medial approach between the tibialis anterior and tibialis posterior tendons.
. D. Plantar approach to access the navicular from below.
. E. Posteromedial approach along the Achilles tendon.

Correct Answer & Explanation

. C. Medial approach between the tibialis anterior and tibialis posterior tendons.

Explanation

Correct Answer: CThe candidate explicitly states the surgical approach: 'I would use a medial approach, between the tibialis anterior and tibialis posterior tendons, preserving the remaining blood supply as much as possible, reduce the articular surface and stabilize with cannulated screws from lateral to medial.' This approach provides excellent access to the medial aspect of the navicular, which is crucial for reduction and fixation. Other approaches listed are either for different anatomical regions or do not provide optimal access to the navicular body.

Question 203

Topic: Surgical Anatomy & Approaches

A 29-year-old female undergoes operative fixation for a displaced, comminuted navicular body fracture. Which of the following is an early complication specifically mentioned in the context of operative management for this injury?

. A. Loss of medial longitudinal arch support.
. B. Post-traumatic osteoarthritis.
. C. Avascular necrosis.
. D. Nerve injury (e.g., superficial or deep peroneal nerves).
. E. Non-union.

Correct Answer & Explanation

. D. Nerve injury (e.g., superficial or deep peroneal nerves).

Explanation

Correct Answer: DThe candidate lists 'Early complications include infection, nerve injury (branches of superficial and deep peroneal nerves) and vascular injury (dorsalis pedis).' Nerve injury, particularly to the superficial or deep peroneal nerves, is a recognized early complication of foot and ankle surgery due to their anatomical proximity to surgical approaches and fracture sites. Options A, B, C, and E are all listed as potentiallatecomplications in the case.

Question 204

Topic: Surgical Anatomy & Approaches

A 40-year-old female undergoes open reduction and internal fixation of a comminuted mid-diaphyseal radial fracture using the volar (Henry) approach. During the deep dissection to expose the proximal and middle thirds of the radius, the surgeon must be particularly vigilant about protecting a specific nerve. Which of the following describes the most critical nerve to protect and its anatomical relationship during this approach?

. A. The ulnar nerve, which lies superficial to the flexor carpi ulnaris and is retracted laterally.
. B. The median nerve, which is found in the internervous plane between the brachioradialis and flexor carpi radialis.
. C. The posterior interosseous nerve (PIN), which courses within the substance of the supinator muscle and is protected by reflecting the supinator laterally.
. D. The radial nerve, which is retracted with the brachioradialis muscle laterally.
. E. The anterior interosseous nerve, which is typically found deep to the pronator quadratus and is at risk during distal exposure.

Correct Answer & Explanation

. C. The posterior interosseous nerve (PIN), which courses within the substance of the supinator muscle and is protected by reflecting the supinator laterally.

Explanation

Correct Answer: CThe teaching case details the Volar Henry approach: 'To expose the proximal third of the radius, the recurrent radial artery (the 'leash of Henry') must be identified, ligated, and divided. This allows the brachioradialis to be retracted laterally, exposing the supinator muscle. The supinator is sharply detached from its ulnar origin and reflected laterally. This maneuver protects the posterior interosseous nerve (PIN), which courses within the substance of the supinator.' This is the most critical nerve to protect during proximal exposure via the Henry approach.Option A is incorrect; the ulnar nerve is on the ulnar side of the forearm and not typically encountered in the primary dissection field of the Henry approach to the radius. Option B is incorrect; the median nerve is retracted ulnarly with the FCR, but the PIN is the nerve most at risk during the deeper dissection of the proximal radius. Option D is incorrect; the radial nerve innervates the brachioradialis, but the PIN is the branch of the radial nerve that is specifically vulnerable within the supinator. Option E is incorrect; while the anterior interosseous nerve (AIN) is a branch of the median nerve and can be at risk, the PIN is the primary nerve of concern when detaching and reflecting the supinator for proximal radial exposure in the Henry approach.

Question 205

Topic: Surgical Anatomy & Approaches

A 55-year-old male presents with a comminuted fracture of the proximal third of the radial diaphysis. The surgeon opts for a dorsal (Thompson) approach for open reduction and internal fixation. During the deep dissection, after incising the fascia and developing the interval between the ECRB and EDC, the supinator muscle is exposed. What is the most crucial step to prevent iatrogenic nerve injury during the subsequent exposure of the radial shaft?

. A. Retracting the brachioradialis muscle laterally to expose the radial artery.
. B. Carefully elevating the flexor pollicis longus and pronator quadratus from the volar surface.
. C. Identifying the posterior interosseous nerve (PIN) as it emerges from the supinator and protecting it by splitting the supinator along its course or elevating the muscle from ulnar to radial.
. D. Ligating and dividing the recurrent radial artery (leash of Henry) to allow for proximal retraction.
. E. Identifying and protecting the median nerve, which lies deep to the pronator teres.

Correct Answer & Explanation

. C. Identifying the posterior interosseous nerve (PIN) as it emerges from the supinator and protecting it by splitting the supinator along its course or elevating the muscle from ulnar to radial.

Explanation

Correct Answer: CThe teaching case describes the Dorsal Thompson approach: 'The supinator muscle is exposed. The critical step in this approach is the identification and protection of the PIN. The nerve emerges from the supinator approximately 1 cm proximal to the distal edge of the muscle. The supinator must be carefully split along the course of the nerve, or elevated off the radius from ulnar to radial, ensuring the nerve remains protected within the muscle belly during retraction.' This maneuver is paramount to avoid injury to the PIN.Options A, B, D, and E describe steps or anatomical structures relevant to other approaches or different parts of the forearm, or incorrect nerve relationships for the dorsal Thompson approach. Retracting the brachioradialis and exposing the radial artery (A) is part of the Henry approach. Elevating FPL and pronator quadratus (B) is for distal radial exposure, typically volar. Ligating the leash of Henry (D) is specific to the proximal Henry approach. Identifying the median nerve deep to pronator teres (E) is relevant to the Henry approach but not the primary concern for the PIN in the Thompson approach.

Question 206

Topic: Surgical Anatomy & Approaches

A surgeon utilizes the dorsal (Thompson) approach for open reduction and internal fixation of a proximal-third radial shaft fracture. Between which two muscles is the internervous plane developed?

. Extensor carpi radialis brevis and extensor digitorum communis
. Brachioradialis and pronator teres
. Flexor carpi ulnaris and extensor carpi ulnaris
. Extensor carpi radialis longus and brachioradialis
. Extensor digiti minimi and extensor carpi ulnaris

Correct Answer & Explanation

. Extensor carpi radialis brevis and extensor digitorum communis

Explanation

The dorsal Thompson approach exploits the internervous plane between the extensor carpi radialis brevis (innervated by the radial nerve) and the extensor digitorum communis (innervated by the posterior interosseous nerve).

Question 207

Topic: Surgical Anatomy & Approaches

A 45-year-old man undergoes ORIF of a diaphyseal radius fracture via the volar (Henry) approach. The internervous plane for the proximal portion of this surgical approach lies between which two nerves?

. Median and Ulnar
. Radial and Median
. Radial and Posterior Interosseous
. Musculocutaneous and Radial
. Ulnar and Anterior Interosseous

Correct Answer & Explanation

. Radial and Median

Explanation

The proximal internervous plane of the volar Henry approach to the forearm lies between the brachioradialis (innervated by the radial nerve) and the pronator teres (innervated by the median nerve).

Question 208

Topic: Surgical Anatomy & Approaches

A surgeon is using the posterolateral (Kocher) approach to access the radial head for an arthroplasty. To prevent denervation and safely expose the joint, the superficial internervous plane is developed between which two muscles?

. Extensor Carpi Radialis Brevis and Extensor Digitorum Communis
. Brachioradialis and Extensor Carpi Radialis Longus
. Supinator and Pronator Teres
. Anconeus and Extensor Carpi Ulnaris
. Flexor Carpi Ulnaris and Extensor Carpi Ulnaris

Correct Answer & Explanation

. Anconeus and Extensor Carpi Ulnaris

Explanation

The posterolateral (Kocher) approach to the radial head utilizes the internervous interval between the Anconeus (innervated by the radial nerve) and the Extensor Carpi Ulnaris (innervated by the posterior interosseous nerve).

Question 209

Topic: Surgical Anatomy & Approaches

When utilizing the volar (Henry) approach to the forearm for fixation of a distal radius diaphyseal fracture, which internervous plane is utilized?

. Between brachioradialis (radial n.) and pronator teres (median n.)
. Between flexor carpi radialis (median n.) and palmaris longus (median n.)
. Between brachioradialis (radial n.) and flexor carpi radialis (median n.)
. Between flexor digitorum superficialis (median n.) and flexor carpi ulnaris (ulnar n.)
. Between extensor carpi radialis brevis (radial n.) and extensor digitorum communis (PIN)

Correct Answer & Explanation

. Between brachioradialis (radial n.) and flexor carpi radialis (median n.)

Explanation

The distal interval of the volar Henry approach utilizes the internervous plane between the brachioradialis (radial nerve) and the flexor carpi radialis (median nerve). Proximally, the interval is between the brachioradialis and the pronator teres (median nerve).

Question 210

Topic: Surgical Anatomy & Approaches

A 14-year-old obese male presents with progressive unilateral left genu varum. Radiographs confirm adolescent Blount disease with a Medial Proximal Tibial Angle (MPTA) of 78 degrees and a Mechanical Axis Deviation (MAD) of 25 mm medial to the center of the knee. His skeletal age is 13 years, with open physes. Lateral hemiepiphysiodesis of the proximal tibia is planned. During the surgical approach to the lateral proximal tibia, which neurovascular structure is at highest risk of injury and requires meticulous attention, particularly with deep or misguided retraction?

. Popliteal artery
. Saphenous nerve
. Common peroneal nerve
. Anterior tibial artery
. Posterior tibial nerve

Correct Answer & Explanation

. Common peroneal nerve

Explanation

Correct Answer: CThe common peroneal nerve (C) courses superficially around the fibular neck, approximately 3-5 cm distal to the proximal tibial physis. During a lateral approach to the proximal tibia for hemiepiphysiodesis, aggressive or misguided deep retractors, especially those placed distally or posteriorly, can put this nerve at significant risk of stretch or direct injury, leading to a foot drop. The popliteal artery (A) and posterior tibial nerve (E) are located more posteriorly in the popliteal fossa and are less directly at risk with a lateral approach to the tibia, though deep posterior instrumentation could theoretically endanger them. The saphenous nerve (B) is a cutaneous nerve located more medially in the thigh and leg. The anterior tibial artery (D) passes through the interosseous membrane anteriorly and is generally not at direct risk during a lateral approach to the proximal tibia unless dissection is carried too deep and anteriorly.

Question 211

Topic: Surgical Anatomy & Approaches

During percutaneous iliosacral screw placement for a residual SI joint diastasis in a 30-year-old male, the surgeon notes a sudden increase in resistance during K-wire insertion into the S1 body, followed by a brief twitching of the patient's great toe. Which of the following neurological structures is most likely at risk of iatrogenic injury in this scenario?

. Femoral nerve
. Obturator nerve
. Lumbosacral plexus (S1 nerve root)
. Superior gluteal nerve
. Pudendal nerve

Correct Answer & Explanation

. Lumbosacral plexus (S1 nerve root)

Explanation

Correct Answer: CThe case content, under 'Complications & Management' and 'Neurological Injury,' explicitly warns about nerve injuries during iliosacral screw placement: 'For lumbosacral plexus/sciatic nerve (often with SI screw malposition or direct trauma).' The S1 nerve root is particularly vulnerable during S1 iliosacral screw placement, as it exits the S1 foramen. A 'twitching of the great toe' is a classic sign of S1 nerve root irritation or impingement, as the S1 nerve root contributes to plantarflexion and sensation in the foot, including the great toe.Option A (Femoral nerve)andOption B (Obturator nerve)are typically at risk with anterior approaches or acetabular fixation, not directly with posterior iliosacral screw placement into S1.Option D (Superior gluteal nerve)is at risk during open posterior approaches, particularly with extensive dissection around the greater sciatic notch, but less directly from a percutaneous S1 iliosacral screw trajectory unless the screw is significantly malpositioned laterally and superiorly.Option E (Pudendal nerve)is located more inferiorly and medially in the pelvis and is not typically at direct risk during S1 iliosacral screw placement.

Question 212

Topic: Surgical Anatomy & Approaches
A 40-year-old male with a Young-Burgess APC III pelvic fracture is undergoing definitive fixation. The surgeon plans to perform percutaneous iliosacral screw fixation for the posterior ring instability. Which of the following nerve roots is at the highest risk of iatrogenic injury during S1 iliosacral screw placement if the trajectory is too anterior or caudal?
. Femoral nerve.
. Obturator nerve.
. L5 nerve root.
. Sciatic nerve.
. Pudendal nerve.

Correct Answer & Explanation

. L5 nerve root.

Explanation

During percutaneous S1 iliosacral screw placement, the L5 nerve root is at the highest risk of iatrogenic injury. The L5 nerve root exits the sacrum through the L5-S1 foramen, which is located immediately anterior and slightly caudal to the typical entry point and trajectory for an S1 iliosacral screw. If the screw trajectory is too anterior, too caudal, or penetrates the anterior cortex of the sacrum, it can directly impinge upon or injure the L5 nerve root.

Question 213

Topic: Surgical Anatomy & Approaches

During an anterior intrapelvic (Stoppa) approach for acetabular/pelvic ring fixation, profuse bleeding occurs just posterior to the superior pubic ramus near the symphysis. This hemorrhage is most likely originating from an anastomosis between the external iliac system and which internal iliac branch?

. Superior gluteal artery
. Internal pudendal artery
. Inferior gluteal artery
. Obturator artery
. Middle sacral artery

Correct Answer & Explanation

. Obturator artery

Explanation

The corona mortis is a critical vascular anastomosis connecting the external iliac system (usually inferior epigastric) to the internal iliac system (usually the obturator artery or vein). It courses over the superior pubic ramus and is highly vulnerable during anterior pelvic approaches.

Question 214

Topic: Surgical Anatomy & Approaches

During the ilioinguinal approach for anterior pelvic ring fixation, significant brisk arterial bleeding is encountered posterior to the superior pubic ramus near the symphysis. This hemorrhage is most likely originating from an anastomosis between which of the following vessels?

. Internal pudendal and superior gluteal arteries
. External iliac and obturator systems
. Internal iliac and inferior epigastric arteries
. Superior and inferior gluteal arteries
. Femoral and circumflex iliac arteries

Correct Answer & Explanation

. External iliac and obturator systems

Explanation

The corona mortis ('crown of death') is a common vascular anastomosis connecting the external iliac system (usually the inferior epigastric artery/vein) with the internal iliac system (obturator artery/vein). It is located on the posterior aspect of the superior pubic ramus and is highly susceptible to iatrogenic injury.

Question 215

Topic: Surgical Anatomy & Approaches

A 24-year-old male is treated with an anterior subcutaneous pelvic internal fixator (INFIX) for an APC-II pelvic injury. Post-operatively, he complains of burning pain and numbness over the anterolateral aspect of his thigh. Injury to which of the following nerves is the most likely cause?

. Femoral nerve
. Obturator nerve
. Lateral femoral cutaneous nerve
. Ilioinguinal nerve
. Genitofemoral nerve

Correct Answer & Explanation

. Lateral femoral cutaneous nerve

Explanation

The most common nerve complication associated with the INFIX procedure is irritation or injury to the lateral femoral cutaneous nerve (LFCN) due to the subcutaneous placement of the connecting rod and supra-acetabular screws.

Question 216

Topic: Surgical Anatomy & Approaches

During the anterior intrapelvic (Stoppa) approach for a pelvic ring injury, massive hemorrhage occurs from a vessel located superior to the superior pubic ramus. This vessel is an anastomosis between which two vascular systems?

. Internal pudendal and external iliac
. Obturator and external iliac
. Obturator and internal iliac
. Inferior epigastric and internal pudendal
. Superior gluteal and internal pudendal

Correct Answer & Explanation

. Obturator and external iliac

Explanation

The corona mortis is a vascular anastomosis between the obturator and external iliac systems (or inferior epigastric vessels) located over the superior pubic ramus. It is at high risk of iatrogenic injury during anterior intrapelvic approaches.

Question 217

Topic: Surgical Anatomy & Approaches

A patient undergoes placement of a subcutaneous anterior pelvic internal fixator (INFIX) for an LC-1 pelvic ring injury. Postoperatively, the patient complains of numbness, tingling, and a burning sensation over the anterolateral aspect of the thigh. Which nerve is most likely affected by the implant?

. Femoral nerve
. Obturator nerve
. Lateral femoral cutaneous nerve
. Genitofemoral nerve
. Ilioinguinal nerve

Correct Answer & Explanation

. Lateral femoral cutaneous nerve

Explanation

The lateral femoral cutaneous nerve (LFCN) is highly susceptible to compression or traction injury from the INFIX bar or pedicle screws, leading to meralgia paresthetica. Proper implant positioning is critical to minimize this risk.

Question 218

Topic: Surgical Anatomy & Approaches

A surgeon uses the standard anterolateral approach to the distal tibia for open reduction and internal fixation of a pilon fracture.

This surgical approach utilizes an internervous plane between which two nerves?

. Tibial nerve and sural nerve
. Superficial peroneal nerve and deep peroneal nerve
. Saphenous nerve and superficial peroneal nerve
. Deep peroneal nerve and tibial nerve
. Sural nerve and saphenous nerve

Correct Answer & Explanation

. Superficial peroneal nerve and deep peroneal nerve

Explanation

The anterolateral approach to the distal tibia and ankle uses the internervous plane between the lateral compartment (innervated by the superficial peroneal nerve) and the anterior compartment (innervated by the deep peroneal nerve).

Question 219

Topic: Surgical Anatomy & Approaches

A 22-year-old gymnast presents with acute elbow pain after a fall. CT imaging reveals a coronal shear fracture of the capitellum extending into the medial trochlea, consistent with a Dubberley Type 3A fracture.

Based on the medial extension, what surgical approach is most appropriate for adequate visualization and fixation?

. Standard medial over-the-top approach
. Limited lateral approach (Kocher interval)
. Extensile lateral approach (Kaplan or extended Kocher)
. Posterior triceps-splitting approach
. Anterior Henry approach

Correct Answer & Explanation

. Extensile lateral approach (Kaplan or extended Kocher)

Explanation

Coronal shear fractures that extend medially into the trochlea (Dubberley Type 3) often require an extensile lateral approach to visualize the medial articular extension. A standard limited Kocher approach fails to provide adequate access to the medial trochlea for anatomic reduction.

Question 220

Topic: Surgical Anatomy & Approaches

During the placement of a percutaneous S1 iliosacral screw for a sacral fracture, the surgeon inadvertently breaches the anterior cortex of the sacral ala. Which anatomic structure is at greatest immediate risk of injury?

. Sciatic nerve
. Pudendal nerve
. L5 nerve root
. S1 nerve root
. Superior gluteal artery

Correct Answer & Explanation

. L5 nerve root

Explanation

The L5 nerve root courses directly over the anterior aspect of the sacral ala. An anterior cortical breach during S1 iliosacral screw placement places the L5 nerve root at significant risk of iatrogenic injury.

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