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Surgical Anatomy & Approaches MCQs

Practice Set 89 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 1761

Topic: Surgical Anatomy & Approaches

During the ilioinguinal approach for an anterior column acetabular fracture, significant hemorrhage is encountered just superior to the superior pubic ramus. This bleeding is most likely originating from a vascular anastomosis between which of the following two systems?

. Internal pudendal and obturator
. External iliac and obturator
. Internal iliac and superior gluteal
. Inferior epigastric and internal pudendal
. External iliac and internal pudendal

Correct Answer & Explanation

. Internal pudendal and obturator

Explanation

The 'Corona Mortis' is a critical, potentially life-threatening vascular anastomosis between the obturator vessels (internal iliac system) and the external iliac or inferior epigastric vessels. It is located over the superior pubic ramus and is at high risk of iatrogenic injury during anterior pelvic approaches.

Question 1762

Topic: Surgical Anatomy & Approaches

In a patient with a severely mangled lower extremity following an industrial crush injury, which of the following is considered an absolute indication for primary amputation?

. Anatomically complete transection of the sciatic nerve
. Warm ischemia time greater than 6 hours
. Severe soft tissue loss requiring a free flap
. Segmental tibial bone loss greater than 10 cm
. Transection of the posterior tibial nerve in an adult

Correct Answer & Explanation

. Anatomically complete transection of the sciatic nerve

Explanation

While severe nerve injuries and massive bone loss are relative indications, a warm ischemia time exceeding 6 hours is widely considered an absolute indication for primary amputation. Prolonged warm ischemia leads to irreversible muscle necrosis and severe reperfusion toxicity.

Question 1763

Topic: Surgical Anatomy & Approaches

A 38-year-old male falls from a height and sustains a transverse with posterior wall acetabular fracture. Which surgical approach provides the most direct and appropriate access for anatomic reduction and fixation of this specific fracture pattern?

. Ilioinguinal approach
. Anterior intrapelvic (Stoppa) approach
. Kocher-Langenbeck approach
. Extended iliofemoral approach
. Smith-Petersen approach

Correct Answer & Explanation

. Ilioinguinal approach

Explanation

The Kocher-Langenbeck approach provides excellent direct exposure to the posterior column and posterior wall. It is the preferred and most commonly utilized approach for transverse with posterior wall acetabular fractures.

Question 1764

Topic: Surgical Anatomy & Approaches

A 29-year-old motorcyclist presents after a high-speed crash with severe left shoulder pain, a completely flail upper extremity, and absent radial and ulnar pulses. Radiographs show a laterally displaced scapula and an intact clavicle. Which neurovascular structure is at highest risk of severe avulsion injury?

. Axillary nerve
. Brachial plexus and subclavian artery
. Musculocutaneous nerve
. Thoracodorsal artery
. Suprascapular nerve

Correct Answer & Explanation

. Axillary nerve

Explanation

Scapulothoracic dissociation is characterized by complete disruption of the scapulothoracic articulation. The massive lateral traction force frequently causes severe, often irreversible avulsion injuries to the brachial plexus and the subclavian or axillary vessels.

Question 1765

Topic: Surgical Anatomy & Approaches

A 32-year-old male sustains a closed transverse midshaft humerus fracture and presents with an immediate complete wrist drop. An initial attempt at closed reduction and functional bracing is performed. The radial nerve palsy persists immediately post-reduction. What is the most appropriate next step in the management of the radial nerve palsy?

. Immediate surgical exploration of the radial nerve
. Electromyography (EMG) at 3 weeks
. Immediate tendon transfers
. Clinical observation for spontaneous recovery for 3-4 months
. Ultrasound evaluation of the radial nerve

Correct Answer & Explanation

. Immediate surgical exploration of the radial nerve

Explanation

Radial nerve palsy associated with closed humeral shaft fractures is predominantly a neuropraxia. The standard of care is expectant management (clinical observation) for 3-4 months. Surgical exploration is initially reserved for open fractures, failure of closed reduction, or failure to recover clinically or electromyographically by 4-6 months. Secondary palsies after manipulation are controversial but often observed.

Question 1766

Topic: Surgical Anatomy & Approaches

A 30-year-old male sustains a posterior wall and posterior column acetabular fracture with a native hip dislocation following a dashboard injury. He requires surgical fixation. Which of the following surgical approaches is most appropriate for direct visualization and definitive fixation of these specific fracture components?

. Ilioinguinal approach
. Stoppa approach
. Kocher-Langenbeck approach
. Smith-Petersen approach
. Watson-Jones approach

Correct Answer & Explanation

. Ilioinguinal approach

Explanation

The Kocher-Langenbeck approach provides excellent access to the posterior structures of the acetabulum, specifically the posterior column and posterior wall. It is the gold standard surgical approach for these posterior fracture patterns. Anterior approaches (Ilioinguinal, Stoppa) are utilized for anterior column/wall and quadrilateral plate injuries.

Question 1767

Topic: Surgical Anatomy & Approaches

A patient with a displaced posterior wall acetabular fracture presents with a foot drop preoperatively. Which nerve division is most commonly injured in this scenario?

. Tibial division of the sciatic nerve
. Peroneal division of the sciatic nerve
. Femoral nerve
. Superior gluteal nerve
. Obturator nerve

Correct Answer & Explanation

. Tibial division of the sciatic nerve

Explanation

The peroneal division of the sciatic nerve is most commonly injured in posterior hip dislocations and posterior wall acetabular fractures. This is because it is positioned more laterally, is more tightly tethered, and has less supportive connective tissue.

Question 1768

Topic: Surgical Anatomy & Approaches

A patient sustains a high-energy pelvic ring injury. During surgical exploration via an ilioinguinal approach, massive hemorrhage occurs near the superior pubic ramus. Which vascular structure is most likely injured?

. Superior gluteal artery
. Corona mortis
. Internal pudendal artery
. Obturator artery at the greater sciatic notch
. Inferior gluteal artery

Correct Answer & Explanation

. Superior gluteal artery

Explanation

The corona mortis is a vascular anastomosis between the external iliac/inferior epigastric and the obturator vessels. It lies directly over the superior pubic ramus, making it highly susceptible to injury in pelvic ring trauma and anterior surgical approaches.

Question 1769

Topic: Surgical Anatomy & Approaches

A 6-year-old boy sustains a supracondylar humerus fracture. Radiographs show posterolateral displacement of the distal fragment. Which nerve is at the highest risk of injury in this specific displacement pattern?

. Radial nerve
. Ulnar nerve
. Anterior interosseous nerve (AIN)
. Musculocutaneous nerve
. Axillary nerve

Correct Answer & Explanation

. Radial nerve

Explanation

In a supracondylar fracture with posterolateral displacement of the distal fragment, the proximal fragment is directed anteromedially, placing the median nerve (specifically the AIN) and brachial artery at highest risk. Conversely, posteromedial displacement of the distal fragment directs the proximal fragment anterolaterally, risking the radial nerve.

Question 1770

Topic: Surgical Anatomy & Approaches

A 28-year-old male sustains a diaphyseal fracture of the radius and ulna. He undergoes open reduction and internal fixation. To minimize the risk of radioulnar synostosis, what surgical technique principle should be strictly followed?

. Use of a single extensile incision for both bones
. Subperiosteal dissection using separate surgical approaches for each bone
. Simultaneous bone grafting of both fractures
. Leaving the pronator teres detached to reduce tension
. Using titanium plates instead of stainless steel

Correct Answer & Explanation

. Use of a single extensile incision for both bones

Explanation

Radioulnar synostosis is a severe complication of both-bone forearm fractures. To minimize this risk, surgeons should utilize separate approaches (e.g., volar Henry and dorsal ulnar) and maintain meticulous subperiosteal dissection.

Question 1771

Topic: Surgical Anatomy & Approaches

A 50-year-old male is undergoing open reduction and internal fixation of an anterior column acetabular fracture via the ilioinguinal approach.

During dissection over the superior pubic ramus, the surgeon encounters significant bleeding. Which of the following vascular anastomoses (often termed the 'Corona Mortis') is classically located in this region and at risk of iatrogenic injury?

. Anastomosis between the external iliac and internal iliac vascular systems
. Anastomosis between the femoral and obturator arteries
. Anastomosis between the superior gluteal and inferior gluteal arteries
. Anastomosis between the deep circumflex iliac and inferior epigastric arteries
. Anastomosis between the pudendal and obturator arteries

Correct Answer & Explanation

. Anastomosis between the external iliac and internal iliac vascular systems

Explanation

The Corona Mortis ('crown of death') is a vascular anastomosis between the obturator vessels (which are part of the internal iliac system) and the external iliac or inferior epigastric vessels. It crosses the superior pubic ramus. Iatrogenic injury during the ilioinguinal or Stoppa approach can cause massive, difficult-to-control hemorrhage.

Question 1772

Topic: Surgical Anatomy & Approaches

A 45-year-old female presents with an acetabular fracture after a motor vehicle collision. Computed tomography imaging reveals a fracture extending through the anterior column and the posterior hemitransverse. What is the classic surgical approach for this specific Letournel pattern?

. Kocher-Langenbeck approach
. Ilioinguinal approach
. Extended iliofemoral approach
. Posterior approach alone
. Trans-symphyseal approach

Correct Answer & Explanation

. Kocher-Langenbeck approach

Explanation

Anterior column and posterior hemitransverse fractures are typically addressed via an anterior approach (Ilioinguinal or Stoppa). The primary displacement is anterior, and the posterior component can usually be manipulated indirectly from the anterior window.

Question 1773

Topic: Surgical Anatomy & Approaches

A 7-year-old girl sustains an extension-type supracondylar fracture of the humerus that is posteromedially displaced. Which nerve is at the highest risk of injury in this specific displacement pattern?

. Median nerve
. Ulnar nerve
. Radial nerve
. Musculocutaneous nerve
. Axillary nerve

Correct Answer & Explanation

. Median nerve

Explanation

In extension-type supracondylar fractures with posteromedial displacement, the proximal fragment is driven anterolaterally, putting the radial nerve at the highest risk of injury. Posterolateral displacement endangers the median nerve and brachial artery.

Question 1774

Topic: Surgical Anatomy & Approaches

During an anterior intrapelvic (modified Stoppa) approach for the fixation of an anterior column acetabular fracture, massive hemorrhage occurs while dissecting over the superior pubic ramus. Which anatomical vascular anastomosis has likely been disrupted?

. Anastomosis between the obturator vessels and the external iliac or inferior epigastric vessels
. Anastomosis between the internal pudendal and the inferior gluteal vessels
. Anastomosis between the deep circumflex iliac and the ascending branch of the lateral femoral circumflex artery
. Anastomosis between the internal iliac and the median sacral vessels
. Anastomosis between the superior gluteal artery and the medial femoral circumflex artery

Correct Answer & Explanation

. Anastomosis between the obturator vessels and the external iliac or inferior epigastric vessels

Explanation

The "corona mortis" (crown of death) is a significant vascular anastomosis between the obturator vessels (from the internal iliac system) and the external iliac or inferior epigastric vessels. It crosses the superior pubic ramus at an average distance of 5-6 cm from the symphysis pubis and is at high risk of iatrogenic injury during anterior intrapelvic exposures.

Question 1775

Topic: Surgical Anatomy & Approaches

Following a high-energy dashboard injury, a patient is diagnosed with a posterior wall acetabular fracture and posterior hip dislocation. Post-reduction, the patient exhibits a foot drop and is unable to dorsiflex the toes. Which neural structure is most characteristically injured in this trauma mechanism?

. Tibial division of the sciatic nerve
. Peroneal (fibular) division of the sciatic nerve
. Femoral nerve
. Sural nerve
. Superior gluteal nerve

Correct Answer & Explanation

. Tibial division of the sciatic nerve

Explanation

The sciatic nerve is at high risk during posterior hip dislocations and posterior wall acetabular fractures. The peroneal (fibular) division is disproportionately affected compared to the tibial division due to its lateral and more fixed anatomical position, tethering it as the femoral head displaces posteriorly.

Question 1776

Topic: Surgical Anatomy & Approaches

A surgeon utilizes the direct anterior approach for a total hip arthroplasty, exploiting the interval between the tensor fasciae latae and the sartorius. Which of the following nerves is at greatest risk of iatrogenic injury during the superficial dissection of this approach?

. Superior gluteal nerve
. Inferior gluteal nerve
. Lateral femoral cutaneous nerve
. Femoral nerve
. Sciatic nerve

Correct Answer & Explanation

. Superior gluteal nerve

Explanation

The direct anterior approach utilizes the Hueter interval, an internervous plane between the tensor fasciae latae (superior gluteal nerve) and the sartorius (femoral nerve). The lateral femoral cutaneous nerve crosses the superficial aspect of this operative field and is at highest risk of neuropraxia or transection, which results in lateral thigh numbness (meralgia paresthetica).

Question 1777

Topic: Surgical Anatomy & Approaches

A surgeon is performing a primary THA using a direct anterior (Smith-Petersen) approach. Which of the following neurologic structures is at highest risk during the superficial dissection, and what is its expected sensory distribution if injured?

. Femoral nerve; Anterior thigh sensation
. Lateral femoral cutaneous nerve; Lateral thigh sensation
. Superior gluteal nerve; Gluteal region sensation
. Sciatic nerve; Posterior thigh sensation
. Obturator nerve; Medial thigh sensation

Correct Answer & Explanation

. Femoral nerve; Anterior thigh sensation

Explanation

The direct anterior approach utilizes the internervous plane between the sartorius (femoral n.) and tensor fasciae latae (superior gluteal n.). The lateral femoral cutaneous nerve (LFCN) is highly vulnerable during the superficial dissection as it courses over or near the sartorius muscle just distal to the ASIS. Injury results in lateral/anterolateral thigh numbness (meralgia paresthetica).

Question 1778

Topic: Surgical Anatomy & Approaches

A direct anterior approach to the hip is chosen for a primary total hip arthroplasty. The superficial surgical dissection utilizes an internervous plane between muscles supplied by which two nerves?

. Superior gluteal nerve and inferior gluteal nerve
. Femoral nerve and superior gluteal nerve
. Femoral nerve and obturator nerve
. Sciatic nerve and superior gluteal nerve
. Femoral nerve and sciatic nerve

Correct Answer & Explanation

. Superior gluteal nerve and inferior gluteal nerve

Explanation

The direct anterior approach (Smith-Petersen) utilizes the internervous plane between the sartorius (innervated by the femoral nerve) and the tensor fasciae latae (innervated by the superior gluteal nerve) during the superficial dissection.

Question 1779

Topic: Surgical Anatomy & Approaches

During a direct anterior approach for a total hip arthroplasty, the surgeon develops the internervous plane superficially between the tensor fasciae latae and the sartorius. Which nerve is anatomically at greatest risk of iatrogenic injury during this superficial dissection?

. Superior gluteal nerve
. Femoral nerve
. Lateral femoral cutaneous nerve
. Sciatic nerve
. Obturator nerve

Correct Answer & Explanation

. Superior gluteal nerve

Explanation

The direct anterior (Smith-Petersen) approach uses the superficial interval between the tensor fasciae latae (superior gluteal n.) and sartorius (femoral n.). The lateral femoral cutaneous nerve (LFCN) courses over the sartorius and can cross the surgical interval, putting it at high risk for stretch or transection during the superficial approach.

Question 1780

Topic: Surgical Anatomy & Approaches

The direct anterior (Smith-Petersen) approach to the hip has gained popularity for total hip arthroplasty. During the superficial dissection, the internervous plane is developed between muscles innervated by which of the following pairs of nerves?

. Superior gluteal nerve and inferior gluteal nerve
. Superior gluteal nerve and femoral nerve
. Femoral nerve and obturator nerve
. Inferior gluteal nerve and femoral nerve
. Sciatic nerve and obturator nerve

Correct Answer & Explanation

. Superior gluteal nerve and inferior gluteal nerve

Explanation

The superficial internervous plane in the direct anterior approach to the hip is between the tensor fasciae latae (innervated by the superior gluteal nerve) laterally and the sartorius (innervated by the femoral nerve) medially.

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