Surgical Anatomy & Approaches MCQs

During the anterior ilioinguinal approach for an acetabular fracture, severe hemorrhage is suddenly encountered just posterior to the superior pubic ramus. What vascular structure is most likely injured?

A 42-year-old male presents with a completely displaced, highly comminuted midshaft clavicle fracture with 3 cm of shortening. He undergoes open reduction and internal fixation with a superiorly placed anatomic locking plate. Which nerve is most at risk of iatrogenic injury during the surgical approach?

A 25-year-old male sustains a closed spiral fracture of the distal third of the humeral shaft. Initial exam in the ED shows completely intact radial nerve function. Following closed reduction and splint application, the patient immediately develops a new-onset complete radial nerve palsy. What is the most appropriate management?

Following a closed humerus fracture, a patient develops a complete radial nerve palsy. Electromyography (EMG) at 4 weeks shows fibrillations, but no voluntary motor unit action potentials. Pathologically, the injury involves complete disruption of the axon and myelin sheath, but the endoneurium, perineurium, and epineurium remain completely intact. According to the Seddon classification, what is this specific grade of nerve injury?

A surgeon is performing the Smith-Petersen approach to the hip. To safely access the joint, the surgeon must utilize the internervous plane between which two muscles?

Following a mid-shaft humerus fracture, a patient demonstrates a complete radial nerve palsy. Electromyography (EMG) is ordered to evaluate the extent of the injury. How long after the injury should the EMG be performed to reliably detect fibrillation potentials in the denervated muscles?

A 28-year-old female sustains a closed midshaft humerus fracture. Her initial neurovascular examination in the emergency department is entirely intact. Following a closed reduction and application of a coaptation splint, she develops a complete wrist drop and inability to extend her MCP joints. What is the most appropriate next step in management?

A 45-year-old bodybuilder undergoes repair of a retracted distal biceps tendon rupture using a two-incision technique. Postoperatively, the patient reports an inability to extend the fingers and thumb, though wrist extension is preserved with radial deviation. Which nerve was most likely injured, and what is the mechanism in this surgical approach?

A 42-year-old female sustains a complex coronal shear fracture of the capitellum that extends medially into the trochlea (Dubberley Type IV). Which surgical approach provides the most extensile visualization for anatomic reduction of the articular surface?

A 40-year-old water skier falls forward, forcing her hip into hyperflexion while her knee remains fully extended. MRI shows a complete, 3-tendon avulsion of the proximal hamstrings from the ischial tuberosity, retracted 4 cm. Which nerve is at greatest risk of iatrogenic injury during open surgical repair of this lesion?

A posterior approach to the shoulder requires careful identification and protection of the axillary nerve and posterior circumflex humeral artery as they exit the axilla to innervate the deltoid. Through which of the following spaces do these structures pass, and what are its boundaries?

The anterior (Smith-Petersen) approach to the hip is historically lauded for utilizing a true internervous plane. Which two nerves supply the superficial muscles that define this plane?

The anterolateral (Watson-Jones) approach to the hip is frequently used for total hip arthroplasty. The superficial plane is developed between the tensor fasciae latae (TFL) and the gluteus medius. Why is this considered an intermuscular plane rather than a true internervous plane?

In evaluating a patient with refractory posterior hip/buttock pain and sciatica with no identifiable lumbar spine pathology, piriformis syndrome is suspected. In the most common anatomical configuration (over 80% of individuals), how does the sciatic nerve pass in relation to the piriformis muscle?

The suboccipital triangle is a critical anatomical landmark during posterior surgical approaches to the craniovertebral junction, as it contains the V3 segment of the vertebral artery and the suboccipital nerve (C1). Which of the following muscles does NOT form a boundary of the suboccipital triangle?

A surgeon is performing an open reduction and internal fixation (ORIF) of a middle-third humeral shaft fracture via a posterior approach. The radial nerve is identified in the spiral groove. Moving distally, the nerve pierces the lateral intermuscular septum to enter the anterior compartment of the arm. At approximately what distance proximal to the lateral epicondyle does this transition occur?

During an ilioinguinal approach for a displaced acetabular fracture, a significant bleeding source is encountered near the superior pubic ramus. This vessel, known as the 'corona mortis', represents an anatomical anastomosis between which two vascular systems?

In approximately 10% of the population, a variation in the relationship between the sciatic nerve and the piriformis muscle exists (Beaton and Anson classification). Which of the following describes the most common anomalous relationship?

During a Kocher-Langenbeck approach for an acetabular fracture, the surgeon carefully dissects near the inferior border of the piriformis. The intrinsic blood supply to the sciatic nerve in this region (arteria comitans nervi ischiadici) is derived from which of the following vessels?

During the anterior (Henry) approach to the proximal radius, the surgeon develops the internervous plane between the brachioradialis and the pronator teres. To fully mobilize the mobile wad laterally, what vascular structure must be identified and ligated?