Surgical Anatomy & Approaches MCQs

A surgeon is planning a posterior approach to the humerus for internal fixation of a distal third shaft fracture. To safely identify and protect the radial nerve, the surgeon must understand its anatomical course. At what distance proximal to the radiocapitellar joint does the radial nerve typically pass from the posterior to the anterior compartment through the lateral intermuscular septum?

During the posterior operative approach to the humerus for internal fixation of a midshaft fracture, the radial nerve is identified to protect it from iatrogenic injury. At what approximate location does the radial nerve pierce the lateral intermuscular septum to transition from the posterior to the anterior compartment of the arm?

A 30-year-old man sustains a closed midshaft humeral fracture with an associated primary radial nerve palsy on the day of injury. He is treated non-operatively with a functional brace. At 3.5 months post-injury, he shows absolutely no signs of clinical or electromyographic (EMG) recovery of the radial nerve. What is the most appropriate next step in management?

During an ilioinguinal approach for an anterior column acetabular fracture, excessive bleeding is encountered while dissecting over the superior pubic ramus. The bleeding is most likely originating from an anastomosis between which of the following vessels?

A 45-year-old male undergoes open reduction and internal fixation of a transverse acetabular fracture via a Kocher-Langenbeck approach. Intraoperatively, what is the optimal positioning of the ipsilateral lower extremity to minimize iatrogenic tension on the sciatic nerve?

During an ilioinguinal approach for an anterior column acetabular fracture, surgical dissection proceeds through the middle window. Which of the following structures defines the lateral border of this middle window?

During the ilioinguinal approach for an anterior column acetabular fracture, significant hemorrhage occurs while dissecting over the superior pubic ramus. This bleeding is most likely originating from an anastomosis between the external iliac (or deep inferior epigastric) vessels and which of the following vessels?

A 32-year-old male presents to the emergency department after a high-speed motor vehicle collision. He sustained a dashboard injury, resulting in a posterior hip dislocation. On examination, his hip is flexed, adducted, and internally rotated. Distal pulses are intact, and he has a partial foot drop. The most critical factor influencing the long-term outcome, specifically regarding avascular necrosis (AVN) of the femoral head, is:

A 55-year-old male requires open reduction for an irreducible posterior hip dislocation with a large posterior acetabular wall fracture. The surgeon opts for the Kocher-Langenbeck approach. During the deep dissection, as depicted in the illustration below, which critical neurovascular structure must be carefully identified and protected, typically by retracting it medially?

A 38-year-old male sustains a posterior hip dislocation. After successful closed reduction, he is noted to have a new-onset foot drop and weakness in ankle dorsiflexion and eversion. Sensation is diminished over the dorsum of the foot. This neurological deficit most likely involves which division of the sciatic nerve, and what is its typical prognosis?

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

An orthopedic surgeon is performing an ilioinguinal approach for an anterior column acetabular fracture. During dissection over the superior pubic ramus, brisk arterial bleeding is encountered. This is most likely due to an anastomosis between which two vascular systems?

When utilizing an anterolateral deltoid-splitting approach for locked plating of a proximal humerus fracture, which anatomic structure dictates the absolute safe distal extent of the deltoid split?

A 42-year-old male undergoes open reduction and internal fixation of a transverse posterior wall acetabular fracture via a Kocher-Langenbeck approach. Postoperatively, he exhibits a foot drop and inability to extend his great toe. Which specific nerve division is most susceptible to this iatrogenic injury?

A 55-year-old male sustains an anterior shoulder dislocation combined with a displaced greater tuberosity fracture. Prior to reduction, he has a loss of sensation over the lateral aspect of his shoulder. Injury to which of the following nerve roots primarily contributes to this specific sensory deficit?

During the ilioinguinal approach for an anterior column acetabular fracture, the surgeon operates through three distinct anatomical windows. Which structures define the lateral and medial borders of the middle window?