Surgical Anatomy & Approaches MCQs

The posterior interosseous nerve (PIN) is most vulnerable to iatrogenic injury during a Henry approach to the proximal radius at which of the following anatomic structures?

The axillary nerve passes through the quadrangular space. What muscle forms the inferior border of this space?

In approximately 10-15% of the population, a variation in the relationship between the sciatic nerve and the piriformis muscle exists. What is the most common anatomical variant?

A patient develops a severe horseshoe abscess of the hand extending from the thumb to the small finger. The infection spreads proximally into the distal forearm. In which anatomical space does this proximal extension reside?

When performing an open reduction and internal fixation of a proximal humerus fracture via a deltopectoral approach, the surgeon must be aware of the axillary nerve. How far distal to the lateral edge of the acromion does the axillary nerve typically cross the humerus?

During an anterolateral (Watson-Jones) approach to the hip for a total hip arthroplasty, the surgical interval lies between the tensor fasciae latae and the gluteus medius. What is the innervation of the muscles defining this interval?

During a modified Stoppa approach for an anterior column acetabular fracture, significant bleeding is encountered from the "corona mortis". This vascular structure represents an anastomosis between which two vascular systems?

During a posterior triceps-splitting approach to the humerus for fracture fixation, the radial nerve is identified. At what approximate distance proximal to the lateral epicondyle does the radial nerve typically pierce the lateral intermuscular septum?

In the anterior approach to the hip (Smith-Petersen), the superficial surgical interval relies on an internervous plane. Which of the following describes the innervation of the muscles defining this plane?

During the ilioinguinal approach to the acetabulum, severe bleeding occurs over the superior pubic ramus near the symphysis. This is most likely due to an injury to the "corona mortis," which is an anastomosis between which of the following vessel systems?

A patient complains of deep gluteal pain radiating down the posterior thigh. MRI shows no lumbar disc herniation. The patient has a known anatomic variation where a portion of the sciatic nerve pierces the piriformis muscle. Which component of the nerve typically pierces the muscle in this variant?

During an ilioinguinal approach for an anterior column acetabular fracture, vigorous arterial bleeding is encountered when dissecting over the superior pubic ramus. This bleeding most likely originates from an anastomosis between which two vascular systems?

A 35-year-old male is undergoing open reduction and internal fixation of a capitellum fracture using the Kocher approach. To safely access the joint and protect the posterior interosseous nerve (PIN), the dissection must utilize which of the following internervous planes?

A 28-year-old overhead athlete presents with vague posterior shoulder pain and numbness over the lateral deltoid. MRI reveals severe isolated atrophy of the teres minor. Which of the following neurovascular bundles is most likely compressed in the quadrilateral space?

During a primary total hip arthroplasty using the direct anterior (Smith-Petersen) approach, the surgeon exploits an internervous plane between two muscles. Which of the following accurately describes this plane?

A trauma surgeon is performing an anterolateral approach to the distal humerus for a complex fracture. Knowledge of the radial nerve's course is crucial. At approximately what distance proximal to the lateral epicondyle does the radial nerve pierce the lateral intermuscular septum to enter the anterior compartment?

During an anterior (Henry) approach to the radius, the surgeon enters the internervous plane in the proximal forearm. Which two nerves innervate the muscles that define this superficial proximal interval?

A primary total hip arthroplasty is performed using the direct anterior approach (Smith-Petersen). Which internervous plane is utilized during the superficial dissection of this surgical approach?

When performing an arthroscopic capsular release for adhesive capsulitis, the axillary nerve is most vulnerable at the 6 o'clock position. Approximately how far is the axillary nerve from the inferior glenoid rim in a standard adult shoulder?

A patient presents with an inability to actively extend the fingers at the metacarpophalangeal joints but maintains normal wrist extension with radial deviation. Entrapment of the affected nerve is most likely to occur at the proximal edge of which muscle?