1. General Principles & Basic Science MCQs

During an anterior intrapelvic (modified Stoppa) approach for an acetabular fracture, massive hemorrhage can occur if a vascular anastomosis crossing over the superior pubic ramus is injured. This structure, known as the corona mortis, connects which two vascular systems?

During a posterior approach to the shoulder, the surgeon must avoid injury to the axillary nerve as it passes through the quadrangular space. Which of the following accurately describes the boundaries of the quadrangular space?

The direct anterior (Smith-Petersen) approach to the hip utilizes both superficial and deep internervous planes. The deep internervous plane lies between which two muscles?

During a posterior approach to the shoulder, the axillary nerve is at risk when dissecting inferior to the teres minor. Which of the following structures forms the medial boundary of the quadrangular space through which the axillary nerve passes?

A 35-year-old patient with a pelvic ring injury requires open reduction and internal fixation via an ilioinguinal approach. The corona mortis, an important vascular anastomosis, is located on the posterior aspect of the superior pubic ramus. It connects which two vascular systems?

A surgeon is performing a volar approach (Henry) to the radius. In the proximal forearm, the radial artery must be protected. Which muscle serves as the primary anatomic landmark covering the radial artery and superficial radial nerve in this region?

During a posterior approach to the shoulder, the axillary nerve is at risk in the quadrangular space. Which of the following vessels directly accompanies the axillary nerve in this space?

In the most common anatomical variant, the sciatic nerve exits the pelvis in what relation to the piriformis muscle?

A patient presents with a distal third humeral shaft fracture (Holstein-Lewis). Which nerve is most at risk as it passes through the lateral intermuscular septum?

The brachialis muscle is the primary flexor of the elbow. It receives dual innervation from the musculocutaneous nerve and which other nerve?

The pectineus muscle aids in hip flexion and adduction. It typically receives dual innervation from which of the following nerves?

The common peroneal nerve is susceptible to compression at the fibular neck. Which of the following muscles is innervated by the superficial peroneal nerve?

The posterior interosseous nerve (PIN) passes between the two heads of the supinator muscle. Which of the following muscles is innervated by the radial nerve proximal to its division into the PIN and superficial sensory branch?

The adductor canal (Hunter's canal) transmits the superficial femoral artery and vein. Which nerve exits the adductor canal by piercing the vastoadductor fascia?

An orthopedic surgeon is utilizing the ilioinguinal approach to fix a transverse acetabular fracture. During the dissection, a significant vascular anastomosis, the corona mortis, is encountered and must be ligated. This structure connects the external iliac system to the internal iliac system via which vessels?

A 28-year-old athlete presents with deltoid weakness and an area of numbness over the lateral shoulder following an anterior glenohumeral dislocation. The affected nerve normally passes through a quadrilateral space. Which of the following structures forms the superior boundary of this space?

An orthopedic trauma surgeon is using the modified Stoppa approach for anterior ring fixation of an acetabular fracture. Life-threatening hemorrhage can occur if the corona mortis is inadvertently injured. This vascular structure is typically an anastomosis between the external iliac or inferior epigastric vessels and which other system?

A patient with persistent buttock and posterior thigh pain is diagnosed with piriformis syndrome due to an anomalous relationship between the sciatic nerve and the piriformis muscle. What is the most common anatomical variant responsible for this condition?

During the anterior (volar) approach to the forearm for fixation of a midshaft radius fracture, the surgeon develops the proximal internervous plane. This plane is located between two muscles that are supplied by which respective nerves?

During an anterior intrapelvic approach (modified Stoppa) for an acetabular fracture, life-threatening hemorrhage occurs near the posterior aspect of the superior pubic ramus. This is most likely due to injury of the corona mortis, which is an anastomotic vessel connecting which two vascular systems?