1. General Principles & Basic Science MCQs

During surgical approaches to the anterior acetabulum, the "Corona Mortis" is a significant vascular hazard. Which of the following best describes this structure?

During a standard deltopectoral approach to the proximal humerus, meticulous retraction must be used near the coracoid process. Where does the axillary nerve course relative to the conjoint tendon?

The anterior (Smith-Petersen) approach to the hip is a true internervous plane. Which two muscles form the superficial surgical interval for this approach?

A 35-year-old male sustains a posterior hip dislocation in a motor vehicle collision. Which of the following arteries provides the primary blood supply to the adult femoral head and is most at risk in this injury?

During a posterior approach to the humerus for internal fixation of a distal third shaft fracture, the surgeon visualizes the radial nerve. Which vascular structure runs directly with the radial nerve in the spiral groove?

During an anterior intrapelvic (modified Stoppa) approach for an acetabular fracture, significant hemorrhage occurs near the superior pubic ramus. This is most likely due to injury to the "corona mortis", which is an anastomosis between which two vascular systems?

When performing a Smith-Petersen (anterior) approach to the hip, which internervous plane is utilized for the superficial dissection?

Recent quantitative anatomical studies have demonstrated that the predominant blood supply to the humeral head is derived from which of the following vessels?

A 35-year-old sustains a closed, spiral fracture of the distal third of the humeral shaft. Initial exam shows intact radial nerve function. Following closed reduction and splinting, the patient develops a complete wrist drop. What is the most appropriate next step in management?

A 40-year-old male sustains a traumatic posterior hip dislocation. Following closed reduction, he exhibits foot drop and an inability to actively extend his great toe. Which division of the sciatic nerve is most commonly injured in this scenario, and what sensory deficit is expected?

During an anterior intrapelvic (modified Stoppa) approach for an acetabular fracture, significant hemorrhage occurs near the superior pubic ramus. This is most likely due to injury to the 'corona mortis', which is an anastomosis between the:

When performing a lateral approach to the distal humerus, understanding the course of the radial nerve is critical. On average, at what distance proximal to the lateral epicondyle does the radial nerve pierce the lateral intermuscular septum to enter the anterior compartment?

During open reduction and internal fixation of a posterior glenoid rim fracture via a classic posterior approach, the surgeon dissects near the quadrangular space. Which vascular structure passes through this space alongside the axillary nerve?

An orthopedic surgeon is performing an ilioinguinal approach for an anterior column acetabular fracture. Severe hemorrhage occurs over the superior pubic ramus near the symphysis. This bleeding is most likely due to injury of the corona mortis, which represents an anastomosis between which two vascular systems?

When performing a surgical dislocation of the hip via a trochanteric flip osteotomy, the deep branch of the medial femoral circumflex artery (MFCA) must be protected. To preserve this vessel, the osteotomy must exit proximal to which of the following structures?

During an anterolateral approach to the distal humeral shaft, the surgeon longitudinally splits the brachialis muscle. What is the primary anatomic rationale for ensuring the lateral half of the brachialis remains intact against the bone?

A 24-year-old male suffers a posterior hip dislocation. Reduction is performed 8 hours post-injury. Which pathophysiological mechanism most directly contributes to the high risk of femoral head osteonecrosis in this specific clinical scenario?

A 35-year-old male requires open reduction and internal fixation of a Pipkin Type II femoral head fracture. The surgeon elects to use an anterior (Smith-Petersen) approach. Which vascular structure consistently crosses the internervous plane of this approach and typically requires ligation?

A 68-year-old female undergoes open reduction and internal fixation of a 3-part proximal humerus fracture via a deltopectoral approach. To safely mobilize the proximal fragment, the surgeon must be mindful of the axillary nerve. Which vascular structure courses with this nerve through the quadrangular space, and what are the boundaries of this space?

A 12-year-old girl is evaluated for multiple bony protuberances around her knees and ankles, leading to forearm bowing and short stature. The underlying genetic mutation for this condition primarily affects the synthesis of which of the following?