1. General Principles & Basic Science MCQs

A patient develops weakness in thumb and finger extension following open reduction and internal fixation of a proximal third radius fracture utilizing an anterior (Henry) approach. Sensation on the dorsum of the hand remains fully intact. The injured nerve typically enters the forearm and passes between the two heads of which muscle?

A patient with neglected suppurative tenosynovitis of the small finger presents with a 'horseshoe abscess' spreading into the thumb. The purulence has tracked proximally into the deep fascial space of the distal volar forearm. This space is known as:

During a dorsal surgical approach to the wrist for scaphoid fixation, Lister's tubercle is identified as a critical bony landmark. The tendon that uses Lister's tubercle as a mechanical pulley is found in which extensor compartment of the wrist?

During an anterior (deltopectoral) approach to the shoulder, the cephalic vein is identified as a landmark. What is the internervous plane utilized in this surgical approach?

A 25-year-old bodybuilder presents with posterior shoulder pain and deltoid weakness. MRI reveals a paralabral cyst compressing a structure within the quadrangular space. Which of the following defines the inferior border of this space?

An orthopedic trauma surgeon is performing an anterior intrapelvic (Stoppa) approach. To avoid life-threatening hemorrhage, caution is taken around the corona mortis. This structure represents an anastomosis between which two vascular systems?

During open reduction and internal fixation of a middle-third humeral shaft fracture via a posterior approach, the radial nerve is identified. At what approximate distance proximal to the lateral epicondyle does the radial nerve pierce the lateral intermuscular septum?

A patient undergoes surgical fixation of an anterior column acetabular fracture via the ilioinguinal approach. Significant hemorrhage is encountered when dissecting over the superior pubic ramus. Which anatomical variant is most likely injured?

During a surgical approach to the greater sciatic notch, the surgeon notes an anatomical variation where a portion of the sciatic nerve pierces the piriformis muscle. Which specific nerve division is most commonly involved in this variant?

During an anterior intrapelvic (modified Stoppa) approach to fix an acetabular fracture, brisk arterial bleeding is encountered just posterior to the superior pubic ramus. This vessel, known as the corona mortis, typically represents an anastomosis between the obturator vessels and which of the following?

A 45-year-old mechanic complains of lateral forearm pain and weakness in extending the fingers at the metacarpophalangeal joints, but examination reveals normal wrist extension with radial deviation. Which of the following anatomic structures is the most common site of compression for the affected nerve?

A 24-year-old baseball pitcher presents with vague posterior shoulder pain and fatigue. MRI reveals isolated atrophy of the teres minor muscle. Compression of a nerve within which of the following anatomic spaces is the most likely cause?

In a surgical approach to the hip, protecting the medial femoral circumflex artery (MFCA) is critical to prevent iatrogenic avascular necrosis of the femoral head. The deep branch of the MFCA passes between which two muscles?

A postmenopausal woman is prescribed a bisphosphonate for osteoporosis. This medication primarily targets osteoclasts. Which of the following describes the microscopic feature by which actively resorbing osteoclasts attach to the bone surface?

A patient demonstrates a positive Trendelenburg sign on the right side during the stance phase of gait. This indicates weakness of the right gluteus medius and minimus muscles. Which nerve innervates these muscles?

The anterior (Smith-Petersen) surgical approach to the hip utilizes a superficial internervous plane. Which two muscles define this plane?

The axillary nerve and posterior circumflex humeral artery exit the axilla through the quadrangular space. Which of the following accurately describes the borders of this space?

During an ilioinguinal or modified Stoppa approach for a pelvic ring injury, the surgeon encounters significant bleeding from the "corona mortis". This structure is an anastomosis between which two vascular systems?

Within the deep posterior compartment of the lower leg, the structures pass behind the medial malleolus. Which structure is located most anteriorly and medially in this space?

The arcade of Frohse is the most common site for entrapment of the posterior interosseous nerve (PIN). Which anatomical structure forms the proximal border of this arcade?