Advanced Interosseous Membrane Quiz

Q1. Which portion of the interosseous membrane is particularly important for longitudinal stability of the forearm?

• Annular ligament alone
• Palmar aponeurosis
• Central band
• Flexor retinaculum

Q2. A radial head fracture combined with disruption of the interosseous membrane and distal radioulnar joint is classically associated with which injury pattern?

• Essex-Lopresti injury
• Monteggia fracture-dislocation
• Colles fracture
• Galeazzi fracture-dislocation

Q3. What major mechanical problem can result from severe disruption of the interosseous membrane after a radial head injury?

• Proximal migration of the radius
• Anterior dislocation of the scapula
• Fusion of the proximal radioulnar joint
• Permanent distal migration of the humerus

Q4. Why is the radial head functionally important when considering interosseous membrane injury?

• It prevents all forearm pronation
• It forms the distal radioulnar joint
• It anchors the flexor retinaculum
• It helps resist proximal migration of the radius

Q5. Why can disruption of the interosseous membrane affect load distribution through the forearm?

• It normally transfers load from the ulna to the metacarpals only
• It prevents forces from reaching the elbow
• It normally transfers all load directly to the clavicle
• It normally transfers part of the axial load from the radius to the ulna

Q6. Which mechanism can produce an Essex-Lopresti type injury?

• Finger extension against minimal resistance
• Strong axial loading through the forearm
• Isolated contraction of the biceps without external force
• Shoulder abduction without forearm loading

Q7. Why can an interosseous membrane injury produce symptoms at both the elbow and wrist?

• It forms both the elbow and wrist articular surfaces
• It is a tendon extending from the elbow directly into the fingers
• It participates in longitudinal stability linking the proximal and distal forearm
• It contains the median nerve throughout its entire thickness

Q8. Which vessel uses an opening in the distal interosseous membrane to reach the posterior aspect of the forearm?

• Anterior interosseous artery
• Posterior circumflex humeral artery
• Brachial artery
• Superior ulnar collateral artery

Q9. Why is the interosseous membrane more than a passive partition between forearm compartments?

• It functions solely as a pathway for the median nerve
• Its only function is to separate the skin from the muscles
• Its only function is to produce pronation
• It provides muscle attachment, transmits load, and contributes to forearm stability

Q10. Which description best summarizes the anatomy of the forearm interosseous membrane?

• It is a synovial joint between the humerus and radius that produces elbow flexion
• It is a superficial tendon connecting the medial epicondyle to the wrist
• It is an articular disc located entirely within the distal radioulnar joint
• It is a fibrous connection between the radius and ulna that transmits forces, provides muscle attachment, and contributes to forearm stability