Essex Lopresti lesion in upper limb
**Core Concept**
Essex-Lopresti lesion is a rare but serious injury in the upper limb, resulting from a combination of radial head fracture, disruption of the interosseous membrane, and dislocation of the distal radioulnar joint. This complex injury can lead to instability and dysfunction of the forearm and wrist.
**Why the Correct Answer is Right**
The Essex-Lopresti lesion involves a radial head fracture, which disrupts the radial head and neck, leading to instability in the proximal radioulnar joint. The interosseous membrane, a fibrous band connecting the radius and ulna, is also torn, causing a diastasis between the two bones. This, in turn, leads to a dislocation of the distal radioulnar joint, resulting in radial head subluxation, ulnar styloid process fracture, and disruption of the DRUJ (distal radioulnar joint). The disruption of the interosseous membrane and the radial head fracture are critical components of the Essex-Lopresti lesion.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specifically mention the disruption of the interosseous membrane, which is a key component of the Essex-Lopresti lesion.
**Option B:** This option is incorrect because it does not include the radial head fracture, which is a critical component of the Essex-Lopresti lesion.
**Option C:** This option is incorrect because it does not mention the dislocation of the distal radioulnar joint, which is a characteristic feature of the Essex-Lopresti lesion.
**Clinical Pearl / High-Yield Fact**
The Essex-Lopresti lesion is often associated with a characteristic clinical presentation, including radial head subluxation, ulnar styloid process fracture, and disruption of the DRUJ. A high index of suspicion is required to diagnose this complex injury, and prompt treatment is essential to prevent long-term complications.
**Correct Answer: C. Dislocation of the distal radioulnar joint, radial head fracture, and disruption of the interosseous membrane.**