Carpal Instability
A 28-year-old man presents to the emergency department after falling from a motorcycle onto an outstretched hand. He has significant wrist swelling, limited range of motion, and numbness in the median nerve distribution. Lateral radiograph shows the lunate tilted volarly with loss of normal carpal alignment. The capitate is dorsal to the radius. Regarding perilunate and lunate dislocations:
Mark each as TRUE or FALSE
This presentation is consistent with a lunate dislocation (Mayfield Stage IV); the lunate is displac...
In perilunate dislocation (Mayfield Stage III), the lunate maintains its relationship with the radiu...
Perilunate dislocations are more severe than lunate dislocations as they represent a later stage of ...
The Mayfield classification describes progressive perilunate instability: Stage I (scapholunate disr...
Approximately 25% of perilunate dislocations are missed on initial presentation; PA radiograph findi...
Answer the questions to see explanations
Click T (True) or F (False) for each option