The distal interosseous membrane of the forearm is the thinner distal portion of the interosseous membrane connecting the radius and ulna in the distal third of the forearm, separate from the central band and proximal cord.
Transmits longitudinal compressive forces from the radius to the ulna at the distal forearm level, contributes to DRUJ stability by connecting the distal radius and ulna, and is disrupted in Essex-Lopresti injuries.
Essex-Lopresti injury (radial head fracture + interosseous membrane disruption + DRUJ instability) disrupts the distal interosseous membrane, allowing proximal radial migration after radial head excision. The distal membrane is the key structure preventing proximal migration — its disruption mandates radial head reconstruction rather than excision.
Combined radial head fracture and interosseous membrane disruption producing proximal radial migration after radial head excision, requiring radial head arthroplasty and membrane reconstruction.
The distal interosseous membrane integrity is assessed by DRUJ examination in all radial head fractures — DRUJ laxity indicates membrane disruption and Essex-Lopresti pattern.
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