Distal radius malunion in adults.

Distal radius malunion (DRMU) consists in a non-anatomical consolidation of a distal radius fracture. The resulting alteration of the articular or extra-articular radial anatomy impairs wrist function to a greater or lesser degree: Restricted ranges of motion, loss of strength, pain. There may also be nerve or tendon involvement. Adaptive carpal malalignment and ulnar-carpal impingement are also possible. Imaging assessment should at least include X-ray and CT; CT-arthrography is essential in intra-articular DRMU, which regularly progresses toward radiocarpal osteoarthritis. Surgical indications are guided by clinical assessment. Restoring distal radial anatomy requires osteotomy, according to type of DRMU: anterior or posterior opening or closing wedge. Bone or bone-substitute graft may need to be associated. Computerisation has improved planning and should be implemented, whenever possible. Ulnar osteotomy may be performed, isolated or associated to distal radial osteotomy. Palliative partial fusion or bone resection is possible in case of joint involvement or in patients with low functional demand.

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