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Approximately 50% of the wrist load is accepted by distal radius and 50% is accepted by the distal ulna
1%
39/3610
Approximately 80% of the wrist load is accepted by the distal radius and 20% is accepted by the distal ulna
28%
1022/3610
Approximately 80% of the wrist load is accepted by the distal ulna and 20% is accepted by the distal radius
3%
103/3610
Approximately 95% of the wrist load is accepted by the distal radius and 5% is accepted by the distal ulna
63%
2264/3610
Approximately 60% of the wrist load is accepted by the distal radius and 40% is accepted by the distal ulna
5%
166/3610
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Ulnar variance describes the cranio-caudal position of the distal ulna in relation to the distal radius at the wrist. In neutral ulnar variance, 80% of the compressive load across the wrist is accepted by the distal radius, and 20% is accepted by the distal ulna. With -2.5mm of ulnar variance (negative ulnar variance), approximately 5% of the wrist load is accepted by the distal ulna. With +2.5mm of ulnar variance (positive ulnar variance), approximately 40% of the wrist load is accepted by the distal ulna. As discussed in the biomechanical study by Palmer and Werner, the loading characteristics of the wrist are dependent on the radio/ulnar variance. Specifically, a 2.5 mm increase in ulnar variance increases load accepted by ulno-carpal joint from 18% to 42%; a 2.5 mm decrease in the ulno-carpal variance will decrease the load accepted by the ulno-carpal joint to 4.3%. Friedman and Palmer review the clinical diagnosis, pathophysiology, and treatment of ulnar impaction syndrome.
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