Four-corner arthrodesis: influence of the position of the lunate on postoperative wrist motion: a cadaveric study.

Purpose: Evaluate the influence of the position of the lunate on postoperative wrist motion in four-corner arthrodesis.

Methods: Six upper cadaveric limbs were evaluated, comparing the total arc of motion in each wrist after simulating four-corner arthrodesis. The lunate was fixed in 3 different positions: neutral (0 degrees ), extended (30 degrees ), and flexed (20 degrees ).