The Mechanical Axes of the Wrist Are Oriented Obliquely to the Anatomical Axes by Joseph J. Crisco, Wendell M.R. Heard, Ryan R. Rich, David J. Paller,

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Presentation transcript:

The Mechanical Axes of the Wrist Are Oriented Obliquely to the Anatomical Axes by Joseph J. Crisco, Wendell M.R. Heard, Ryan R. Rich, David J. Paller, and Scott W. Wolfe J Bone Joint Surg Am Volume 93(2): January 19, 2011 ©2011 by The Journal of Bone and Joint Surgery, Inc.

An anteroposterior radiograph of the hand and wrist of a cadaveric specimen during the potting process. Joseph J. Crisco et al. J Bone Joint Surg Am 2011;93: ©2011 by The Journal of Bone and Joint Surgery, Inc.

Moments were applied in twenty-four different directions of wrist motion with use of a specifically designed specimen jig that interfaced to a standard materials testing system. Joseph J. Crisco et al. J Bone Joint Surg Am 2011;93: ©2011 by The Journal of Bone and Joint Surgery, Inc.

Typical moment-rotation curves for three different directions of wrist motion. Joseph J. Crisco et al. J Bone Joint Surg Am 2011;93: ©2011 by The Journal of Bone and Joint Surgery, Inc.

The mean values (±1 standard deviation [SD]) for wrist range of motion (ROM) differed with the direction of wrist motion and were maximal in ulnar flexion, 30° from pure flexion. Joseph J. Crisco et al. J Bone Joint Surg Am 2011;93: ©2011 by The Journal of Bone and Joint Surgery, Inc.

The mean neutral zone (NZ) values had a similar general relation with the direction of wrist as did the mean range-of-motion (ROM) values. Joseph J. Crisco et al. J Bone Joint Surg Am 2011;93: ©2011 by The Journal of Bone and Joint Surgery, Inc.

The mean values (±1 standard deviation [SD]) for wrist stiffness (KROM) ranged from approximately 0.15 to 0.45 Nm, with the smallest stiffness value in the direction of ulnar flexion and the largest stiffness value in the direction of radial flexion. Joseph J. Crisco et al. J Bone Joint Surg Am 2011;93: ©2011 by The Journal of Bone and Joint Surgery, Inc.