Carpal height ratio
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Youm method and Natrass method for carpal height ratio.
Example of diminished carpal height ratio in a case of SLAC.
Carpal height ratio is used in the diagnosis and evaluation of carpal collapse.
Two methods can be used:
Youm method: Dividing carpal height measured in line with by the length of the third metacarpal.
Natrass method: Dividing carpal height measured in line with by the greatest length of the capitate.
- Youm Y, McMurthy RY, Flatt AE, Gillespie TE. Kinematics of the wrist. An experimental study of radial-ulnar deviation and flexion-extension. J Bone Joint Surg Am 1978;60(4):423-431.
- Natrass GR. King Gj, McMurtry RY, Brant RF. An alternative method for determination of the carpal height ratio. J Bone joint Surg Am 1994;76(1 ):88-94.