TY - JOUR
T1 - Rotational stability of the carpus relative to the forearm
AU - Ritt, Marco J.P.F.
AU - Stuart, Paul R.
AU - Berglund, Lawrence J.
AU - Linscheid, Ronald L.
AU - Conney, William P.
AU - An, Kai Nan
N1 - Funding Information:
The wrist is considered the most complex joint in the human body. It has a unique design in order to allow three degrees of freedom; it is a compound joint consisting of the midcarpal, radiocarpal, and distal radioulnarjoints. The radiocarpal and midcarpal joints are primarily responsible for performing the flexion-extension and radio-ulnar movement of the wrist, while the distal radioulnar joint together with the proximal radioulnar joint allows pronation-supination of the forearm. Many daily manual tasks, such as using keys, opening doors, and using tools, are performed by rotation of the forearm. The type of motion involved in accomplishing these tasks oc- From the Biomechanics Laboratory, Department of Orthopedics, Mayo Clinic/Mayo Foundation, Rochester, MN. Supported by National Institutes of Health Grant No. AR40242, the Foundations "De Drie Lichten" and "Anna-fonds," The Netherlands, and the De Puy Fellowship, U.K. Received for publication March 4, 1994; accepted in revised form Sept. 21, 1994. No benefits in any form have been received or will be received from a Commercial party related directly or indirectly to the subject of this article. Reprint requests: Kai-Nan An, PhD, Biomechanics Laboratory, Department of Orthopedics, Mayo Clinic, Rochester, MN 55905.
PY - 1995/3
Y1 - 1995/3
N2 - To perform rotational tasks adequately, the rotational laxity between the radius and the carpus must be constrained within a certain limit. The contribution of nine individual capsuloligamentous structures to the rotational stability of the radiocarpal joint was studied using 14 freshfrozen human cadaveric specimens. Torque-rotation curves, with sequential section of the soft-tissue structures, were used to calculate the percentage contribution of each individual structure. The primary pronation constraint was the palmar radioscaphocapitate ligament. The contributions to supination constraint were more complex; the dorsal radiotriquetral ligament was dominant, assisted by the palmar ulnolunate ligament. Structures originating from the ulna changed their major constraint contribution with forearm orientation, whereas those with a radial origin had a constant contribution independent of forearm rotation. Injury of these structures may lead to rotational instability at the radiocarpal level and should be considered when treating carpal instabilities.
AB - To perform rotational tasks adequately, the rotational laxity between the radius and the carpus must be constrained within a certain limit. The contribution of nine individual capsuloligamentous structures to the rotational stability of the radiocarpal joint was studied using 14 freshfrozen human cadaveric specimens. Torque-rotation curves, with sequential section of the soft-tissue structures, were used to calculate the percentage contribution of each individual structure. The primary pronation constraint was the palmar radioscaphocapitate ligament. The contributions to supination constraint were more complex; the dorsal radiotriquetral ligament was dominant, assisted by the palmar ulnolunate ligament. Structures originating from the ulna changed their major constraint contribution with forearm orientation, whereas those with a radial origin had a constant contribution independent of forearm rotation. Injury of these structures may lead to rotational instability at the radiocarpal level and should be considered when treating carpal instabilities.
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U2 - 10.1016/S0363-5023(05)80031-0
DO - 10.1016/S0363-5023(05)80031-0
M3 - Article
C2 - 7775775
AN - SCOPUS:0028933136
SN - 0363-5023
VL - 20
SP - 305
EP - 311
JO - Journal of Hand Surgery
JF - Journal of Hand Surgery
IS - 2
ER -