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The Journal of Bone and Joint Surgery, Vol 76, Issue 7 1000-1008, Copyright © 1994 by Journal of Bone and Joint Surgery, Inc
Motion and laxity of the capitellocondylar total elbow prosthesis
GJ King, E Itoi, GL Niebur, BF Morrey and KN An
Orthopedic Biomechanics Laboratory, Mayo Clinic, Rochester, Minnesota 55905.
The motion and laxity of the capitellocondylar unconstrained total elbow
prosthesis were assessed, with use of an electromagnetic tracking device
and stimulated muscle-loading, after implantation in seventeen cadaveric
elbows. The axis of motion of the elbows with the capitellocondylar
implants averaged 2.1 +/- 2.3 degrees more varus angulation than that of
the intact elbows. This difference may be attributed to the design of the
implant, as the 5-degree-valgus humeral component used in this study has a
smaller valgus inclination than the articular surface of the distal aspect
of the humerus. Although the maximum valgus-varus laxity of the
capitellocondylar elbow prostheses was, on the average, 4.3 +/- 2.4 degrees
greater than normal (with simulated muscle-loading), the data must be
interpreted in light of the fact that this in vitro study did not allow for
soft-tissue healing. The prosthetic components tracked well, and there were
no dislocations or malarticulations provided that appropriate soft-tissue
tensioning and positioning of the components had been achieved at the time
of implantation. Sectioning of either the medial or the lateral collateral
ligament resulted in gross instability of the joint after capitellocondylar
arthroplasty. The ulnar attachment of the medial collateral ligament was
found to be vulnerable to injury during the positioning of the ulnar
component of this implant.
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