J Bone Joint Surg Br. 1992 Mar;74(2):297-9.

Kinematics of semi-constrained total elbow arthroplasty.

O'Driscoll SW, An KN, Korinek S, Morrey BF.

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Department of Orthopaedic Surgery, Mayo Clinic, Rochester, Minnesota 55905.

Abstract

We used 11 cadaver elbows and a three-dimensional electromagnetic tracking device to record elbow movements before and after implantation of a 'loose-hinged' elbow prosthesis (modified Coonrad). During simulated active motion there was a maximum of 2.7 degrees (+/- 1.5 degrees) varus/valgus laxity in the cadaver joints. This increased slightly after total elbow arthroplasty to 3.8 degrees (+/- 1.4 degrees). These values are lower than those recorded for the cadaver joints and for the prostheses at the limits of their varus/valgus displacements, indicating that both behave as 'semi-constrained' joints under physiological conditions. They suggest that the muscles absorb some of the forces and moments that in a constrained prosthesis would be transferred to the prosthesis-bone interface.

PMID:: 1544973; [PubMed - indexed for MEDLINE]

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