Vet Comp Orthop Traumatol 2007; 20(01): 70-72
DOI: 10.1055/s-0037-1616591
Brief Communication
Schattauer GmbH

Contact mechanics of the ovine stifle during simulated early stance in gait

An in vitro study using robotics
N. K. Lee-Shee
1   Department of Human Health and Nutritional Sciences
,
J. P. Dickey
1   Department of Human Health and Nutritional Sciences
,
M. B. Hurtig
2   Department of Clinical Studies, University of Guelph, Guelph, Canada
› Author Affiliations
Further Information

Publication History

Received 01 December 2005

Accepted 08 May 2006

Publication Date:
21 December 2017 (online)

Summary

Ovine stifle joint contact pressures and contact areas were measured in vitro using a six degree-of-freedom (DOF) robotic system. The robot generated static joint loads of 1.875 times body weight (BW) compression, 0.15 BW medial shear and 0.625 BW cranial shear at 6.5o of flexion for four specimens, simulating the early stance phase of gait (walking). This condition represents a period of intense loading and was implemented as a worst-case loading scenario for the joint at this gait. We determined that the medial and lateral compartments bore 5.5 ± 0.9 MPa and 4.4 ± 1.1 MPa of mean pressure, respectively, on 107.7 ± 28.7 mm2 and 60.8 ± 56.3 mm2 of area, respectively. The unique contribution of this study is that stifle contact pressures and areas were determined during loading which simulated physiological levels (early stance phase of gait). This information is important to our understanding of the stresses that must be borne by repair tissues/constructs that are implanted into human and animal tibio-femoral joints.

 
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