The Knee, ISSN: 1873-5800, Vol: 20, Issue: 6, Page: 422-5

Does mobile-bearing knee arthroplasty motion change with activity?

Mikashima, Yoshinori; Ishii, Yoshinori; Takeda, Mitsuhiro; Noguchi, Hideo; Momohara, Shigeki; Banks, Scott A

Knee

Background

The purpose of this study was to evaluate the effect of mobile-bearing implant design and activity on knee arthroplasty kinematics during three activities of daily living.

Methods

In vivo kinematics were analyzed using 3D model registration from fluoroscopic images of non-weightbearing knee flexion-extension, weight-bearing squatting and stair activities in 20 knees in 10 patients with bilateral total knee arthroplasty. Each patient had one rotating-platform and one meniscal-bearing variant of the same prosthesis design.

Results

Anteroposterior translations in meniscal-bearing knees were larger than those in rotating-platform knees for the different dynamic conditions. Meniscal-bearing knees showed more posterior femoral locations with activities that increased demand on the quadriceps. Condylar translations changed little in rotating-platform knees with different activities.

Conclusions

Activity dynamics can have a significant influence on knee kinematics, and have a greater effect on the kinematics of unconstrained meniscal-bearing prostheses than rotating-platform knee prostheses.

Level of evidence

Level II.

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