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Custom-Fit Total Knee Arthroplasty (OtisKnee) Results in Malalignment - The Journal of Arthroplasty

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The Journal of Arthroplasty
Volume 23, Issue 1, Pages 26–29, January 2008

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Custom-Fit Total Knee Arthroplasty (OtisKnee) Results in
Malalignment
Brian A. Klatt, MD, Nitin Goyal, MD, Matthew S. Austin, MD, William J. Hozack, MD
Department of Orthopaedics, Rothman Institute and Thomas Jefferson University, Philadelphia, Pennsylvania

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Received: August 23, 2007; Accepted: October 4, 2007;

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DOI: http://dx.doi.org/10.1016/j.arth.2007.10.001

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We report on 4 patients who underwent total knee arthroplasty with OtisKnee system (OtisMed, Hayward, Calif). An
image-free computer navigation system was used to evaluate the deformities and the recommended cuts. The
recommended custom cuts were as follows: valgus/varus cuts on the femur (5.5° valgus to 0.5° varus) in reference to
the mechanical axis, flexion cuts on the femur (4°-9° of flexion); femoral rotation was within 1° of the epicondylar axis;

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valgus/varus cut on the tibia (3° of valgus to 7.5° of varus); tibial slope (5.5° of anterior slope to 0.5° of posterior slope).
The custom OtisKnee system guides recommended alignment of the components that was more than 3° off of
mechanical axis. The potential for malalignment with this system places implants at high risk of early failure.

Key words:
knee, total knee arthroplasty, custom guides, computer navigation

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No benefits or funds were received in support of the study.

http://www.arthroplastyjournal.org/article/S0883-5403(07)00596-7/abstract

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