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Double-Concave Deformity of the Polyethylene Tibial Post in Posterior Stabilized Total Knee Arthroplasty |
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| Authors: | Yasuo Niki Hideo Matsumoto Fumihiro Yoshimine Yoshiaki Toyama Yasunori Suda Scott A. Banks |
| Affiliation: | ? Department of Orthopaedic Surgery, Keio University, Shinjuku-ku, Tokyo, Japan;† Department of Orthopaedic Surgery, Tokyo Metropolitan-Ohkubo Hospital, Tokyo, Japan;‡ Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida |
| Abstract: | This report describes a unique case of bilateral total knee arthroplasty necessitating revision of the polyethylene insert, which showed prominent marks on the tibial post resulting from repeated seiza-style sitting. The patient presented 7 years postoperatively with knee pain and flexion disturbance due to continuous joint effusion persisting for more than 4 months. Proliferating synovia throughout the joint revealed reactive synovitis to polyethylene particles. The retrieved polyethylene inserts displayed double-concave deformity of the tibial post with burnishing and creep in tibiofemoral articulation. The damage pattern of retrieved polyethylene inserts reflected the data from tibiofemoral contact location obtained using a shape-matching technique in the early postoperative phase. This case provides an example of damage to the polyethylene tibial post caused by a floor-sitting lifestyle and the potential clinical sequelae. |
| Keywords: | total knee arthroplasty deep flexion polyethylene insert tibial post floor-sitting lifestyle shape matching |
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