Technique and timing of two-stage exchange for infection in TKA.

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Abstract

[Indexed for MEDLINE] 9. BMC Musculoskelet Disord. 2021 Mar 23;22(1):298. doi: 10.1186/s12891-021-04175-y. Influence of Patella thickness on Patellofemoral pressure in total knee Arthroplasty. Tanikawa H(1), Tada M(2), Ogawa R(3), Harato K(3), Niki Y(3), Kobayashi S(3), Nagura T(4). Author information: (1)Department of Orthopedic Surgery, Shiroi Seijinkai Hospital, 3-25-2 Sasazuka, Shiroi-shi, Chiba, 270-1426, Japan. adriatic123sea@gmail.com. (2)Digital Human Research Team, Artificial Intelligence Research Center, National Institute of Advanced Industrial Science and Technology, Tokyo, Japan. (3)Department of Orthopedic Surgery, Keio University School of Medicine, Tokyo, Japan. (4)Department of Clinical Biomechanics, Keio University, Tokyo, Japan. BACKGROUND: Patellofemoral complications are one of the major issues after total knee arthroplasty (TKA). Excessive patellofemoral joint pressure is associated with complications after TKA surgery, and the amount of patellar osteotomy has a direct effect on patellofemoral joint pressure. The purpose of this study was to evaluate the influence of patella thickness on patellofemoral pressure in TKA. METHODS: Five freshly frozen cadavers were operated with a custom-made Stryker posterior stabilizing type knee joint prosthesis. Patellofemoral joint pressure was measured using a pressure sensor, with the knee joint flexed from 90 to 110 degrees, and with patellar thickness of - 2 mm to + 4 mm. RESULTS: Increasing or decreasing patellar thickness significantly increased or decreased patellofemoral pressure. Regarding knee flexion angle, patellofemoral pressure increased with increasing patellar thickness at all flexion angles, but the pressure increase was greatest at 90 degrees of knee flexion and smallest at 110 degrees. CONCLUSIONS: The amount of patellar osteotomy influences the patellofemoral pressure. Surgeons should avoid increasing patella thickness, since the resulting increased patellofemoral pressure may reduce knee joint function. DOI: 10.1186/s12891-021-04175-y PMCID: PMC7986032