Morphometric Tibial Implant Decreases Posterior Overhang Rate and Improves Clinical Outcomes: Results of a Prospective, Matched Controlled Study

The Journal of Arthroplasty
Paul BizzozeroJean-Noël Argenson

Abstract

Tibial implant's positioning in total knee arthroplasty (TKA) requires a compromise between implant's rotation and bone coverage. We hypothesized that morphometric tibial trays (MTTs) would improve implant positioning and clinical outcomes as compared with symmetrical tibial trays. Thirty-three patients were included prospectively according to the following criteria: age from 18 to 85 years, body mass index <35 kg/m2, and posterostabilized cemented TKA performed for primary arthritis. Patients were matched for age, gender, body mass index, and preoperative international knee society (IKS) scoring system and Knee Injury and Osteoarthritis Outcome Score (KOOS) pain score, in a 1:1 fashion with patients from a prospectively collected database receiving a symmetrical tibial tray TKA. Tibial implant's rotation, bone coverage, and the percentage of patients with a posterior overhang (PO) >3 mm were assessed using computerized tomography. The IKS and the KOOS were compared at 3-year follow-up. Bone coverage (90% vs 88%, P = .07) and rotation (mean difference 0.7 ± 3°; P = .69) were not different between the 2 groups. The percentage of patient with a PO was lower in the morphologic group (2/33 vs 14/33, P = .01, odds ratio = 10.3 [2.12...Continue Reading

Citations

Feb 2, 2020·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Yoshiki Okazaki, Nicolas Pujol
Mar 22, 2021·The Journal of Arthroplasty·Florent Bernard de VilleneuveJean-Noel Argenson
Jul 14, 2021·Archives of Orthopaedic and Trauma Surgery·Cécile BataillerSébastien Parratte

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