Improved clinical outcomes and a low rate of failure following implantation of a patellofemoral inlay arthroplasty model featuring an enlarged lateral offset – a prospective clinical and radiographic evaluation at short term follow-up

• DOI: 10.1007/s00402-025-05832-w
• Publication Date: 2025-03-23T08:33:57Z
• Authors: Matthias Cotic; Tiago Martinho; Svenja Höger; Marco-Christopher...; Maximilian Hinz; Sebastian Siebenlist; Andreas B. Imhoff; Armin Runer
• Keywords: WOMAC; Inlay; Patellofemoral joint

Abstract Purpose To prospectively evaluate clinical, functional, radiographic, and sports-related short-term outcomes following isolated patellofemoral inlay arthroplasty (PFIA) utilizing an model featuring enlarged lateral offset. Methods Patients who underwent with the Hemi-CAP ® Kahuna Prosthesis (Anika Therapeutics, Franklin, MA, USA) between January 2017 July 2020 were included in study assessed both preoperatively at a minimum follow-up of 24 months postoperatively. Patient-reported measures (PROs) transformed Western Ontario McMaster Universities Arthritis Index (WOMAC), Visual Analogue Scale (VAS) for pain, Tegner Activity Scale. The Kellgren-Lawrence grading scale was used to assess tibiofemoral osteoarthritis (OA) progression. Caton-Deschamps differences pre- postoperative patellar height. Results Eighteen patients (19 knees, 86% follow-up) available 28.2 ± 9.1 (range 24.0–55.0) months. WOMAC score (55.8 16.0 77.2 17.0; p <.001) VAS pain (6.1 2.3 2.7 2.1; improved statistically significantly from whereas mean (2.5 1.3 3.1 1.3; >.05) slightly. No significant progression OA ( or changes height observed. implant-related maltracking instability reported. One patient (5.3%) required revision surgery due aseptic component loosening. Conclusion Isolated implant offset has been shown be effective safe intervention symptomatic osteoarthritis. procedure knee function relief, low failure rates observed follow-up. Level evidence 4, prospective case series.