2025 ISAKOS Congress in Munich, Germany

2025 ISAKOS Biennial Congress Paper


Previous Arthroscopy Does Not Decrease Survivorship or Functional Outcomes for Unicompartmental Knee Arthroplasty Patients

Anneke Prankerd-Gough, MBChB, Auckland NEW ZEALAND
Mei Lin Tay, PhD, Auckland NEW ZEALAND
Scott M Bolam, MBChB, PhD, Auckland NEW ZEALAND
Paul Monk, DPhil (Oxon), FRCS, Auckland, Westmere NEW ZEALAND
Simon W. Young, MD, FRACS, Auckland NEW ZEALAND

North Shore Hospital, Auckland, Auckland, NEW ZEALAND

FDA Status Not Applicable

Summary

In this large patient cohort with comprehensive review of clinical data and outcomes, we found that prior arthroscopy did not affect survivorship or functional outcomes of UKA patients.

Abstract

Introduction

Arthroscopic procedures for osteoarthritis (OA), in particular arthroscopic meniscectomy, have poorer long-term clinical outcomes compared to those managed non-operatively. In addition, previous arthroscopy is associated with worse outcomes following subsequent total knee arthroplasty (TKA), however there is limited data on the impact on subsequent unicompartmental knee arthroplasty (UKA) outcomes. The aim of the study is to investigate whether patients who had arthroscopy prior to UKA have differences in survivorship or functional outcomes compared to those with no prior arthroscopy.

Methods

All patients who received either a primary medial or lateral UKA at four large tertiary hospitals were included (n=2,272). Patient data (age, sex, ethnicity, body mass index (BMI), American Society of Anesthesiologists (ASA) status and surgical data) was recorded following systematic review of all clinical notes and radiographs. Differences between survival curves were analysed using log-rank curves. Differences between categorical data was compared using Fisher’s exact or Chisquared tests, and differences between continuous variables were compared using t-tests.

Results

There was no difference between the survival curves for UKA patients with previous arthroscopy compared to those with no previous arthroscopy (10 years: 91% UKA with previous arthroscopy vs. 92% no previous arthroscopy; 15 years: 78% previous arthroscopy vs. 86% no previous arthroscopy; p = 0.50). OKS was comparable between patients who had previous arthroscopy and those who had no previous arthroscopy at 6 months (38.8 vs. 39.3, p = 0.45), 5 years (42.0 vs. 40.4, p = 0.11) and 10 years (40.8 vs. 40.2, p = 0.71).

Discussion And Conclusion

In this large patient cohort with comprehensive review of clinical data and outcomes, we found that prior arthroscopy did not affect survivorship or functional outcomes of UKA patients.