Introduction

Knee Osteotomy (KO) is a currently relatively neglected area of joint preserving research. The indications, frequency, complications, and outcomes of KO remain relatively ill-defined. The Australian Orthopaedic Assocation National Joint Replacement Registry commenced collecting knee osteotomy data in 2017.

Materials And Methods

KO data from the AOANJRR was obtained for patient demographics, hospital, diagnosis, technique, reoperation risk, osteoarthritis severity, cumulative percent revision to Total Knee Replacement (TKR).

Results

As of 6 October 2023, 1876 KO performed by 171 surgeons at 83 hospitals were reported to the AOANJRR. The mean age of patients for tibial KO was 46.5 ± 9.9 and femoral KO was 38.3 ± 12.4. 76.4% of the KO were male, pre-obese (BMI 25-30) and ASA 1 & 2. The primary diagnosis was osteoarthritis in 86.8%. 76.5% of patients underwent opening wedge KO and 80.3% were valgus producing. 61 (3.2%) of patients underwent a re-operation with inadequate correction (1.4%) and delayed healing/ non-union (0.09%) being the two commonest reasons. At 6 years the CPR of tibial valgus producing KO to TKR was 1.9% (0.9,3.9).

Discussion

These 6-year results of KO data from the AOANJRR provide valuable clinical insights into the intermediate outcomes of KO. The planned addition of Patient Recorded Outcome Measures will further aid clinical decision-making.