A Perspective of Growth of Unicompartmental Knee Replacement in India - Registry Data and Global Trends.

ABSTRACT

Introduction: The purpose of this study is to analyze the trend of unicompartmental knee replacement (UKR) in India, based on the data obtained from the Indian joint registry, in comparison with the global trends. Materials and Methods: This study is a retrospective analysis of data from an Indian joint registry for cases performed between 2016 and 2021. A total of 1086 UKRs were identified and the following information was analyzed demographic data, diagnosis leading to primary UKR, yearwise surgeon inclination toward UKR, implant preference, regions where UKR was preferred, and the effect of robotics in UKR. UKR registry data were compared with the registry data from the UK (NJR), Sweden (SKAR), Australia (AOJR), and the USA (AJRR). Results: One thousand eighty-six UKRs were included in the study The vast majority of them (97%) were implanted due to primary osteoarthritis followed by deformity (2%), as in accordance with other registries. Since 2016, though very minimal, there has been a gradual increase in the numbers and the percentage of cases contributed by UKR, of all knee replacements with the maximum of 2.85% reported in 2019. The same has been observed in the global trends as well. Oxford knees (60%) are the most preferred implants followed by journey uni knee (20%) in India. The cities where more unicompartmental knee are performed are in the order of Mumbai (32.78%), Faridabad (9.39%), Pune (7.92%), and Hyderabad (6.35%). Surgeon preference for robotic assisted UKR is increasing, accounting for 34% of UKR in 2020, which is in coherence with AOJR. Conclusion: The percentage of knee replacements contributed by UKR is increasing globally and the same trend can be observed in India. Oxford phase III prosthesis are the most preferred UKR prosthesis. UKRs are mostly performed in selected pockets of India, with Mumbai almost contributing to one-third of all the cases. The use of robotics in UKR is increasing and is expected to give better results in the future.