Patient reported outcome measures and early revision of medial unicompartmental knee arthroplasty (UKA) vs total knee arthroplasty (TKA) in patients with medial osteoarthritis – A Dutch Arthroplasty Register study
Approval date: December 5th 2025
Starting date: December 16th 2025
R van Geenen, C Dijkman, I Koenraadt-van Oost, A de Nijs
Research proposal abstract
Up to 47% of patients requiring knee arthroplasty only have unicompartmental disease / osteoarthritis and are therefore suitable for UKA rather than TKA. Advantages of UKA over TKA include shorter length of stay, faster recovery time, lower costs, better functional outcomes and lower perioperative morbidity and mortality.
However, in national registries (including the Dutch LROI), UKA shows inferior survival compared to TKA. Therefore, the choice of implant in patients with medial osteoarthritis of the knee still remains subject of discussion.
To gain further knowledge in this dilemma, a retrospective, registry-based cohort study will be conducted comparing these two procedures for patients with medial osteoarthritis. Data from all patients undergoing TKA and UKA will be obtained, from the period since location of osteoarthritis in patients receiving TKA is included in the LROI form (2022 until now). Consequently, implant survival and patient reported outcome measures of medial UKA will be compared to TKA for patients with medial osteoarthritis of the knee.