1.Clinical Outcome Scores Post Medial Unicompartmental Knee Arthroplasty: A Comparison of the MAKO Robotic Arm versus the Oxford Conventional Approach
Tan CMP ; Shih SSW ; Ravichandran V ; Quah ESH ; Kunnasegaran R
Malaysian Orthopaedic Journal 2025;19(No. 1):3-10
Introduction: Unicompartmental knee arthroplasty (UKA)
has significant advantages over total knee arthroplasty
(TKA). However, due to its need for precise positioning and
soft tissue balancing, UKA failures and revision rates may be
higher than that of TKA. Robotic-assisted UKA offers more
accurate implant positioning, soft tissue balancing, improved
lower limb alignment, and a reduction in surgical error.
There are few studies studying functional outcomes post
robotic-assisted UKA. The aim of this study was to compare
the functional outcomes between robotic-assisted and
conventional medial UKA.
Materials and methods: A retrospective review was done of
159 patients; 110 patients underwent conventional UKA
while 49 patients underwent robotic-assisted UKA. Outcome
measures included the Oxford Knee Score (OKS), Knee
Society Score (KSS), Visual Analogue Score (VAS) for pain,
and range of motion (ROM) at three months, one-year and
two years post-UKA.
Results: Pre-operative patient demographics and outcome
scores were not significantly different between both groups.
ROM was significantly greater in the MAKO compared to
the Oxford group at 3 months (p=0.039), 1 year (0.053) and
2 years (0.001) post-operation. While OKS, KSS and VAS
scores improved for both groups, there were no significant
differences in the final outcome measures. None of the
patients experienced a mechanical failure, infection, or
revision post-surgery. One patient each in the Oxford and
MAKO group suffered a periprosthetic fracture.
Conclusion: Both robotic-assisted MAKO UKA and
conventional Oxford UKA showed good clinical outcomes.
Robotic-assisted MAKO UKA had superior ROM outcomes
compared to conventional Oxford UKA up to two years postsurgery


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