ArticleJournal of robotic surgery2025
Does preoperative varus alignment impact functional outcomes in robotic assisted medial unicompartmental knee arthroplasty? mid-term analysis.
Article in Journal of robotic surgery, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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6 authors.
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Abstract
The aims of our study are (1) to evaluate clinical outcomes of robotic-assisted medial unicompartmental knee arthroplasty (UKA) in varying degrees of varus deformities (2) what should be the target for correction of the varus deformities? (3) to validate intraoperative robotic hip-knee-ankle (HKA) axis (dynamic HKA) against HKA obtained from long leg radiographs (LLR) (static HKA). 212 fixed-bearing medial UKA performed from 2017 to 2024 with the help of a burr-based robot platform, were evaluated with a mean follow-up of 56 months. All the patients were classified on the basis of static HKA and dynamic HKA into three groups of varus deformities: mild (> 172°), moderate (168° to 172°), and severe (< 168°). The functional outcome was assessed using the Oxford Knee Score (OKS) and the modified Kujala Score (MKS). 85 (40.2%) had a mild, 94 (44.3%) moderate, and 33 (15.5%) had a severe varus preoperatively. All the patients demonstrated a significant increase in OKS, MKS after surgery (p < 0.001) with no difference between the three groups (p > 0.05). There was poor correlation between preoperative dynamic HKA and postoperative OKS, MKS (r = 0.06, r = 0.41). A good agreement was noted between the static and dynamic HKAs (96.2% preoperatively, 97.7% postoperatively). Degree of preoperative varus deformity does not negatively impact the functional outcomes to achieve satisfactory functional outcomes. The target postoperative HKA shouldbe correcting 50% of the preoperative varus deformity. Preoperative LLRs represent static alignment of the limb and can be safely done away with in high volume robotic centres.
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