2023 ISAKOS Biennial Congress ePoster
Joint Line Orientation After Fixed-Bearing Medial Unicompartmental Knee Arthroplasty Correlates Well With Patient Reported Outcome Measures When Compared With Matched Total Knee Arthroplasty Subsets – Prospective Observational Study
Saurabh Gupta, MS, SICOT Diploma, DNB Ortho, FJR(AIIMS New Delhi), Jodhpur, Rajasthan INDIA
Abhay Elhence, MS, MCH, Jodhpur, Rajasthan INDIA
All India Institute of Medical Sciences (AIIMS), Jodhpur, JODHPUR, Rajasthan, INDIA
FDA Status Not Applicable
Summary
The JLOA after FBM-UKA was either horizontal or mildly medially tilted which was statistically not significant and positively correlated with PROMs. An extreme medial tilt of the JLOA was associated with poorer postoperative outcomes of FBM-UKA
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Abstract
Introduction
Joint line orientation angle (JLOA) is the angle between the knee joint line and the horizontal line parallel to the floor. It has been reported to be one of the key factors related to postoperative outcome after Total knee arthroplasty (TKA). However, no study reports impact of JLOA on patient reported outcome measures (PROMs) in fixed bearing medial Unicompartmental Knee Arthroplasty (FBM-UKA). Aim of our study is to evaluate the relationship between JLOA and PROMs after FBM-UKA compared to Matched TKA patients.
Methods
This is a single centre prospective study approved by institutional review board. Study included 56 knees in 56 patients with medial compartment osteoarthritis who underwent unilateral FBM-UKA with almost normal opposite knee. All patients were compared with matched TKA patients. Matching was done based on age, gender, BMI, CCI, implant used and side operated. Patients were selected as per standard radiological decision aid. Their postoperative JLOAs was measured by full-leg- length standing coronal radiographs. Matched TKA was taken as control. PROMs were measured in terms of Oxford knee score (OKS) and knee society satisfaction score (KSS).
Results
Postoperative JLOA in normal and operated knee were 0.3 ± 2.4° and 0.7 ± 2.6°, respectively. The JLOA was either horizontal or mildly tilted medially which was statistically not significant when compared with matched TKA. The JLOA significantly positively correlated with the improvement of the PROMs (Oxford Knee Score (OKS), P < 0.001).
Conclusion
The JLOA after FBM-UKA was either horizontal or mildly medially tilted which was statistically not significant and positively correlated with PROMs. An extreme medial tilt of the JLOA was associated with poorer postoperative outcomes of UKA.