Does Patellar Resurfacing Matter? Midterm Follow-Up of MRK Total Knee Replacement
Dhrumin Sangoi1, Nikhil Gokhale1, Sanat Kulkarni2
1Trauma and Orthopaedic Department, Kingsmill Hospital, Sherwood Forest Hospital NHS Trust, Mansfield Road, Sutton-in-Ashfield, NG17 4JL UK.
Background:
Many designs of TKR have been developed to optimize the kinematics and improve satisfaction, including the 'medial rotating' philosophy. The purpose of this study is to report the mid-term clinical outcome of MRK knees and evaluate whether resurfacing the patella makes any difference in outcome.
Methods:
A retrospective analysis was done of 104 MRK total knee replacement done between 2008 and 2017. Patients were called for a review for evaluation of OKS, Baldini and Feller scores. Demographics of the patients, clinical outcome, complications were assessed.
Results:
62 had patellar resurfacing. Mean follow-up was 74.45 months in non- resurfaced and 54.93 months in resurfaced group. Mean flexion range in both groups at final follow-up was 101.45. Median OKS at follow-up was 36 (12-47) in non-resurfaced and 37 (9-48) in resurfaced group. Patella scores were better in resurfaced group-Baldini score median (range) was 90 (25-100) in non-resurfaced v/s 100 (30-100) in resurfaced, Feller score median (range) was 25 (12-30) in non-resurfaced v/s 28 (10-30) (p 0.042) in resurfaced. The patellofemoral component of the OKS (Q5 + Q7 + Q12) median showed an improvement from 3 (1-11) to 6.5 (3-11) in non-resurfaced and from 3 (0-12) to 8 (2-12) (p 0.039) in resurfaced group. There were five complications overall (4.8%).
Conclusion:
These results show a satisfactory outcome at mid-term follow-up. We found a statistically significant difference in Feller score and in the patellofemoral component of OKS between the groups of MRK knee suggesting specific benefits of patellar resurfacing with this implant.
