Abstract
Aim: To ascertain if a medial rotation platform knee replacement design (MRK; Finsbury Orthopaedics) exhibits improved range of motion (ROM) and functional outcome compared to a conventional single radius condylar knee replacement system (PFC Sigma; Depuy) at one year.
Methods: Eighty patients undergoing total knee arthroplasty(TKA) were prospectively randomised and allocated to either receive the MRK or PFC Sigma pros-thesis. Patients were blinded to the choice of implant. Follow-up clinical and radiological evaluations were carried out by a single clinician so as to avoid interob-server error. Validated patient based scores including the Total Knee Function Questionnaire (TKFQ) were used to assess patient function.
Results: The average ROM in the MRK group was 108.53°. In the PFC Sigma group it was 94.16°. Statistical significance was demonstrated between the two groups.
The MRK group showed superior results in the TKFQ score which assesses activities of daily living as well as recreational and sporting activities. The movement and lifestyle component of the TKFQ, and the Knee Society Score were better in the MRK group with statistical significance.
No difference was demonstrated between the two groups with respect to radiological analysis, WOMAC Knee, Oxford Knee and SF-36 scores.
6 out of 40 patients in the MRK group compared to 5 out of 40 patients in the PFC group said that they had forgotten about their TKA at one year.
Conclusions: The medial rotation platform design confers increased ROM at one year with an associated benefit in movement and lifestyle and resultant patient satisfaction.
Correspondence should be addressed to: BASK c/o BOA, at the Royal College of Surgeons, 35–43 Lincoln’s Inn Fields, London, WC2A 3PE, England.
