Comparison of Fixed Bearing and Mobile Bearing Total Knee Arthroplasty Using Identical Femoral Component

Sakarin Wonglertsiri MD*, Charoenwat Uthaicharatratsame MD*

Affiliation : * Department of Orthopaedic Surgery, Nopparat Rajatanee Hospital, Bangkok, Thailand

Background : The theoretical advantages of Mobile bearing (MB) prosthesis does not appear to be documented in terms of functional outcomes compared to Fixed bearing (FB) designs. Rarely that two identically designed knee prostheses were compared in the literature.
Objective : Compare clinical and functional results of MB and FB prostheses using identical femoral components at intermediate term follow-up. Material and Method: Total knee arthroplasties (TKA) performed between January 2004 and December 2006 at Nopparat Rajatanee hospital were retrospectively reviewed. The American Knee Society scoring system and functional score were used for outcome measurement.
Results : There were 102 and 103 patients in FB and MB group respectively. At the average follow-up of 75 months for FB and 73 months for MB group, the knee scores and functional scores of both groups had obviously improved from the preoperative period. However, no statistically significant differences were noted between the two groups. One patient in the MB group developed infected loosening 5.1 years after the operation and had two stages revision successfully done.
Conclusion : MB prosthesis has no clinical advantage over FB at intermediate term follow-up despite using identical femoral component.

Keywords : Mobile bearing total knee arthroplasty, Fixed bearing, Identical femoral component

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