Comparison of fixed bearing and mobile bearing total knee arthroplasty using identical femoral component.
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.


METHODS
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.


CONCLUSIONS
MB prosthesis has no clinical advantage over FB at intermediate term follow-up despite using identical femoral component.
Department of Orthopaedic Surgery, Nopparat Rajatanee Hospital, Bangkok, Thailand. sakarin_md@hotmail.com
Sakarin
S
Wonglertsiri
Charoenwat
C
Uthaicharatratsame
D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D016896:Treatment Outcome