RT Journal
A1 Metsovitis, Stergios R.
A1 Ploumis, Avraam L.
A1 Chantzidis, Paraskevas T.
A1 Terzidis, Ioannis P.
A1 Christodoulou, Anastasios G.
A1 Dimitriou, Christos G.
A1 Tsakonas, Athanasios C.
T1 Rotaglide Total Knee Arthroplasty: A Long-Term Follow-up Study
JF The Journal of Bone & Joint Surgery
JO The Journal of Bone & Joint Surgery
YR 2011
FD May 4
VO 93
IS 9
SP 878
OP 884
DO 10.2106/JBJS.I.01702
UL http://dx.doi.org/10.2106/JBJS.I.01702
AB Background: 
  Mobile-bearing knee designs represent an alternative to conventional fixed-bearing implants in total knee arthroplasty. The purpose of this study was to determine the clinical results of a mobile-bearing knee implant.Methods: 
  From 1990 to 1998, 326 primary consecutive mobile-bearing total knee prostheses were implanted in 260 patients who had a mean age and standard deviation of 66.7 ± 6.9 years. Femoral and tibial components were cemented in all knees, and the patella was resurfaced in 199 knees (61%). Patients were evaluated with the use of the Knee Society clinical rating system and radiographic examinations. Complications were noted, and survivorship of the prostheses was determined.Results: 
  The mean follow-up period was 156 ± 27.3 months, with maximum follow-up at eighteen years. The mean Knee Society knee score improved from 32.4 ± 21.2 preoperatively to 92.6 ± 10.0 at the time of the last follow-up (p = 0.00), and the mean Knee Society functional score improved from 39.3 ± 18.7 preoperatively to 66.7 ± 18.6 at the time of the last follow-up (p = 0.00). Mean knee flexion improved from 92.3° ± 14.5° preoperatively to 112.1° ± 13.4° at the time of the last follow-up (p = 0.00). There were twenty-four (7.4%) knees that required revision. In eighteen (5.5%) knees, worn out or broken polyethylene was found and a polyethylene-only exchange was done. Six knees (1.8%) were fully revised. The survival rate was 0.96 (95% confidence interval, 0.93 to 0.98) at ten years and 0.87 (95% confidence interval, 0.79 to 0.93) at eighteen years.Conclusions: 
  A fully congruent, mobile-bearing total knee prosthesis had excellent survivorship during the ten to eighteen-year follow-up interval.Level of Evidence: 
  Therapeutic Level IV. See Instructions to Authors for a complete description of levels of evidence.