24420155
OBJECTIVE	The purpose of this prospective , randomised study was to evaluate long-term clinical results , radiographic findings , complications and revision and survivorship rates in patients < 55 years at a minimum of 16 years after undergoing bilateral , sequential , simultaneous , cemented and cementless total knee arthroplasties ( TKAs ) in the same patients .
METHODS	Bilateral , sequential , simultaneous TKAs were performed in 80 patients ( 160 knees ) .
METHODS	There were 63 women and 17 men with a mean age of 54.3 years ( range 49-55 ) , who received a cementless prosthesis in one knee and a cemented prosthesis in the other .
METHODS	The mean follow-up was 16.6 years ( range 16-17 ) .
RESULTS	At final review , the mean Knee Society ( KS ) knee scores ( 95.8 versus 96.9 ) , Western Ontario and McMaster Universities ( WOMAC ) osteoarthritis ( OA ) index ( 25.4 versus 25.9 ) , range of motion ( ROM ) ( 125 versus 128 ) , patient satisfaction ( 8.1 versus 8.3 ) and radiological results were similar in both groups .
RESULTS	Femoral component survival rate was 100 % in both groups at 17 years ; at 17 years , the cemented tibial component survival rate was 100 % and the cementless tibial component 98.7 % .
RESULTS	No osteolysis was identified in either group .
CONCLUSIONS	Long-term results of both cementless and cemented TKAs were encouraging in patients with OA who were < 55 years .
CONCLUSIONS	However , we found no evidence to prove the superiority of cementless over cemented TKAs .

