At a median follow-up of 9.8 years ( range 4.9-11 .4 ) , the patients were evaluated using Lysholm score ( n = 25 ) , Knee Injury and Osteoarthritis Outcome Score ( KOOS , n = 25 ) , isokinetic quadriceps measurement and hamstring strength measurement ( n = 22 ) and standing radiographs ( n = 23 ) .