Purpose: This study compared isokinetic knee strength profiles by knee surgery history in basketball players. Methods: A total of 17 professional female basketball players (age, 23.7±3.8 years) participated in this study. All the participants performed maximal isokinetic knee strength test concentrically at a velocity of 60°• sec −1 and 180°• sec −1 . Strength variables included peak torque (PT), body mass normalized PT (NPT), bilateral strength difference (BD), hamstrings to quadriceps

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... (H/Q) ratio. Independent t-test and one-way analysis of variance were used to compare mean differences in the measured parameters by knee surgery history and limb-based sugroups, respectively. Results: Nine subjects had a history of knee surgery. At all velocities, there were no significant group differences in PTs, NPTs, BDs, and H/Q ratios of the knee extensor and flexor muscles by knee surgery history. Overall, NPTs of knee extensor and flexor muscles were 2.91−3.01 N• m• kg −1 and 1.55−1.59 N• m• kg −1 , respectively, and H/Q ratios ranged from 52% to 55%. At 180°• sec −1 . NPTs of knee extensor and flexor muscles were 1.90−1.92 N• m• kg −1 and 1.08−1.10 N• m• kg −1 , respectively, and H/Q ratios ranged from 57% to 58%. Conclusion: The current findings suggested that isokinetic knee strength profiles measured at 60°• sec −1 and 180°• sec −1 velocities were similar regardless of a history of knee surgery in the professional female basketball players.