Joint moments during squat and stoop lifting. The maximum ankle joint moment was larger in the squat lifting than in the stoop lifting. The knee joint moment was changed from extension moment to flexion moment during the squat lifting, however only the flexion moment was showed during whole period of the stoop lifting. The maximum hip joint moment was larger in the stoop lifting than in the squat lifting. The maximum lumbar joint moment was not different between the squat and stoop lifting significantly.