Figure 6

The Double straight leg lower (DSLL) test (reproduced with permission from Movement Performance Solutions). The DSLL test was used to test the ability to prevent extension and flexion of the lumbar spine during defined movement of the legs, performed supine. The test was classified as a high threshold test. Photos illustrates examples of views during the test. Start position; The subject lay in crook position (45° hip flexion), knees and feet together with arms folded across chest. A pressure biofeedback unit (Chattanooga Group, Hixon, TN) was positioned between the lumbar lordosis and bench and inflated to a pressure of 40 mmHg. Test movement; While preventing the lumbar spine from moving (monitored with pressure biofeedback unit) the subject lifted both feet off the bench to 90° hip flexion, then lowered and straightened both legs to fully extended, and then back to 90° hip flexion. Criteria: Pass: < 5 mmHg away from 40 mmHg while no movement in lumbar spine.