Straight Leg Raise
Definition
A clinical test where the client lies supine and one leg is raised with the knee extended. Measures hamstring length and neural tension (sciatic nerve mobility). Normal range is approximately 70-90 degrees. Limited by hamstring tightness, sciatic nerve tension, or pelvic posterior tilt compensation. Also known as SLR.
Clinical Significance
The straight leg raise differentiates hamstring flexibility from neural tension. If the range improves with ankle dorsiflexion release (reducing neural tension), the limitation is neural rather than muscular -- and the intervention changes. Bilateral asymmetry in SLR is a common finding in the Left AIC pattern. The test also has orthopedic screening value for lumbar disc pathology when combined with neural tension signs (Lasegue sign).
How AKMI Assesses This
AKMI performs the straight leg raise bilaterally and records the angle at onset of firm resistance. The test is performed with and without ankle dorsiflexion to differentiate muscular from neural limitation. Left vs. right comparison is correlated with pelvic tilt data and hip rotation findings.
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