Please, provide some detail. Give a bit history for how long the pt suffer that problem. What was the onset, sudden, gradual? Is there any morning stiffness? And How long that lasts - less than one hour or more than one hour? Are they any red flags present? Also give some detail of clinical examination. What do you find on inspection- any postural deviation apart from lumbar lordosis? What do you find on palpation? Is there pain elicited on percussion of his spine indicating the possibility of infection (like TB Spine), tumour? Examine his Range of motion of spine and note which one is limited. Perform a through neurological examination for his lower limb noting sensory, motor, reflex deficit apart from SLR. Just feed back your results to us.