Problem: Chris is a 28-year-old male who complains of lower back pain that began 3 days ago. The pain is worse when he stands or bends, and it is somewhat relieved when he sits. The clinician performs the straight-leg raise test and it is negative. Plain film x-ray is negative. Which diagnosis is most likely? Looking for Assignment Help? Osteoarthritis Spinal stenosis Scoliosis Muscle strain