Is It Sciatica or a Hamstring Strain?

Back-of-thigh pain is one of the more commonly misdiagnosed presentations in musculoskeletal practice. Patients often present having been told they have a hamstring strain when the source is actually the sciatic nerve - or vice versa. The distinction matters because the treatments are different and doing the wrong one can make things worse.

Sciatic nerve pain

True sciatica originates from irritation or compression of the sciatic nerve, most commonly from a disc herniation or stenosis at L4-L5 or L5-S1. The pain is typically described as burning, sharp, electric, or shooting. It often travels from the lower back through the buttock and down the back of the leg, sometimes as far as the foot. Coughing, sneezing, and prolonged sitting tend to provoke it. Numbness or tingling along the leg may accompany the pain.

Hamstring strain

A hamstring strain comes on acutely during a sprint or sudden eccentric load. The pain is localised to the muscle belly (mid-thigh) or to the proximal attachment near the ischial tuberosity (sitting bone). There is tenderness on palpation of the muscle, and pain reproduces with resisted knee flexion and active straight leg raise. There's no radiation below the knee and no neurological symptoms.

The key distinguishing tests

• Slump test or straight leg raise: positive (reproduces leg pain) in sciatica, negative in hamstring strain
• Palpation: hamstring strain is tender on direct pressure; sciatica is not reproducible by pressing the thigh
• Resisted strength: hamstring strain produces pain and weakness on resisted knee flexion; sciatica may show weakness but not localised pain
• Location: mid-thigh belly pain points to hamstring; pain at the ischial tuberosity may be high hamstring tendinopathy or nerve involvement

When it's both

In some cases - particularly at the proximal hamstring - the sciatic nerve and the hamstring tendon are in close proximity and both can be involved. High hamstring tendinopathy can sensitise the adjacent sciatic nerve. A thorough assessment is needed to tease these apart.