Sciatica: Is It Your Back or Your Hip? (The Answer Changes Everything)

Not all sciatica is the same, and treating lumbar radiculopathy the same way you treat piriformis syndrome is a path to months of unnecessary frustration. Here's how to tell the difference — and why it matters.

Sciatica is one of the most frequently used and most frequently misapplied diagnoses in musculoskeletal medicine. Strictly speaking, sciatica refers to pain caused by compression or irritation of the sciatic nerve — but the sciatic nerve can be compressed at multiple points along its path, and each source requires a different approach.

Two people can present with nearly identical symptoms — pain running from the buttock down the back of the leg — and have completely different underlying causes. One needs lumbar-focused treatment. The other needs hip-focused treatment. If you treat them the same way, one of them isn't going to get better.

The anatomy

The sciatic nerve is formed by nerve roots from L4–S3, exits the lumbar spine through the neural foramina (the openings between vertebrae), passes through the deep gluteal region — beneath the piriformis muscle — and then runs down the back of the thigh to the knee, where it divides. It can be compressed at the nerve root level in the spine, or it can be compressed further downstream at the deep gluteal space by the piriformis or surrounding structures.

Lumbar radiculopathy (true sciatica)

Lumbar radiculopathy is nerve root compression at the spine — most commonly from a disc herniation, though stenosis and foraminal narrowing are also causes. The key characteristics:

• –Pain follows a specific dermatome pattern — typically L4 (front and inner lower leg), L5 (outer lower leg and top of foot), or S1 (outer foot and sole, back of calf).
• –Neurological signs may be present: weakness in specific muscle groups (dorsiflexion weakness from L4/L5, plantar flexion weakness from S1), diminished reflexes (patella for L4, ankle jerk for S1).
• –Symptoms are typically worsened by lumbar flexion (sitting, bending forward) for disc herniations, and lumbar extension (standing, walking) for stenosis.
• –Positive straight leg raise test: lying flat and having the leg passively raised by the examiner reproduces the radiating pain at relatively low elevation (under 70 degrees).

Piriformis syndrome / deep gluteal syndrome

When the sciatic nerve is compressed in the deep gluteal space — either by the piriformis muscle, the obturator internus, gemelli, or other structures in that region — the presentation looks similar but the details differ:

• –Pain originates in the buttock, often with a deep aching quality, and may radiate down the back of the thigh.
• –Neurological signs (weakness, reflex changes) are typically absent, because the compression is at the nerve trunk level rather than the nerve root.
• –Symptoms often worsen with sitting on hard surfaces, particularly for prolonged periods.
• –Resisted hip external rotation or passive hip internal rotation may reproduce symptoms.
• –Straight leg raise is usually negative or only mildly positive.
• –Lumbar flexion and extension don't reliably change symptoms the way they do with disc-related pathology.

Why the distinction matters for treatment

Lumbar radiculopathy is treated with lumbar-focused interventions: lumbar extension exercises (McKenzie method) for disc herniations where centralization occurs, neural mobilization techniques, and if conservative care fails, epidural steroid injections or surgical consultation for severe or non-resolving cases. Loading the hip or stretching the piriformis aggressively with lumbar radiculopathy doesn't address the source and can be irritating.

Deep gluteal syndrome is treated with hip-focused work: reducing compression and tension at the deep hip rotators, progressive hip strengthening, and targeted soft tissue work to the deep gluteal muscles and surrounding structures. Lumbar-focused treatment misses the actual compression site entirely.

Getting the right diagnosis

A skilled clinician can differentiate these presentations with a thorough history and physical examination — nerve tension tests, movement testing, neurological examination, and provocation tests. MRI is useful when the diagnosis is unclear or when surgical planning is needed, but it isn't always necessary and shouldn't be the first step. Many disc herniations and piriformis presentations can be correctly diagnosed and treated clinically without imaging.

What doesn't work for either

Passive rest prolongs both conditions. Movement — appropriate, graduated, based on what provokes and what relieves — is consistently better than immobility. Bed rest for sciatica is associated with slower recovery in clinical studies. The goal is to find the positions and movements that centralize or reduce symptoms, and progressively expand from there.