Sciatica Nerve Root Calculator
Pinpoint the exact nerve root and disc level behind your symptoms in under 60 seconds — based on clinical dermatome mapping.
No data stored. 100% private. Based on dermatome research.
Most Likely Nerve Root
Disc Level
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Severity
Confidence
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How the Sciatic Nerve Map Works
The sciatic nerve is the largest nerve in your body — roughly the diameter of your thumb — formed by nerve roots L4 through S3 exiting the lumbar spine. When a disc herniates and compresses a specific root, the pain follows a predictable path called a dermatome: a specific skin区域 served by that nerve.
This calculator cross-references your pain location, character, and aggravating factors against established dermatome charts from orthopedic research (Netter, 2019; Bogduk, 2005). Each nerve root produces a distinct pattern:
Pain Pattern + Aggravation → Nerve Root → Disc LevelDermatome correlation: 89% concordance with EMG-confirmed radiculopathy (Dillingham et al., Spine 2001)L4 root (L3-L4 disc): Front thigh and inner knee. Often mistaken for hip or quadriceps problems. The femoral nerve pathway. Rare — about 10% of sciatica presentations.
L5 root (L4-L5 disc): The most common single root involved. Pain radiates down the outer leg, across the top of the foot, and into the big toe. The peroneal nerve pathway. Weakness shows as foot drop or difficulty heel-walking.
S1 root (L5-S1 disc): Classic sciatica. Buttock → back of thigh → calf → bottom or outer foot. The tibial nerve pathway. Difficulty rising on tiptoes. The most commonly herniated disc level (AAOS, 2023).
S2-S3 roots: Rare in isolation. Inner thigh and perineal region. If pain is here plus bowel/bladder changes, seek emergency evaluation — this may indicate cauda equina syndrome.
What Your Severity Score Means
Your severity rating combines pain character intensity, aggravation factor loading, and symptom duration into a clinical risk estimate. Here's how to interpret it:
Peripheral sensitization. Nerve is irritated but not significantly compressed. Most cases resolve with targeted self-care within 4–6 weeks. Focus: nerve flossing, walking, position modification. McGill Big 3 for spinal stability (McGill, 2015).
Active nerve root compression. Disc material is contacting the nerve with measurable inflammatory response. Consider PT referral. McKenzie method shows 60-80% directional preference success (May & Rosedale, 2019). Avoid prolonged sitting >30 min.
Significant nerve compression. If progressive weakness (foot drop, can't heel/toe walk) or bowel/bladder changes → urgent evaluation needed. Imaging indicated. Surgical consultation if 6+ weeks failed conservative care (NICE Guidelines, 2023).