Diagnosis and symptoms6 min read
Is back pain radiating to the buttock always a herniation?
Pain spreading from the lower back into the buttock and thigh is almost always interpreted by patients as sciatica. There is another common cause of that pattern, however: trigger points in the back and hip muscles.
Which muscles refer where
The quadratus lumborum at the side of the waist refers pain to the upper outer buttock and the groin. It is a common cause of pain sharpening on getting out of bed and side bending.
The muscles at the side of the hip spread pain along the outer thigh toward the knee. This pattern is often confused with sciatica but does not go below the knee.
The piriformis, deep in the buttock, refers pain from the mid-buttock to the back of the thigh. Increasing with prolonged sitting is its most recognisable feature.
Findings that distinguish it from sciatica
Myofascial referral usually stays above the knee. Pain and numbness reaching the foot and toes suggest nerve root compression.
There is no sensory change or loss of reflexes in a myofascial picture. Weakness lifting the ankle or rising onto the toes indicates nerve involvement.
Reproducing the patient's familiar referred pain by pressing the relevant muscle is the strongest finding confirming a myofascial source.
Why it develops
Prolonged sitting both shortens and weakens the hip muscles. Together these create the most common ground for trigger points.
Standing on one leg, sitting cross-legged and carrying a child on one side create asymmetric load. Trigger points are usually one-sided in this picture.
Entering an unaccustomed activity unprepared is also a frequent trigger — gardening or moving house after a long inactive period belong here.
Key points
- A significant share of pain radiating to the buttock is muscular.
- Myofascial referral usually stays above the knee.
- Numbness reaching the foot suggests nerve root compression.
- There is no sensory change or reflex loss in a myofascial picture.
- Prolonged sitting both shortens and weakens the hip muscles.
Frequently asked questions
My MRI shows a herniation — can the pain still be muscular?
It can be, and often is. Herniations are found without pain in most people over forty. If your pain is reproducible by pressing the muscle on examination, the source is most likely muscular.
Is this the same as piriformis syndrome?
Close but not the same. In piriformis syndrome the muscle compresses the sciatic nerve and symptoms travel down the leg. In a myofascial picture the pain is referred from the muscle itself, not the nerve.
Is it normal for it to be one-sided?
It is normal and common. Asymmetric loading habits — standing on one leg, carrying a bag on one side — concentrate trigger points on that side.
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This content is for information only and does not replace medical diagnosis or treatment. Response to treatment varies between individuals. Please consult a healthcare professional about your symptoms.