The thoracolumbar junction — roughly the T12-L1 region, where the relatively rigid thoracic spine meets the more mobile lumbar spine — takes a disproportionate share of rotational and transitional load. When this junction becomes dysfunctional, it can refer pain well away from its actual location, a pattern first described in detail by Dr. Robert Maigne and often called Maigne's syndrome.
Why the referral pattern is confusing
The cluneal nerves, which supply sensation to the buttock and lateral hip, originate from this thoracolumbar level. Irritation here can refer pain into the low back, buttock, groin, or lateral hip — closely mimicking sacroiliac joint dysfunction, hip pathology, or general "low back pain," which is exactly why it's frequently misdiagnosed or missed entirely.
Typical presentation
- Low back, buttock, groin, or lateral hip pain that doesn't consistently reproduce with classic SI joint or hip provocation tests
- Point tenderness directly over the T12-L1 facet joints and the adjacent iliac crest
- A tender "trigger point" at the iliac crest where the cluneal nerve crosses — often the most reliably reproducible finding
- Pain that hasn't responded to treatment focused purely on the lumbar spine, SI joint, or hip
- Reduced or painful rotation specifically at the thoracolumbar junction
How we differentiate it
The key is deliberately examining the thoracolumbar junction itself, not just the area where the patient feels pain. Reproducing the patient's familiar pain with palpation or provocation at T12-L1 — when hip and SI joint tests are otherwise unremarkable — is a strong indicator.
Treatment
Manipulation or mobilization of the thoracolumbar junction is usually the most direct and effective intervention, often producing rapid relief when the diagnosis is correct.
Soft tissue therapy for the surrounding paraspinal and quadratus lumborum musculature, which tends to guard around the dysfunctional segment.
Rotational mobility and postural correction to reduce ongoing strain at the junction, particularly for anyone with a seated, rotation-heavy occupation or sport.
Prognosis is generally very good once correctly identified. If you've had persistent low back, hip, or groin pain that hasn't responded to standard treatment, the thoracolumbar junction is worth specifically checking.