You have been treating lower back and hip pain as a back problem for six months. Or a hip problem. Whichever one you chose, the treatment has not worked the way it should.
Lower back and hip pain overlap in ways that make the source hard to identify from location alone. All three structures share territory: nerve pathways, referral zones, and muscular attachments. Months of treatment aimed at the wrong one can feel like progress that never arrives. A back pain evaluation that covers hip mechanics alongside the spine is where the correct source finally gets identified.
Why Lower Back and Hip Pain Get Confused So Often
The lumbar spine and the hip joint share nerve pathways, muscular attachments, and referral patterns. Location alone is an unreliable guide. Pain from a lumbar disc herniation radiates through the buttock and into the lateral thigh, territory that looks and feels like hip pain. Pain from hip arthritis refers into the lower back and groin without producing obvious symptoms at the hip itself.
Their overlapping pain patterns produce a diagnostic problem. Many patients spend months in the wrong treatment lane because the initial evaluation committed to one source without testing the others.
The Anatomy Behind the Overlap
Lumbar nerve roots exit between L3 and S1 and supply the hip region, the thigh, and the groin. Hip joint innervation comes primarily from branches of the femoral and obturator nerves. Both systems produce pain somewhere between the lower back and the upper leg, which is why patients describe a region rather than a point.
The sacroiliac joint connects the sacrum, the triangular bone at the base of the spine, to the ilium, the broad pelvic bone. Dysfunction there produces pain in the lower back, buttock, and hip that resembles both lumbar and hip pathology. The SI joint is the last structure confirmed rather than the first: its pain pattern borrows from both territories.
How to Read Where Your Pain Actually Is
Groin Pain vs. Buttock Pain: The Location Test
Where pain appears when the hip moves through its range is a reliable starting point. Pain in the groin when the hip is rotated, flexed, or loaded points toward hip joint pathology. Joint-sourced pain refers to the groin because that is where the hip joint’s nerve supply concentrates.
Pain in the buttock or along the lower back during hip movement points toward a lumbar or SI joint source. Loading or extending the spine does not change it. A clinician working through a case like this asks two questions: where does it hurt when the hip moves, and where when the spine bends? In most cases those two questions point in different directions, and that difference tells the clinician where to look.
What Happens When You Move Your Hip vs. Your Spine
Clinicians use two physical tests as standard first steps. The FABER test (flexion, abduction, and external rotation of the hip) stresses the hip joint and the SI joint at once. Pain reproduced in the groin during FABER points to the hip joint. Pain in the buttock or lower back during FABER points toward the SI joint.
A straight leg raise stresses the lumbar nerve roots. Reproducing leg or back pain with the straight leg raise at 30 to 70 degrees points toward lumbar disc involvement rather than hip pathology. Reading these two tests together lets a clinician narrow the likely source before ordering imaging.
The SI Joint: Where the Two Systems Meet
For patients whose lumbar and hip treatments have not produced relief, the sacroiliac joint is the source that was never tested. SI joint pain covers both territories. Standard X-ray does not show it clearly. It does not produce the leg pain pattern that makes lumbar disc problems easier to recognize.
Sacroiliitis, inflammation of the SI joint, arrives as a diagnosis after other treatments fail more than it is found first. A sacroiliac joint injection can serve as both diagnostic confirmation and treatment in the same procedure once the SI joint is confirmed as the source.
Conditions That Produce Lower Back and Hip Pain at the Same Time
Hip osteoarthritis is one of the more common culprits when both structures are affected rather than one mimicking the other. Reduced range of motion at the hip forces the lumbar spine to compensate with each stride. Lumbar strain builds over months and presents before the hip itself becomes symptomatic. A patient may be treated for lumbar degeneration for a year before anyone images the hip.
Lumbar disc herniation at L3-L4 or L4-L5 radiates into the hip and thigh through the femoral nerve distribution. Piriformis syndrome compresses the sciatic nerve as it passes through the piriformis muscle in the hip region. The pain pattern resembles both sciatica and hip pain. Each responds to joint pain treatment differently depending on which structure is the primary driver, which means settling that question before starting treatment.
How This Gets Diagnosed Correctly
The diagnostic injection is where the process becomes definitive. Local anesthetic injected into the hip joint under fluoroscopic or ultrasound guidance tells the clinician whether the hip joint is the source. If pain temporarily resolves, the hip is confirmed. If pain does not change with a confirmed intra-articular hip injection, the evaluation moves to the lumbar spine or SI joint.
Imaging alone cannot do this work. Both hip arthritis and lumbar disc disease are common in adults over 50. Finding pathology on an MRI does not confirm that pathology is generating the pain.
A targeted injection combined with the physical examination produces a more accurate answer than either does alone. Practices with integrated hip and back pain care run these assessments in sequence. A diagnosis arrives faster than routing the patient through separate spine and orthopedic consultations.
Frequently Asked Questions About Lower Back and Hip Pain
Can a bad hip cause lower back pain?
Yes. Hip arthritis reduces available range of motion at the hip joint, so the lumbar spine begins compensating with each step. Cumulative lumbar strain builds from that compensation and appears as lower back pain, sometimes well before the hip itself becomes symptomatic. Adults whose lower back pain does not respond to standard care should have the hip assessed as a contributing source.
How do doctors tell the difference between hip pain and back pain?
Physical examination tests come first. Physical examination starts with the FABER test and the straight leg raise. When those are inconclusive, a guided injection into the suspected structure, the hip joint or the SI joint, that produces temporary relief confirms the source. Imaging identifies structural pathology but cannot confirm which finding is generating the pain.
Should I see a spine doctor or an orthopedic doctor for lower back and hip pain?
A pain specialist who evaluates both systems is a more direct route for many patients. Overlap between these two structures is well-described in the medical literature. A clinician working across both runs the full diagnostic sequence without routing the patient between departments. Spine-only or hip-only evaluations regularly miss the SI joint because it does not fall cleanly into either specialty’s scope.
When to Stop Guessing and Get an Evaluation
Lower back and hip pain that has not responded to treatment after six to eight weeks is a reliable indicator that the correct source has not been identified. Compensatory patterns between the hip and the lumbar spine build over time. Secondary structures bearing load they were not designed for accumulate dysfunction in both areas over time. Getting the source right early produces a shorter course of care than exhausting one possibility at a time.
Sources:
Hip-Spine Syndrome: A Review, National Library of Medicine
Hip Arthritis, American Academy of Orthopaedic Surgeons
