Deep Gluteal Syndrome — When Buttock Pain Mimics Sciatica

Polish version · Explore Hip Conditions

Deep gluteal syndrome can cause buttock pain that radiates into the back of the thigh, particularly when symptoms worsen with sitting. It refers to irritation or entrapment of the sciatic nerve outside the spine, within the deep tissues of the buttock. Not every case is “piriformis syndrome”, however, and diagnosis requires excluding more common causes arising from the lumbar spine, hip and pelvis.

What is deep gluteal syndrome?

The sciatic nerve leaves the pelvis and enters the lower limb through a space deep beneath the gluteal muscles. In this region it may be irritated by fibrous bands, abnormal muscle tension or anatomy, scar tissue after injury or surgery, a space-occupying lesion, or conflict between bony and soft-tissue structures.

“Piriformis syndrome” describes only one possible mechanism. The broader term deep gluteal syndrome does not assume in advance which structure is responsible for the compression. This helps prevent the diagnostic process from being reduced to one muscle and one clinical test.

What symptoms are typical?

• deep, usually one-sided buttock pain;
• radiation into the back of the thigh, sometimes farther down the leg;
• worsening with prolonged sitting, especially on a hard surface;
• pain during certain hip movements, running or walking uphill;
• deep tenderness in the buttock;
• sometimes tingling or altered sensation along the course of the sciatic nerve.

In a systematic review of 14 studies involving 853 patients, recurring features included posterior hip pain, sciatica-like symptoms and difficulty sitting for about 30 minutes. None of these features, on its own, confirms the diagnosis.

Could the symptoms be coming from the spine?

The presentation can resemble lumbar radicular pain, so an important first step is to determine whether the sciatic nerve or its roots are being irritated by a disc lesion, spinal stenosis or another lumbar condition. Spinal causes are more often accompanied by low-back pain, radiation aggravated by coughing or sneezing, changes in reflexes, or weakness in specific muscle groups. These features are helpful, but none is an absolute rule.

A similar pattern can also arise from the hip joint itself, the sacroiliac joint, the proximal hamstring origin, ischiofemoral impingement or other pelvic disorders. The overall pattern of symptoms and examination findings therefore matters more than any single test.

More: hip conditions and causes of hip-region pain →

How is deep gluteal syndrome diagnosed?

History and clinical examination

The examination considers where the pain is felt, its relationship to sitting and movement, hip range of motion, strength, sensation and reflexes. Provocative manoeuvres that tension or activate the deep hip rotators may be used, while the lumbar spine and other possible sources of pain are assessed as well. A positive provocative test can increase suspicion, but it should not determine the diagnosis by itself.

X-ray, MRI and ultrasound

X-rays can help assess the bones of the hip and pelvis. Lumbar MRI may be needed to look for disc disease or stenosis, while pelvic MRI can identify a lesion compressing the nerve, oedema, scar tissue or conflict within the deep gluteal space. A normal scan does not always exclude functional or intermittent nerve irritation.

Ultrasound can show accessible portions of the sciatic nerve, selected muscles and fluid collections, and it allows side-to-side comparison. Its particular advantages are dynamic assessment and accurate guidance for a diagnostic injection. Depth of the structures and individual body habitus can limit the examination, however, so a normal ultrasound does not end the diagnostic process.

EMG and diagnostic injection

Nerve-conduction studies and electromyography can help distinguish a local problem from nerve-root injury or a more advanced neuropathy, but a normal result does not exclude local, position-dependent irritation. Temporary pain relief after a targeted image-guided injection can support a diagnostic hypothesis, but it does not replace a complete clinical assessment.

How is deep gluteal syndrome treated?

Treatment usually begins without surgery: reducing positions that reliably provoke symptoms, gradually adjusting load, physiotherapy directed at the hip, pelvis and spine, and appropriately selected neural-gliding exercises. Analgesic or anti-inflammatory medication should be matched to the patient’s health, risks and contraindications.

An ultrasound-guided or otherwise image-guided injection may be considered when there is a specific anatomical hypothesis and the procedure is intended to answer a defined diagnostic or therapeutic question. It should not be performed blindly or repeated without assessing the response and reconsidering the diagnosis.

More: injection treatments in orthopaedics →

Surgery is rarely required. It may be considered when there is well-documented compression from a space-occupying lesion or persistent symptoms despite appropriately conducted non-operative treatment. A review of 13 studies involving 508 patients rated the overall quality of the evidence as low and did not show one conservative treatment to be clearly superior to the others.

When is urgent assessment needed?

Urgent medical assessment is needed for rapidly progressive leg weakness or foot drop, numbness in the saddle area, new bladder or bowel dysfunction, severe pain after injury with inability to bear weight, fever with worsening pain, or sudden signs of impaired circulation in the leg. These symptoms should not be attributed to the piriformis muscle without further assessment.

Key point for an orthopaedic surgeon

Deep gluteal syndrome is a possible, but not the most common, cause of buttock pain and sciatica-like symptoms. The diagnosis should emerge from agreement between the history, examination and appropriately selected investigations. Treatment usually begins conservatively, and a normal result from a single imaging study is not enough either to confirm or exclude the condition.

References

1. Kizaki K, Uchida S, Shanmugaraj A, et al. Deep gluteal syndrome is defined as a non-discogenic sciatic nerve disorder with entrapment in the deep gluteal space: a systematic review. Knee Surg Sports Traumatol Arthrosc. 2020;28:3354–3364. DOI: 10.1007/s00167-020-05966-x. PubMed.
2. Hopayian K, Mirzaei M, Shamsi MB, Arab-Zozani M. A systematic review of conservative and surgical treatments for deep gluteal syndrome. J Bodyw Mov Ther. 2023;36:244–250. DOI: 10.1016/j.jbmt.2022.12.003. PubMed.
3. Park JW, Lee YK, Lee YJ, et al. Deep gluteal syndrome as a cause of posterior hip pain and sciatica-like pain. Bone Joint J. 2020;102-B:556–567. DOI: 10.1302/0301-620X.102B5.BJJ-2019-1212.R1. PubMed.

Content prepared by: Tomasz Poboży - orthopaedic surgeon.