Yes. Fibrous and fibrovascular bands can physically entrap the sciatic nerve in the deep gluteal space, and this has been directly documented during endoscopic surgery. Scar adhesion can also restrict nerve mobility after trauma or surgery. The harder question is identifying that pathology nonoperatively. A 2020 retrospective case series proposed a clinical diagnostic pattern involving limited straight-leg raise, neural sensitization with dorsiflexion and reduced sciatic mobility on palpation, but those criteria have not yet been independently validated.
What is deep gluteal syndrome?
The sciatic nerve leaves the pelvis through the greater sciatic notch and runs through the deep gluteal space, beneath the gluteus maximus, past the piriformis, the obturator internus and gemelli, and the quadratus femoris before entering the back of the thigh. Deep gluteal syndrome describes entrapment of the nerve in that space.
A 2020 systematic review of 14 studies and 853 patients found that the condition was consistently defined by three features: it is non-discogenic, it is a sciatic nerve disorder, and the entrapment is in the deep gluteal space. Common features included posterior hip or buttock pain, radicular symptoms and difficulty sitting. Deep gluteal syndrome is best understood as a non-discogenic sciatic nerve entrapment disorder occurring beneath the gluteus maximus, and "piriformis syndrome" describes only one possible cause within it.
Can fibrous tissue physically entrap the sciatic nerve?
Yes. Imaging and surgical reviews describe fibrous bands as one of the recognized causes of sciatic entrapment in the deep gluteal space, alongside the piriformis, the obturator internus and gemelli, quadratus femoris and ischiofemoral pathology, proximal hamstring conditions, trauma, vascular structures and anatomic variants. One review described the recognition of fibrous bands as a radical change in how deep gluteal syndrome is diagnosed and treated, because they can limit how freely the nerve moves as the hip and knee change position.
The sciatic nerve normally glides and lengthens as the hip flexes and the knee straightens. A band that tethers the nerve can restrict that movement, which is why limited nerve mobility, rather than constant compression alone, is part of the proposed mechanism.
What surgeons actually see during endoscopy
The clearest evidence that fibrous tissue can entrap the nerve comes from endoscopic surgery, where the nerve and its surroundings are seen directly.
- Park et al., 2016: a retrospective review of 60 consecutive patients treated with endoscopic sciatic nerve decompression. The compromising structures identified were the piriformis, fibrovascular bundles, and adhesion with scar tissue. Pain on a visual analog scale fell from 7.4 to 2.6 and the modified Harris Hip Score rose from 81.7 to 91.8 at a mean follow-up of about two years. Patients without major trauma did better than those with major trauma.
- Aguilera-Bohorquez et al., 2018: a retrospective series of 44 operations in 41 patients. Fibrovascular bands were the most common identified cause of sciatic compression. Four cases needed revision at six months because of scarred tissue around the nerve.
- Elzeiny et al., 2025: a systematic review of 7 studies, 312 patients and 316 hips treated endoscopically after conservative care had not succeeded. Recognized causes included muscles and fibrous bands. Reported success rates ranged from 70% to 100%, with a recurrence rate of 2.5% and revision in 1.6%.
Endoscopic surgery has directly visualized fibrovascular bundles and scar adhesions restricting the sciatic nerve in selected patients with deep gluteal syndrome. These are surgical series of selected, refractory patients, and most of the evidence is retrospective. They establish that the pathology exists. They do not tell us how common it is in people with sciatica in general.
Fibrovascular bands vs. postoperative scar tissue
The terms describe related but different findings. Fibrovascular bands are bands of fibrous tissue, often containing small blood vessels, found around the nerve in patients without previous surgery in the area. Scar adhesion forms after trauma, surgery or injection and binds the nerve to surrounding tissue. The Aguilera-Bohorquez revisions are a reminder that scar can also form after the decompression itself. In both cases, the proposed problem is reduced nerve mobility and local irritation rather than a single point of pressure.
What the Brady 2020 study found
A 2020 retrospective case series evaluated a proposed clinical phenotype of sciatic nerve entrapment attributed to fibrous adhesion. Records of 132 patients presenting with low back pain at four U.S. clinics were reviewed. Patients were classified as having sciatic nerve entrapment due to fibrous adhesion when they met four proposed criteria:
- Straight-leg raise of 75° or less
- The straight-leg raise produced pain, tension or stiffness
- Adding ankle dorsiflexion at the end of the straight-leg raise increased symptom intensity or area
- Palpation suggested reduced sciatic nerve mobility in the deep gluteal space
Thirteen of 132 low-back-pain patients (9.8%) met the study's criteria as their primary diagnosis, involving 20 affected limbs. Symptoms had lasted an average of 24.6 ± 40.1 months, and 11 of the 13 patients (85%) had prior treatment failure.
After targeted Manual Adhesion Release®, straight-leg raise improved by an average of 20.8° and pain fell by 3.7 points. Straight-leg raise rose from 62.5° to 83.3°, and pain on the numeric rating scale fell from 5.8 to 2.1, a 64% median improvement. Patients estimated their improvement at 67.3% ± 25.4%. Maximum improvement took an average of 3.7 ± 1.7 treatments, and no complications were recorded.
What Brady 2020 does NOT prove
This study supports the clinical plausibility of an adhesion-related deep-gluteal entrapment phenotype, but it does not independently prove adhesion histologically. The study had no control group, the diagnostic criteria were proposed by the author, palpation reliability has not been independently validated, and treatment response partly informed the diagnostic interpretation.
Patients were also not followed long term, because other areas were treated after the straight-leg raise reached its maximum. The author disclosed that he was president of the organization that developed and trademarked Manual Adhesion Release®, which should be considered when interpreting the findings.
The 9.8% figure applies to this retrospective low-back-pain cohort using this proposed diagnostic system. It is not an estimate of how often sciatica, or low back pain in general, is caused by adhesion.
Why the endoscopic studies and Brady 2020 belong together
The endoscopic literature establishes that fibrovascular bands and scar adhesions can physically restrict the sciatic nerve. The Brady case series addresses a separate question: whether a recognizable clinical pattern may help identify some of those patients nonoperatively. Together they support the plausibility of adhesion-related deep gluteal entrapment while also showing why better prospective diagnostic studies are still needed.
Can the problem be diagnosed without surgery?
Not definitively. Diagnosis of deep gluteal syndrome combines history, examination, imaging and sometimes response to a diagnostic injection. Tenderness in the deep gluteal space, seated piriformis-type tests and neurodynamic findings raise suspicion. A restricted straight-leg raise that changes with ankle dorsiflexion can support a neural component, but it does not by itself localize the problem to the lumbar spine or the deep gluteal space.
Palpation of nerve mobility is a skilled examination, and the Brady paper itself notes that it has not been adequately tested for validity and reliability. At Novo, deep-gluteal tissue and nerve mobility may be assessed as part of the exam, but palpation alone is not presented as a validated test that proves a fibrous adhesion. The distinction from a lumbar nerve-root problem is covered in deep gluteal syndrome vs. lumbar radiculopathy.
What role does manual treatment have?
Targeted manual treatment has preliminary clinical evidence in a retrospective adhesion-entrapment case series, but prospective controlled trials are still needed. It is a reasonable option when the examination points to restricted deep-gluteal tissue and nerve mobility and nothing suggests a more urgent problem. It should not be described as proven to remove adhesions or as superior to other conservative care. Shockwave has separate randomized evidence in piriformis syndrome, reviewed in shockwave therapy for sciatica and deep gluteal syndrome.
When imaging or MR neurography may help
Lumbar MRI is the relevant study when a nerve-root problem is suspected. When deep gluteal entrapment is suspected or the source is unclear, pelvic MRI or MR neurography can show the sciatic nerve and surrounding structures and help exclude masses or other lesions. Imaging reviews describe MRI as the diagnostic procedure of choice for assessing deep gluteal syndrome, but it is not required in every case.
When surgical decompression is considered
For carefully selected patients who fail conservative care, endoscopic sciatic nerve release has reported favorable outcomes, although the evidence base remains largely retrospective. Surgery is usually considered after a sustained period of appropriate conservative treatment, with a diagnosis supported by examination, imaging and often a diagnostic injection.
How Novo approaches suspected sciatic nerve entrapment
We first determine whether the symptoms are neural, then localize the likely site of irritation: the lumbar spine, the deep gluteal space, the hamstring origin or somewhere else. Treatment, imaging or referral follows from that. See how we approach sciatica and sciatic nerve entrapment, or book a new patient exam.
References
- 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 Surgery, Sports Traumatology, Arthroscopy. 2020;28(10):3354-3364. PMID 32246173. (link)
- Hernando MF, Cerezal L, Pérez-Carro L, et al. Deep gluteal syndrome: anatomy, imaging, and management of sciatic nerve entrapments in the subgluteal space. Skeletal Radiology. 2015;44(7):919-934. PMID 25739706. (link)
- Carro LP, Hernando MF, Cerezal L, et al. Deep gluteal space problems: piriformis syndrome, ischiofemoral impingement and sciatic nerve release. Muscles, Ligaments and Tendons Journal. 2016;6(3):384-396. PMID 28066745. (link)
- Park MS, Yoon SJ, Jung SY, Kim SH. Clinical results of endoscopic sciatic nerve decompression for deep gluteal syndrome: mean 2-year follow-up. BMC Musculoskeletal Disorders. 2016;17:218. PMID 27206482. (link)
- Aguilera-Bohorquez B, Cardozo O, Brugiatti M, et al. Endoscopic treatment of sciatic nerve entrapment in deep gluteal syndrome: clinical results. Revista Española de Cirugía Ortopédica y Traumatología. 2018;62(5):322-327. PMID 29807785. (link)
- Elzeiny A, Giai Via R, Donis A, et al. Endoscopy for sciatic nerve entrapment in deep gluteal syndrome: a systematic review of literature. European Journal of Orthopaedic Surgery & Traumatology. 2025;35(1):223. PMID 40450109. (link)
- Brady W. Sciatic nerve entrapment due to fibrous adhesion in the deep gluteal space: proposed clinical diagnostic criteria and therapy using Manual Adhesion Release®. Journal of Musculoskeletal Disorders and Treatment. 2020;6:088. (link)
