What is Deep Gluteal Syndrome?
Deep gluteal syndrome (DGS) is a complex and often under-recognized condition that originates from structures deep within the buttock rather than the more superficial gluteal muscles. Patients typically describe it as a deep, dull ache or sharp pain in the buttock, sometimes radiating down the back of the thigh.
Unlike typical low back or sciatic pain, deep gluteal pain is often aggravated by sitting for long periods, climbing stairs, or performing hip movements that require external rotation and abduction. It is frequently associated with compression or irritation of the sciatic nerve in the deep gluteal space.
Anatomy
Anatomically, the deep gluteal region lies beneath the gluteus maximus and is bounded by the pelvis, greater trochanter, and sacrum.
Key muscles in this area include the:
- Piriformis
- Obturator internus
- Gemellus superior and inferior
- Quadratus femoris.
These muscles collectively act to externally rotate and stabilise the hip during movement. The piriformis muscle is particularly significant because the sciatic nerve passes either beneath, through, or above it in most individuals, making it a common site of nerve entrapment.
In addition to the piriformis, the sciatic nerve itself is the main neural structure implicated in deep gluteal pain. Other nerves in the region, such as the superior gluteal nerve (innervating gluteus medius, minimus, and tensor fascia lata) and the inferior gluteal nerve (gluteus maximus), can also contribute to dysfunction if compressed or irritated.
Vascular structures like the inferior gluteal artery lie adjacent to these muscles and nerves, but are less commonly involved.
Case Overview
A 38-year-old recreational long-distance runner presented with persistent posterior hip and buttock pain, radiating into the posterior thigh, worsened by sitting and running. The case illustrates the importance of considering deep gluteal syndrome; a non-discogenic cause of sciatic nerve entrapment, particularly relevant for diagnosing and managing patients with sciatica-like symptoms but normal lumbar imaging.
Clinical History
The patient, a 38-year-old female marketing executive and half-marathon runner, reported an 8-month history of progressive right buttock pain radiating down the posterior thigh to the mid-calf.
- Onset: Gradual, initially after an increase in hill running volume.
- Aggravating factors: Prolonged sitting (>30 minutes), long runs, driving, and deep squats.
- Easing factors: Standing, short walks, lying supine.
- Pain severity: 7/10 at worst (NPRS).
- Red flag screen: No bowel/bladder disturbance, saddle anaesthesia, weight loss, fever, or night sweats.
- Prior treatment: Massage and lumbar physiotherapy offered temporary relief but symptoms recurred.
Exercise History
She trained 5–6 times per week, combining endurance running with strength classes. Despite reducing mileage, symptoms persisted. No significant previous hip or lumbar spine injuries were reported.
Clinical Examination
Observation & Gait Analysis
- Subtle right-sided pelvic drop during single-leg stance.
- Antalgic gait with shortened right stride length.
Range of Motion (ROM)
- Lumbar ROM: Full and pain-free.
- Hip flexion: 120° bilaterally.
- Internal rotation: Right limited to 20° (vs 35° left) with posterior buttock pain.
- External rotation: Symmetrical.
Neurological Screen
- Power: 5/5 throughout lower limb.
- Reflexes: Normal and symmetrical.
- Sensation: Subjective tingling posterior thigh, no dermatomal loss.
Provocative Tests
- FADIR test (hip Flexion, Adduction, Internal Rotation): Reproduced buttock and thigh pain.
- Active piriformis test: Positive on right (pain and reproduction of symptoms).
- Seated piriformis stretch: Positive on right.
- Pace Test (resisted abduction/external rotation in sitting): Pain reproduced.
- Freiberg and Beatty tests: Positive on right.
- Straight-leg raise: Limited to 55° with buttock pain (vs 80° left), slump test negative.
- Posterior hip impingement test: Negative.
- Ischiofemoral impingement manoeuvre: Mild posterior buttock discomfort but not concordant.
Palpation
- Local tenderness over greater sciatic notch and course of sciatic nerve.
- No focal ischial tuberosity tenderness.
In-Clinic Diagnostic Ultrasound
High-resolution ultrasound demonstrated normal gluteus medius/minimus tendons and proximal hamstring origin. Sciatic nerve visualised with mild hypoechogenicity and perineural oedema adjacent to piriformis tendon, suggesting local irritation. Dynamic scanning showed limited nerve excursion with hip rotation.
Investigations & Imaging
A pelvic MRI with neurography sequences was arranged:
- Findings: Hypertrophied piriformis muscle with sciatic nerve oedema signal (increased T2 hyperintensity) and mild narrowing of ischiofemoral space, though quadratus femoris normal.
- No lumbar disc herniation, hip labral pathology, or sacroiliac abnormality.
A STIR coronal image reveals oedema throughout the right piriformis muscle.
The coronal T1-weighted images demonstrate enlargement of the right piriformis muscle (arrow).
Source: https://radsource.us/piriformis-syndrome/
Differential Diagnosis & Clinical Reasoning
- Lumbar radiculopathy: Excluded by normal lumbar MRI, intact neurology.
- Proximal hamstring tendinopathy/bursitis: No focal ischial tenderness, ultrasound and MRI normal.
- Ischiofemoral impingement: Mild narrowing but no quadratus femoris oedema.
- Sacroiliac joint dysfunction: Tests negative, no inflammatory features.
- Hip intra-articular pathology: No labral tear, normal FADIR testing.
- Vascular causes (e.g., gluteal vein varix): No imaging evidence.
The combination of positive piriformis-provocation tests, imaging findings of piriformis hypertrophy with sciatic nerve oedema, and clinical correlation supported a diagnosis of deep gluteal syndrome (piriformis-related entrapment).
Management & Rehabilitation
Initial conservative management plan:
- Education & activity modification: Avoid prolonged sitting, use wedge cushion, limit hill running and deep squats.
- Physiotherapy:
- Neural mobilisation exercises (gentle sciatic nerve glides).
- Piriformis and hip external rotator stretches.
- Strengthening of hip abductors and core for pelvic stability.
- Progressive loading avoiding end-range flexion/adduction initially.
- Medication: Short course NSAIDs for analgesia.
Interventions:
- Ultrasound-guided injection of local anaesthetic and corticosteroid into piriformis sheath performed for diagnostic and therapeutic purposes. Immediate pain reduction confirmed diagnosis.
- Consideration for botulinum toxin injection if refractory.
Surgical referral:
Reserved for persistent, debilitating cases >6–12 months despite comprehensive conservative management and where imaging confirms entrapment.
Outcome & Follow-up
- 6 weeks: Significant symptom reduction (NPRS 7 → 3). Sitting tolerance improved to 60 minutes.
- 12 weeks: Completed progressive rehab programme, resumed light jogging without flare-up.
- 6 months: Returned to half-marathon training. LEFS score improved from 54/80 to 74/80. Mild discomfort occasionally after long drives but overall functional recovery.
Learning Points
- DGS is an important differential in posterior hip/buttock pain with sciatica-like features but normal spine imaging.
- Careful clinical testing (active piriformis + seated stretch) improves diagnostic accuracy.
- Ultrasound and MRI/MR neurography aid in confirming diagnosis and excluding mimics.
- Management is primarily conservative, integrating activity modification, physiotherapy, and injections where indicated.
- Physiotherapists play a central role in rehab progression, pelvic stability retraining, and safe return to sport.
- Maintain a high index of suspicion for DGS in athletes and sedentary workers with “sitting pain”.
References
- Martin HD, Reddy M, Gómez-Hoyos J. Deep gluteal syndrome. J Hip Preserv Surg. 2015;2(2):99-107. doi:10.1093/jhps/hnv029
- Hernando MF, Cerezal L, Pérez-Carro L, et al. Deep gluteal syndrome: anatomy, imaging, and management. Skeletal Radiol. 2015;44:919-934. doi:10.1007/s00256-015-2124-6
- 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(5):556-567. doi:10.1302/0301-620X.102B5.BJJ-2019-1212.R1
- Geler Külcü D. Deep gluteal syndrome: an underestimated cause of posterior hip pain. Turk J Phys Med Rehab. 2024;70(1):4-16. doi:10.5606/tftrd.2024.14668
- Gonzalez-Lomas G. Deep gluteal pain in orthopaedics: a challenging diagnosis. J Am Acad Orthop Surg. 2021;29(24):e1282-e1290. doi:10.5435/JAAOS-D-21-00707
