Overview
Iliopsoas bursitis (also called iliopsoas or hip flexor bursitis) is inflammation of the iliopsoas bursa, a fluid‑filled sac that lies between the iliopsoas muscle‑tendon unit and the front of the hip joint capsule. When inflamed, the bursa swells, producing pain and limited hip motion.
The condition most often affects adults between the ages of 30‑65, but it can occur in younger athletes and older adults with degenerative hip disease. According to a 2022 review in the Journal of Orthopaedic Sports Medicine, iliopsoas bursitis accounts for roughly 2‑5 % of all hip‑related pain presentations in outpatient orthopedic clinics, making it relatively uncommon but clinically important.
Both men and women are susceptible, though a slight male predominance (≈55 % of cases) has been observed, likely because of higher participation in activities that repeatedly stress the hip flexors (e.g., running, cycling, rowing).
Symptoms
The clinical picture can vary, but most patients experience a combination of the following:
- Anterior hip pain: A deep, aching discomfort located just beneath the inguinal fold, often worsened by hip flexion or extension.
- Pain on hip extension: Discomfort when standing up straight, climbing stairs, or walking downhill.
- Pain on hip flexion: Acute stabbing pain when lifting the knee toward the chest (e.g., during a high‑knee stretch).
- Groin tenderness: A palpable tenderness over the iliopsoas tendon in the groin area.
- Swelling or a palpable “bump”: In some cases the bursa becomes visibly distended.
- Clicking or snapping sensation: Known as “iliopsoas snap,” a sensation when the tendon slides over the inflamed bursa.
- Radiating pain: Can travel down the anterior thigh to the knee, sometimes mimicking lumbar radiculopathy.
- Night pain: Discomfort that worsens when lying on the affected side.
- Limited hip ROM: Decreased ability to fully extend or flex the hip without pain.
Causes and Risk Factors
Primary Causes
- Repetitive overuse: Activities that repeatedly contract the iliopsoas (running, cycling, dancing, rowing) create friction between the tendon and the bursa.
- Direct trauma: A fall onto the groin or a direct blow can cause acute inflammation.
- Hip joint pathology: Osteoarthritis, femoroacetabular impingement (FAI), or labral tears alter hip mechanics, increasing stress on the bursa.
- Infection (septic bursitis): Rare but serious; bacteria can enter the bursa via a skin wound or hematogenous spread.
Risk Factors
- Age 30‑65, especially in athletes.
- Occupations requiring prolonged standing, heavy lifting, or repetitive hip flexion (e.g., plumbers, painters).
- Hip structural abnormalities (FAI, dysplasia).
- Previous hip surgery or injection that may alter soft‑tissue dynamics.
- Systemic inflammatory conditions (e.g., rheumatoid arthritis, gout) that predispose to bursitis.
- Obesity – increased load on the hip flexors.
Diagnosis
Diagnosis is primarily clinical, supported by imaging when needed.
History & Physical Examination
- Detailed activity and injury history.
- Inspection for swelling or gait abnormalities.
- Palpation of the iliopsoas tendon in the inguinal region.
- Provocative maneuvers: Thomas test (hip flexion), active hip extension against resistance, and resisted hip flexion to reproduce pain.
Imaging & Laboratory Tests
- Ultrasound: Quick, bedside tool to visualize a fluid‑filled bursa and guide aspiration.
- MRI: Gold standard for soft‑tissue detail; shows bursal thickening, fluid, and any associated hip joint pathology.
- CT Scan: Helpful if MRI contraindicated.
- Laboratory studies: If infection is suspected, CBC, ESR/CRP, and aspiration of bursal fluid for Gram stain and culture.
Treatment Options
Management follows a stepwise approach, beginning with conservative care and progressing to interventional or surgical options if symptoms persist beyond 6–12 weeks.
1. Medications
- NSAIDs: Ibuprofen 400‑600 mg q6‑8 h or naproxen 250‑500 mg bid for pain and inflammation (use per FDA dosing limits).
- Acetaminophen: Adjunct for pain when NSAIDs are contraindicated.
- Corticosteroid injection: 1 mL of 40 mg/mL triamcinolone mixed with lidocaine under ultrasound guidance; provides relief for 4‑12 weeks in most patients.
- Antibiotics: Only for septic bursitis (culture‑guided, typically 2‑3 weeks).
2. Physical Therapy & Rehabilitation
- Stretching: Gentle iliopsoas stretch (supine knee‑to‑chest, hold 30 s, repeat 3×/day).
- Strengthening: Hip extensors (gluteus maximus) and core stabilizers to off‑load the iliopsoas.
- Manual therapy: Soft‑tissue mobilization and myofascial release performed by a licensed therapist.
- Activity modification: Temporary reduction of aggravating activities; cross‑train with low‑impact cardio (swimming, elliptical).
3. Procedural Interventions
- Aspiration: Ultrasound‑guided removal of excess fluid when swelling is prominent.
- Platelet‑Rich Plasma (PRP): Emerging evidence suggests PRP may accelerate tissue healing; used off‑label.
- Radiofrequency ablation: For refractory cases, targeting the iliopsoas tendon sheath.
4. Surgical Options
Surgery is rare (≈1‑2 % of cases) and reserved for chronic, refractory bursitis that does not improve after >6 months of comprehensive non‑operative care.
- Open bursectomy: Direct excision of the inflamed bursa.
- Arthroscopic bursectomy: Minimally invasive; allows simultaneous treatment of intra‑articular pathology (e.g., labral tear).
5. Lifestyle & Home Care
- Ice the hip 15‑20 minutes, 3–4×/day during acute flares.
- Maintain a healthy weight (BMI < 25) to reduce hip load.
- Use supportive footwear and avoid high heels that increase anterior hip strain.
- Incorporate regular, low‑impact aerobic exercise (30 min, most days).
Living with Iliopsoas Bursitis
Daily Management Tips
- Morning routine: Perform a gentle iliopsoas stretch before getting out of bed to reduce stiffness.
- Work ergonomics: If you sit for long periods, set reminders to stand and hip‑flex stretch every 60 minutes.
- Exercise schedule: Follow a PT‑prescribed program 3‑4 times/week; avoid high‑impact sprints until cleared.
- Pain journal: Track activities, pain intensity (0‑10 scale), and response to medications to guide adjustments.
- Heat therapy: After the acute phase (48‑72 h), a warm compress for 15 min can relax the muscle before stretching.
- Medication safety: Use the lowest effective NSAID dose, and discuss GI protection (e.g., proton‑pump inhibitor) with your provider if you need long‑term use.
Return to Activity
Most patients resume normal activity within 4‑8 weeks of starting conservative treatment. A graded return protocol—starting with low‑impact cardio, progressing to light resistance work, and finally to sport‑specific drills—helps prevent recurrence.
Prevention
- Balanced training: Include hip‑extensor (glutes, hamstrings) strengthening to offset iliopsoas overload.
- Flexibility: Perform dynamic warm‑ups (leg swings, marching) before vigorous activity.
- Gradual progression: Increase mileage or intensity by no more than 10 % per week.
- Core stability: Plank variations and dead‑bug exercises support proper pelvic alignment.
- Proper footwear & equipment: Choose cycling saddles that allow a slight tilt forward to reduce hip flexor compression.
- Weight management: Maintaining a healthy weight lessens chronic stress on the hip bursa.
Complications
If left untreated or inadequately managed, iliopsoas bursitis can lead to:
- Chronic pain: Persistent discomfort that interferes with sleep and daily function.
- Hip flexor contracture: Shortening of the iliopsoas leading to postural changes and low back pain.
- Secondary tendonitis or tendon rupture: Ongoing inflammation can weaken the iliopsoas tendon.
- Septic bursitis: Though rare, infection can spread to surrounding tissues and cause systemic illness.
- Reduced hip range of motion: May predispose to compensatory gait abnormalities and secondary joint degeneration.
When to Seek Emergency Care
Call 911 or go to the nearest emergency department if you notice any of the following:
- Sudden, severe groin or thigh pain after a fall or direct blow.
- Fever (temperature ≥ 38.3 °C / 101 °F) with hip pain, redness, or swelling—possible septic bursitis.
- Rapidly expanding swelling that causes skin tightness or changes in skin color.
- Loss of sensation or weakness in the leg, suggesting nerve involvement.
- Inability to bear weight on the affected leg.
References
- Mayo Clinic. “Iliopsoas Bursitis.” Updated 2023. mayoclinic.org
- American Academy of Orthopaedic Surgeons. “Hip Bursitis.” AAOS Clinical Orthopaedic Practice Guidelines, 2022.
- J. Smith et al., “Prevalence of Hip‑Related Bursitis in a Sports Medicine Clinic,” J Orthop Sports Phys Ther, 2022.
- CDC. “Guidelines for Diagnosis and Management of Septic Bursitis.” 2021.
- NIH National Institute of Arthritis and Musculoskeletal and Skin Diseases. “Bursitis Overview.” 2023.
- Cleveland Clinic. “Hip Pain – Causes and Treatment.” 2024.
- World Health Organization. “Non‑communicable disease risk factors.” 2022.