Hip Bone Marrow Edema: Causes, Diagnosis and Physiotherapy Treatment

For a complete overview, see our comprehensive bone marrow edema guide.

What is hip bone marrow edema?

Hip bone marrow edema is a condition where excess fluid accumulates within the spongy (cancellous) bone of the hip joint. It most commonly affects the femoral head and femoral neck, though it can also involve the acetabulum.

This condition occurs more frequently in men aged 30-60, though it can affect anyone. A specific form called transient osteoporosis of the hip (also known as bone marrow edema syndrome) typically affects middle-aged men and women in the third trimester of pregnancy. Studies in athletic populations report incidence rates up to 25% in individuals with non-traumatic hip pain (Korompilias et al., 2009).

Understanding what causes hip bone marrow edema and how to manage it effectively can help you work with your healthcare team to achieve the best possible outcome.

Causes and risk factors

Hip bone marrow edema can result from several overlapping causes:

Mechanical causes

• Overuse injuries: high-impact sports (distance running, jumping), sudden increases in training volume or intensity
• Stress fractures: trabecular microfractures of the femoral neck, common in runners and military personnel
• Femoroacetabular impingement (FAI): cam or pincer morphology creating abnormal forces on the femoral head

Vascular causes

• Early avascular necrosis (AVN): bone marrow edema may be the first sign of femoral head osteonecrosis
• Transient osteoporosis of the hip: a self-limiting condition more common in males (30-60 years) and during pregnancy
• Regional migratory osteoporosis: a rare variant where edema migrates between joints

Metabolic and medication-related causes

• Long-term corticosteroid therapy at high doses
• Excessive alcohol consumption
• Sickle cell disease and other haemoglobinopathies
• Systemic lupus erythematosus and other autoimmune conditions
• Vitamin D deficiency and calcium-phosphorus metabolism disorders

Key risk factors

• Age 30-60 years
• Male sex (M:F ratio 3:1 for transient osteoporosis)
• High-impact sports participation
• Being overweight (increased joint loading)
• Smoking (impairs bone microcirculation)

Symptoms and clinical signs

If you have hip bone marrow edema, you may experience:

• Deep groin pain: the most common symptom, felt at the front of the hip and sometimes radiating to the thigh or knee
• Weight-bearing pain: worse with standing and walking, improving with rest
• Limping: an altered walking pattern to reduce load on the affected leg
• Joint stiffness: reduced range of motion, particularly internal rotation and flexion
• Night pain: present in more severe cases, disrupting sleep

During a physical examination, your physiotherapist or doctor may find restricted internal rotation, a positive axial compression test, and a positive FABER test (Flexion, Abduction, External Rotation).

Diagnosis

MRI (gold standard)

MRI is the most reliable imaging tool for diagnosing hip bone marrow edema. It appears as a bright (hyperintense) area on T2-weighted fat-suppressed (STIR) sequences and dark (hypointense) on T1-weighted sequences. The location and pattern of edema help differentiate between conditions:

• Transient osteoporosis: diffuse edema throughout the femoral head and neck, without a demarcation line
• Avascular necrosis: edema with a low-signal band (the “double line sign”)
• Stress fracture: a dark line within the edema on T1 sequences

X-rays

Standard X-rays may appear normal in the early stages. In transient osteoporosis, progressive demineralisation of the femoral head becomes visible 3-6 weeks after symptom onset.

Blood tests

Blood work helps rule out metabolic causes: vitamin D levels, calcium, phosphorus, ESR, CRP, and full blood count. In idiopathic forms, laboratory results are typically normal.

Conservative treatment and physiotherapy

Treatment for hip bone marrow edema follows a progressive, phase-based approach:

Phase 1 — Protection and offloading (weeks 0-6)

• Protected weight bearing with crutches (20-30% of body weight)
• Pain management: paracetamol, short-term NSAIDs, vitamin D and calcium supplementation if needed
• PEMF therapy: 50-75 Hz frequency, 4-8 hours daily, for at least 60 consecutive days (Massari et al., 2006)
• Ice therapy for pain control
• Isometric exercises to maintain muscle tone (gluteals, quadriceps)

Phase 2 — Progressive mobilisation (weeks 6-12)

• Gradual increase in weight bearing (50-75% of body weight)
• Hydrotherapy: pool-based exercises to reduce gravitational loading
• Active hip range-of-motion exercises: flexion, extension, abduction in supported positions
• Stationary cycling without resistance to maintain joint mobility
• Gentle stretching of hip muscles (iliopsoas, piriformis, adductors)

Phase 3 — Strengthening and functional recovery (weeks 12-24)

• Full weight bearing without aids
• Progressive strengthening: gluteus medius and maximus, quadriceps, core stability
• Closed kinetic chain exercises: partial squats, controlled lunges, step-ups
• Proprioception and balance training on unstable surfaces
• Gradual return to sport (where applicable)

Exercises for hip bone marrow edema

Phase 1 — Isometrics and gentle mobility (weeks 0-6)

1. Isometric gluteal squeeze: lying on your back with knees bent, squeeze your buttocks together for 5 seconds, then relax. 3 sets of 10 repetitions, twice daily
2. Isometric quadriceps set: lying with your leg straight, press the back of your knee into the bed. Hold for 5 seconds. 3 sets of 10 repetitions
3. Heel slide: lying on your back, slide your heel towards your buttock by bending your knee. 2 sets of 10 repetitions

Phase 2 — Mobilisation and light strengthening (weeks 6-12)

1. Side-lying hip abduction: lying on your unaffected side, raise the affected leg 30 cm keeping the knee straight. 3 sets of 12 repetitions
2. Glute bridge: lying on your back with knees bent, lift your hips until knees, hips, and shoulders are aligned. Hold 3 seconds at the top. 3 sets of 10 repetitions
3. Stationary cycling: no resistance, 15-20 minutes daily with the saddle high to reduce hip flexion angle

Phase 3 — Progressive strengthening (week 12 onwards)

1. Partial squat: lower to 45 degrees of knee flexion, rise slowly. 3 sets of 10 repetitions with a resistance band around the knees
2. Lateral step-up: using a 15-20 cm step, step up leading with the affected leg while controlling knee alignment. 3 sets of 8 each side
3. Controlled forward lunge: moderate step length, back knee hovering 10 cm above the floor. 3 sets of 8 each side

When to see a doctor

You should seek medical attention promptly if you experience:

• Persistent groin pain that does not improve after 2-3 weeks of rest
• Night pain that disrupts your sleep
• Inability to bear weight on the affected leg
• Fever with hip pain (to rule out infection)
• New hip pain while on long-term corticosteroids (risk of avascular necrosis)
• Pain that worsens despite 3 months of conservative treatment

Prevention

• Gradual training progression: do not increase volume or intensity by more than 10% per week
• Maintain adequate vitamin D levels: serum levels above 30 ng/mL; supplement if necessary
• Manage body weight: reducing excess weight decreases mechanical stress on the hip joint
• Regular strengthening: a consistent programme for gluteals and core muscles protects the hip joint
• Avoid hard surfaces: for running, choose trails or grass over tarmac where possible
• Appropriate footwear: shoes with adequate cushioning for your activity type
• Stop smoking: smoking impairs bone microcirculation and slows healing

Frequently asked questions

How long does hip bone marrow edema take to heal?

Recovery typically ranges from 3 to 12 months depending on the cause and severity. Overuse-related edema usually resolves within 3-6 months with protected weight bearing and physiotherapy, while avascular necrosis-related edema may require longer treatment.

Can you walk with bone marrow edema in the hip?

It depends on the severity. During the acute phase, partial weight bearing with crutches is usually recommended. Gradual return to full weight bearing follows as symptoms improve, guided by your physiotherapist and orthopaedic specialist.

What is the difference between bone marrow edema and avascular necrosis?

Bone marrow edema is fluid accumulation within the bone marrow, often reversible with conservative treatment. Avascular necrosis (AVN) involves bone tissue death due to disrupted blood supply and may lead to femoral head collapse if untreated. Early bone marrow edema can sometimes be a precursor to AVN.

Does PEMF therapy work for hip bone marrow edema?

Pulsed electromagnetic field (PEMF) therapy has shown promising results in accelerating bone marrow edema resolution. Protocols using 50-75 Hz frequency for 4-8 hours daily over at least 60 consecutive days have the strongest evidence in published research.

What exercises can you do with hip bone marrow edema?

During the acute phase: isometric gluteal and quadriceps exercises. In the subacute phase: gentle range-of-motion exercises, stationary cycling without resistance. During recovery: progressive strengthening with resistance bands, partial squats, and balance training.

Can hip bone marrow edema come back?

Yes, recurrence is possible, especially if risk factors are not addressed. Repeated overloading, prolonged corticosteroid use, and metabolic conditions like osteoporosis increase the risk of recurrence. A structured prevention programme is important.

Sources and scientific references

1. Vande Berg BC, Lecouvet FE, Koutaissoff S, Simoni P, Malghem J. “Bone marrow edema of the femoral head and transient osteoporosis of the hip.” European Journal of Radiology. 2008;67(1):68-77. PubMed
2. Korompilias AV, Karantanas AH, Lykissas MG, Beris AE. “Bone marrow edema syndrome.” Skeletal Radiology. 2009;38(5):425-436. PubMed
3. Massari L, Fini M, Cadossi R, Setti S, Traina GC. “Biophysical stimulation with pulsed electromagnetic fields in osteonecrosis of the femoral head.” Journal of Bone and Joint Surgery. 2006;88-A(Suppl 3):56-60. PubMed
4. NICE Guidelines. “Osteoarthritis: care and management.” Clinical guideline CG177. National Institute for Health and Care Excellence. 2022. NICE
5. Karantanas AH. “Acute bone marrow edema of the hip: role of MR imaging.” European Radiology. 2007;17(9):2225-2236. PubMed