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Morbus Ahlback: Causes, Symptoms & Treatment

Morbus Ahlback is a rare knee joint condition in which bone tissue in the femoral condyle dies due to impaired blood supply. It mainly affects older women.

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Things worth knowing about "Morbus Ahlback"

Morbus Ahlback is a rare knee joint condition in which bone tissue in the femoral condyle dies due to impaired blood supply. It mainly affects older women.

What is Morbus Ahlback?

Morbus Ahlback, also known as spontaneous osteonecrosis of the knee (SONK), is a rare but serious condition affecting the knee joint. It involves the death of bone tissue in the medial femoral condyle – the inner part of the thigh bone – due to a disrupted blood supply. This leads to progressive destruction of the articular cartilage and the underlying bone.

The condition was first described in 1968 by Swedish radiologist Sven Ahlback and has since borne his name. It primarily affects women over the age of 60 and often occurs without any obvious external trigger.

Causes

The exact cause of Morbus Ahlback has not yet been fully established. Several factors are under discussion:

Impaired blood supply: An interruption of blood flow to the bone is considered the primary cause of tissue death (osteonecrosis).
Insufficiency fractures: Small, stress-related microfractures can damage blood vessels within the bone and trigger osteonecrosis.
Risk factors: Osteoporosis, corticosteroid therapy, excessive alcohol consumption, and certain blood clotting disorders are regarded as contributing factors.
Age and sex: Postmenopausal women are particularly frequently affected, suggesting the involvement of hormonal and metabolic changes.

Symptoms

The symptoms of Morbus Ahlback often develop suddenly and can be quite severe:

Sudden onset of knee pain: Typically on the inner side of the knee, occurring without prior trauma.
Weight-bearing pain: Pain intensifies with walking, climbing stairs, or rising from a seated position.
Rest pain: In advanced stages, pain may also occur at rest, sometimes even at night.
Swelling and warmth: The affected knee joint may appear swollen and feel warm to the touch.
Restricted range of motion: The mobility of the knee joint may become progressively limited.

Diagnosis

Diagnosing Morbus Ahlback requires imaging studies, as symptoms alone are not conclusive:

Magnetic Resonance Imaging (MRI): MRI is the most sensitive method for early diagnosis and can detect bone changes before they appear on X-rays.
X-ray: In later stages, typical changes such as flattening of the femoral condyle or joint space narrowing may be visible on plain radiographs.
Bone scintigraphy: A bone scan can detect increased metabolic activity in the affected bone area.
Staging: The condition is typically classified according to the Ficat and Arlet system or the Koshino classification, which describe the extent and severity of the disease.

Treatment

Treatment depends on the stage of the disease and the individual symptoms of the patient:

Conservative Treatment

In early stages, a conservative treatment approach may be attempted:

Offloading: Reducing the load on the affected knee using crutches or walking aids.
Pain management: Non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or diclofenac can be used to relieve pain.
Physiotherapy: Targeted exercises to strengthen the knee muscles and improve joint mobility.
Orthotic devices: Specially designed knee braces can help redistribute the load away from the affected area.

Surgical Treatment

In advanced stages or when conservative treatment fails, surgical interventions may be considered:

Core decompression: Drilling into the necrotic bone aims to reduce pressure and stimulate blood supply.
High tibial osteotomy: A surgical realignment of the leg axis can shift the load from the damaged area to healthier tissue.
Total knee replacement (TKR): In severe cases with advanced joint destruction, a total knee arthroplasty may be necessary.

Prognosis

The prognosis of Morbus Ahlback depends largely on the stage at diagnosis. Early-stage cases with small necrotic lesions may recover with conservative treatment. Advanced stages frequently lead to progressive osteoarthritis of the knee, often requiring surgical intervention. Early diagnosis and timely treatment are therefore crucial for the course of the disease.

References

Ahlbäck S. - Osteoarthrosis of the knee. A radiographic investigation. Acta Radiologica Diagnosis, 1968.
Zanetti M., Romero J., Dambacher M.A., Hodler J. - Spontaneous osteonecrosis of the medial tibial plateau treated with core decompression. Archives of Orthopaedic and Trauma Surgery, 2000.
Mont M.A., Baumgarten K.M., Rifai A., et al. - Atraumatic osteonecrosis of the knee. Journal of Bone and Joint Surgery, 2000.

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