M12.271

Clinical Causes: The exact cause of pigmented villonodular synovitis is unknown. Some theories suggest an abnormal response to joint trauma or injury. Genetic factors may play a role in the development of PVNS. Chronic inflammation or immune system-related responses might contribute. In rare cases, it may be associated with other joint disorders or abnormalities.

Key Symptoms: Persistent joint swelling around the ankle and foot. Pain that worsens with activity or if the joint is moved or touched. Reduced range of motion, stiffness, or difficulty walking. A feeling of joint catching or locking during movement. Possible warmth and tenderness over the affected area. In some cases, symptoms may develop gradually over months or years.

Diagnosis Path: Physical examination of the ankle and foot to assess swelling, tenderness, and movement limitations. Imaging studies such as MRI scans, which are particularly effective at visualizing the characteristic pigmented and proliferative tissue. X-rays may be used to rule out other joint issues or bone abnormalities, though they are less specific for PVNS. Synovial biopsy, involving tissue sampling, can confirm the diagnosis by identifying pigmented, multinucleated giant cells and synovial proliferation characteristic of PVNS.

Treatment Protocols: Surgical removal of the affected synovial tissue, known as synovectomy, is the primary treatment. Minimally invasive arthroscopic surgery may be performed to excise the abnormal tissue. In some cases, open surgery might be necessary if the growth is extensive. Radiation therapy can be considered in cases where complete removal is not possible or if the disease recurs. Postoperative physiotherapy helps restore joint function and mobility. Regular follow-up is essential to monitor for potential recurrence, which can happen in some cases. Medications that suppress inflammatory responses are generally not effective for PVNS, but experimental or adjunct therapies may be explored in research settings.