Causes of synovial cyst of the wrist
A synovial cyst of the wrist is a benign swelling of unknown origin (idiopathic synovial cyst). This cyst is not a clinical sign of a hand or wrist disease, nor is it related to the possible presence of other cysts on the body. It results either from wear and tear of the joint capsule at the wrist (arthro-synovial cyst) or from degeneration of the synovial sheath that surrounds the wrist tendons (tenosynovial cyst). Trauma can be the cause (fall onto the hand, rupture of the wrist ligaments, wrist sprain, fracture, etc.). Furthermore, some people are more at risk than others of developing a synovial cyst of the wrist. This is the case if they have suffered trauma to the wrist, if they have osteoarthritis or suffer from an inflammatory disease (rheumatism, rheumatoid arthritis, etc.).
Symptoms and pain associated with a synovial cyst of the wrist
According to the French Institute of Hand Surgery, the first sign of a synovial cyst of the wrist is the gradual or sudden appearance of a fluid-filled swelling. This lump grows over several weeks, or even several months, before stabilizing. It can be soft or hard depending on the amount of synovial fluid it contains. Pain is not always present; it depends on the location of the synovial cyst. Pain is most common with cysts of traumatic origin and in certain positions (during wrist extension or flexion movements, or when pressing on the palm). In the case of a palmar synovial cyst, its location can cause painful compression, accompanied by paresthesia.
Treatments for a synovial cyst of the wrist
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