Pierrefonds Did you start experiencing posterior knee pain unexpectedly? There is NO such thing as unexpectedly! There is always a reason why pain surfaces. Chronic pains build up over long periods of time and they appear out of the blue when the body can no longer cope with the pain.
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They are posterior to the medial femoral condyle. The synovial sac of the knee joint can, under certain circumstances, produce a posterior bulge, into the popliteal space , the space behind the knee. When this bulge becomes large enough, it becomes palpable and cystic.
Diagnosis[ edit ] Diagnosis is by examination. It is most easily palpated felt with the knee partially flexed. Diagnosis is confirmed by ultrasonography , although if needed and there is no suspicion of a popliteal artery aneurysm then aspiration of synovial fluid from the cyst may be undertaken with care.
An infrequent but potentially life-threatening complication, which may need to be excluded by blood tests and ultrasonography, is a deep vein thrombosis DVT. A burst cyst commonly causes calf pain, swelling and redness that may mimic thrombophlebitis.
It is very rare that the symptoms are actually coming from the cyst. In most cases, there is another disorder in the knee arthritis, meniscal cartilage tear, etc. Initial treatment should be directed at correcting the source of the increased fluid production.
Often rest and leg elevation are all that is needed. If necessary, the cyst can be aspirated to reduce its size, then injected with a corticosteroid to reduce inflammation. Surgical excision is reserved for cysts that cause a great amount of discomfort to the patient. A ruptured cyst is treated with rest, leg elevation, and injection of a corticosteroid into the knee.
Avoiding activities such as squatting, kneeling, heavy lifting, climbing, and even running can help prevent pain.
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