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Baker's cyst

A Baker’s cyst is an accumulation of fluid in the back (posterior) aspect of your knee. It denotes that something is wrong inside the joint, which is causing the production of the fluid. Often a Baker’s cyst is associated with a tear or injury to the meniscus, the cushion cartilage in the knee. It is important to find the cause of the swelling because swelling has what we call degradative enzymes in it--components that break down cartilage and tissue in the joint. Chronic swelling of the joint is not good for the joint surfaces; therefore, careful diagnosis and a treatment plan should be started. Physical therapy such as Ice, soft tissue massage, anti-inflammatory, compression are good first steps for symptom relief. Aspiration of the cyst with a cortisone injection is sometimes helpful. Surgical repair of the underlying problem usually cures the cyst.
The Z-Lig™ ACLR Device, invented by Kevin R. Stone, M.D. and subsequently developed by Aperion Biologics, has been cleared for marketing and distribution in the European Union and other markets which recognize the CE Mark.
Metal has been used in patients since the time of Hippocrates (400 BCE) to repair broken bones and replace missing parts. The earliest metals included copper, tin or lead and often did not have the strength to last forever. Over the years, the metals we use have improved. They have become stronger and leach fewer ions into the body.
 Segmental Meniscal Defects
The meniscus can be compared to a gasket in a hose: If it is cut, water leaks out.
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Kevin R. Stone · Jonathan R. Pelsis · Scott T. Surrette · Ann W. Walgenbach · Thomas J. Turek 

Stone, K.R., A.W. Walgenbach, A. Freyer, T.J. Turek, and D.P. Speer. 2006.

Stone, K.R., Pelsis J.R., Adelson W.S., Walgenbach, A.W. 2010.