![]() Repeated injuries to the knee joint, tissue or muscles causing the joint to bleed internally.Untreated arthritis, particularly gout or Rheumatoid Arthritis.Causes of joint bleeds and inflammation in the knee include: This increase in blood vessels around the injured joint is one reason why the knee will begin to swell with inflammation. When internal bleeding is present in the joint, the synovial membrane thickens and will grow additional blood vessels in the area, which may lead to even more bleeding in the joint if left untreated. Repeated, untreated, internal joint bleeding of the knee has the possibility of leaking into the synovium. Inflammation in the knee or any other synovial joint is due to an overproduction of synovial fluid or bleeding in the joint in reaction to a trauma of the joint. Synovitis is ultimately caused by inflammation, and the root cause of this inflammation needs to be determined. The underlying synovitis knee causes can be very benign or more severe. Other joints within the body can also suffer from synovitis. Usually the knees will puff up with swelling and cause joint pain, decreased motion, lack of smooth motion, warmth, or may show a reddish or pink hue. Synovitis is swelling of this internal knee structure to any degree caused by the joint overproducing synovial fluid. ![]() Synovitis is a chronic knee pain condition that involves inflammation or irritation within the synovium. The suffix ‘itis’ means ‘inflammation of’. The synovial fluid also plays a role in nourishment of any joint that it surrounds. The synovium is a membranous lining of the joint that contains a viscous fluid (synovial fluid), that helps to lubricate the joint lending to smooth motion. The capsule is composed of a tougher, outer fibrous layer and an inner, softer layer called the synovium. Thich is a balloon-like structure that encases the entire joint. The knee joint is surrounded by a joint capsule. Gout or pseudogout, the most common forms of "crystal-induced" arthritis, can be proven by seeing the appropriate crystal (uric acid crystals in gout calcium crystals in pseudogout).The knee is what is known as a synovial joint. Many common bacterial joint infections can be identified by analysis of the fluid. High white blood cell count in joint fluid suggests the presence of marked inflammation (making infection a larger concern).Ī large number of red blood cells suggests there's been bleeding into the joint. This is helpful because certain diseases can be suggested or even proven by the results of this analysis: Your doctor may recommend a procedure (called arthrocentesis, or joint aspiration) in which a sample of fluid is removed from the knee and analyzed for the presence of white blood cells, red blood cells, infection, or crystals. This is sometimes called "water on the knee." In addition to arthritis, structural problems in the knee (such as torn cartilage or ligament injury) may stimulate extra fluid formation. When there is any type of arthritis present, fluid may accumulate in the joint. Normally, there is a tiny amount of fluid in the knee which serves as a lubricant and to deliver nutrition to the cartilage that lines the joint. There are other, rarer, causes that will not be covered here. Swelling near the knee joint (without an actual joint problem)-for example, bursitis can cause swelling directly on top of the kneecapįluid behind the knee, called a Baker's cyst.Įach of these will be briefly reviewed. In general, one or both knees may be swollen due toĮnlargement of the bones near the knee joint Would you like to get information related to your own situation? Or would you rather start with some general information about knee swelling? You'll be asked a series of questions and depending on your answers, information will be provided and additional questions asked until the conclusion. This decision guide will focus on persistent knee swelling - that is, knee swelling lasting more than two or three weeks. Ligament tears, cartilage damage and fracture can follow trauma and may require urgent treatment this is particularly true if you are unable to bear weight. If you have new, unexplained knee swelling that followed a significant injury or you have fever, this guide is not the best place to start! See your doctor first. Knee swelling may develop for a number of reasons. ![]() Please keep in mind that this guide is not intended to replace a face-to-face evaluation with your doctor.įirst, some background information about this guide and about knee swelling: The goal of this guide is to provide information while awaiting evaluation with your doctor for persistent knee swelling or for additional information after you have seen him or her. We're sorry to hear you have this problem! Welcome to this Decision Guide about persistent knee swelling.
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