Awareness of these relations will facilitate more rational therapeutic approaches in chronic arthritis. Furthermore, increasing Pia caused by joint effusion inhibits knee extensor muscle function and impairs synovial blood flow. We conclude that the V50 is a convenient expression of capsular stiffness. In a few instances evidence of intraarticular compartmentalization was found at low volumes. The reproducibility was good for all variables studied. Increased intraarticular hydrostatic pressure Pia levels between 2 mm Hg were observed during maximal voluntary activation of extensor muscles. This leads to swelling (an effusion) and a tightness sensation within the joint. The synovial lining of the knee often produces excess amounts of fluid in response to inflammation or direct injury. No difference in inhibition was found for the 2 portions of quadriceps muscle tested. This complex fluid plays an essential role in lubricating the joint and provides nourishment to the cartilage surfaces covering the bone. Progressive inhibition of extensor torque and EMG was found as the intraarticular pressure volume was increased in both intact and destroyed joints. In 5 of these, quantified electromyography (EMG) of the vastus medialis and lateralis portion of the quadriceps muscle was also monitored. Intraarticular hydrostatic pressure and maximal voluntary isometric extensor torque were measured simultaneously, while altering the intraarticular fluid volume in 9 knee joints. ![]() ![]() After normalization of injected volumes according to the V50, pressure volume curves became similar. Since capsular elastance was difficult to standardize, we introduce a measure of joint capsular stiffness where the intraarticular volume yielding a pressure of 50 mm Hg (V50) is used. Seventeen knee joints with effusive arthritis and different degrees of radiological cartilage involvement in 13 patients with chronic arthritis were examined. Joint capsular stiffness together with synovial fluid volume determines Pia at rest. Rheumatoid arthritis: Rheumatoid arthritis (RA) is an autoimmune condition that also breaks down your cartilage.Increased intraarticular hydrostatic pressure (Pia) may inhibit juxtaarticular muscle function, obstruct blood supply to joint structures and promote anoxic joint destruction in chronic arthritis.Osteoarthritis: Osteoarthritis is a degenerative disease that damages cartilage, causing the bones in your joints to grind together.Knee contusion: A knee contusion is a bruise that results from a direct blow to your knee.Ĭertain underlying conditions can also cause pain in this area:.Its injury and inflammation can cause plica syndrome. Plica syndrome: The plica is a fold in the membrane surrounding your knee joint.Pes anserine bursitis: This is an inflammation of the bursa located between the shinbone and three tendons of the hamstring at the inside of the knee.A meniscus tear happens if your knee is rotated or put under excessive pressure. Meniscus injury: The meniscus is cartilage that provides a cushion between bones in a joint.An MCL sprain or tear happens if it becomes overstretched. Medial collateral ligament (MCL) injury: The MCL runs along the outside of your inner knee to stabilize the joint.Common conditions related to inner knee pain are: Inner knee pain is typically caused by cartilage deterioration due to injuries. Patellofemoral osteoarthritis: This type of arthritis affects the underside of the patella and the groove in the femur in which the patella sits.Patella stress fracture: This is a hairline break, which remains in place, of the patella. ![]() ![]()
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