painful knee joint. medically artwork concept

painful knee joint discomfort swelling inflammation arthritis injury stiffness osteoarthritis rheumatoid meniscus ligament cartilage instability mobility crepitus patella tenderness exercise physical therapy nsaids corticosteroids ice heat rest biomechanics orthopedics degeneration alignment weightbearing meniscal tear cruciate collateral patellar bursitis synovitis effusion rehabilitation strength flexibility proprioception proprioceptive neuromuscular brace support analgesics