Chronic Knee Pain
Chronic knee pain affects 27 million people in the United States and is a leading cause of disability. Seventy percent of the population 65 years or older will have knee pain with radiographic evidence of osteoarthritis, and 12% will have clinical symptoms of osteoarthritis. Chronic knee pain after total knee replacement ranges from 10% to 20%. Patellofemoral pain syndrome (PFPS) refers to anterior knee pain exacerbated with knee joint loading activities (squatting, kneeling, prolonged sitting, ascending/descending stairs). PFPS is a clinical diagnosis, and treatment is directed toward pain alleviation and restoration of proper biomechanics. Pes anserine syndrome is common in runners, athletes, and individuals with osteoarthritis of the knee. Other risk factors include: female sex and a history of diabetes mellitus, obesity, or arthritis. Knowledge of the common knee pain etiologies, as well as key clinical manifestations, physical exam findings, differential diagnosis, and treatment options for each is important for pain specialists.