Knee pain persisting for more than 6 weeks, or associated with difficulty in stair climbing or squatting/ cross leg sitting, may be due to Knee Arthritis.
Knee Arthritis may develop secondary to degenerative process (OsteoArthritis) or chronic inflammatory changes (Rheumatoid Arthritis); less commonly it may be due to Uric Acid crystal deposition (UrateArthropathy); or sometimes after an injury or fracture around the joint (Post Traumatic Arthritis)
Arthritis develops secondary to loss of articular cartilage in the knee joint. There are three compartments, which may be affected in isolation, or together. Medial compartment arthritis is common in degenerative pathology. Lateral compartment arthritis is common in Rheumatoid patients. Patellofemoral arthritis leads to predominant pain in the front of the knee joint, and may be co-existent with medial or lateral compartment involvement.
Knee Arthritis in early stages typically presents with difficulty in squatting/ cross leg sitting or difficulty in climbing stairs. Gradually over a period of months, these changes become more profound causing restriction in activities of daily living. Pain is often associated with swelling and stiffness.
As Knee Arthritis progresses, patients notice gradual bowing of legs or difficulty in moving knee joint through the full range.