The most common type of knee arthritis is osteoarthritis (osteoarthritis of the knees is often associated with a history of repeated injury and/or joint surgery).
Rheumatoid Arthritis generally affects both knees.
Post-traumatic arthritis can develop after an injury to the knee, is similar to osteoarthritis and may develop years after a fracture, ligament injury, or meniscus tear.
Do you usually get worse joint pain later in the day?