In the younger population, your knee meniscus is usually torn traumatically, by a twisting on a slightly flexed knee. The traumatic type of meniscal injuries are most often sports-related. The meniscus can be torn anterior to posterior, radially (parrot beak), or can have a bucket handle appearance.
Knee replacement surgery also known as knee arthroplasty is procedure to replace the weight-bearing surfaces of the knee joint to relieve the pain and disability of osteoarthritis. It may be performed for other knee diseases such as rheumatoid arthritis and psoriatic arthritis.