ligaments of the knee_tear of the posterior cruciate ligament

acl anatomy arthritis arthroplasty arthroscopy articular artritis bone cartilage chondromalacia collateral cruciate disease dislocation femur fibrocartilage fibula foot health human inflammation injury joint knee kneecap lateral leg ligament medial medicine meniscus orthopedics osteoarthritis osteoporosis pain patella pcl problem rehabilitation replacement rupture skeleton sport sprain surgery synovial tibia torn trauma treatment twist