When there is damage to one of the structures that surround the knee joint, this can lead to discomfort and disability. At its lower end, the femur divides into two rounded knobs called condyles that support the body's weight on the bone of the lower leg, the tibia. Additionally, braces, knee supports or shoe inserts may be used to protect the knee from stress. The knee joint involves four bones. Osteoarthritis (OA) of the knee affects the bones, the cartilage, and the synovium in the knee joint. The bones … There are two main joints in the knee: 1) the tibiofemoral joint where the tibia meet the femur 2) the patellofemoral joint where the kneecap (or patella) meets the femur. At its top, it helps create the ball-and-socket joint of the hip; its lower end helps create the knee joint. The hamstring tendons.There are three hamstring tendons that cross the knee joint on the back of the knee. Some of the more common knee injuries include: ACL injury. When you experience bone on bone knee pain, generally the knees lack the synovial fluid needed to allow the joints to glide smoothly over each other, therefore a bone on bone knee pain injection is administered. Two are on the inside (medial) part of the knee attaching to the shin bone (Semimembranosus and Semitendinosus) and one is on the outside (lateral) part of the knee, attaching to the fibula (Biceps femoris). The knee is a complex joint that flexes, extends, and twists slightly from side to side. While femur (thigh bone), tibia (shin bone) and patella (knee cap) are the bones that make up the complex knee joint, ligaments, cartilage and tendons help in keeping this joint stable. When the knee is straight, the condyles roll over and these structures are concealed. The femur, or thighbone, makes up the top portion of the joint. The knee joint is the junction of three bones: the thighbone, or femur; the shin bone, or tibia, the larger front bone of your calf; the kneecap, or patella. The knee joint is a complex joint that consists of bones, ligaments, cartilage and various other structures. A knee injury can affect any of the ligaments, tendons or fluid-filled sacs (bursae) that surround your knee joint as well as the bones, cartilage and ligaments that form the joint itself. The four main ligaments in the knee connect the femur (thighbone) to the tibia (shin bone), and include the following: Anterior cruciate ligament (ACL) - The ligament, located in the center of the knee, that controls rotation and forward movement of the tibia (shin bone). Stage 3 or Moderate: In this stage, there is obvious erosion of the cartilage surface between the bones and fibrillation narrows the gap between the bones. 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