Knee conditions normally involve disease or injury that can disturb the normal functioning of the joint. This can result in knee pain, weakness, instability, and limited movement. With longer life expectancy and greater activity levels, joint replacement is being performed in greater numbers on patients thanks to new advances in artificial joint technology provided by the orthopedic surgeons at Peninsula Bone & Joint Clinic. This joint is formed by two or more bones that are connected by thick bands of tissue called ligaments. The knee is the largest joint in the body and is made up of three main parts: The lower end of the thigh bone, or femur. The upper end of the shin bone, or tibia. The kneecap, or patella. At some time in life, you may experience knee pain.