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The knee is a common site of pain in athletes because of the tremendous forces that it must endure. There are various parts to a knee such the tendon, bursa, and meniscus. Injury to these knee joint structures can cause pain.

This detailed 3D animation provides a step-by-step explanation of how a hip replacement is performed. It shows each step from initial incision, through leg alignment and adjustment, to final suture closure.

As the title implies, this video describes how muscles work. It shows the anatomy of the muscle in relation to bone but also the structure of muscle at the microscopic level.

This video contains an artist's representation of what bone looks like at the microscopic level. While many think that bone is simply a solid piece of calcium, it is actually a living, changing tissue with blood vessels and various small areas of open space.

There are several bones in the wrist joint and trauma to this area can cause one of a number of wrist and arm fractures. One of the most common types of wrist fracture, called a Colles fracture, is discussed as well one way to treat the fracture.

This animated video not only shows a knee arthroscopy from start to finish, but gives a representation of what the surgeon sees through the tiny camera during arthroscopy. It also provides a view of the anatomy of the knee joint and how it works and moves.

A journalistic report on a woman's experience with carpal tunnel syndrome and how she found relief with a new endoscopic carpal tunnel release surgery.

This video shows an animation of the normal anatomy of bone and what occurs to bone that is affected by osteoporosis. It also explains why osteoporosis is more likely in to occur in women and as we age.

Athletes commonly tear or rupture the anterior cruciate ligament in the knee and require surgery to repair it. The narrator is this 3D animation explains how the patellar tendon is used to reconstruct the ACL.

Dental implants have revolutionized the way that dentists replace teeth, but they do require healthy jaw bone in which to anchor. Unfortunately tooth loss causes bone to resorb (atrophy or deteriorate). This video describes the process by which new bone if grafted into the jaw so that dental implants can be installed.

The Achilles tendon is the major tendon that connects the lower leg to the foot. Without your Achilles tendon, you would not be able to point your foot or walk effectively. This narrated animation describes how tears in the Achilles tendon are repaired surgically.

This animation explains the meniscus of the knee, why it is important for knee function and what symptoms occur when it is diseased.

Knee joints or finger joints are fairly easy to understand--they facilitate back and forth movement; however, anywhere that two bones meet in the body there is some sort of joint. This animation describes the different joints in the body and what anatomical structures make up joints.

The hip is responsible for a broad range of movement despite being subjected to tremendous forces. Sports can cause a number of hip disorders such as bursitis and overuse injuries. A physician for LPGA golfers explains various sports-related hip injuries.

Rheumatoid arthritis is an autoimmune disease that can attack parts of the joint, in most joints in the body. This narrated animation describes how the joint works, how the immune system can erroneously attack joints in RA, and describes some of the treatment options for rheumatoid arthritis.

This 3D animation shows the procedure involved for hip replacement surgery. It is not narrated, but the relevant anatomy is labeled.

This animation shows the steps involved in an anterior cervical disc replacement. The cervical spine is the spinal area that supports the head while the disks of the spine are the relatively soft areas between individual vertebra (spinal bones). As the animation shows, this cervical disc replacement involves the removal of the natural, diseased cervical disk and the replacement with an artifical joint.

Originally published as a patient activity, this animation describes the step-by-step process involved in knee replacement surgery. It shows many of the considerations that orthopedic surgeons face with an artifical knee surgery.

This animation shows the function of the main skeletal muscles in the body. At the microscopic level, artists have animated how actin and myosin, (two muscle proteins) interact to make muscles contract.

This narrated 3D animation shows the anatomy of the knee joint and how a knee replacement (artificial knee placement) takes place. The movement of the artificial joint is shown.

Breaking a bone is not like breaking a dinner plate, there are a number of arteries and cells that are disrupted. This narration explains what occurs during a bone fracture and how the bone heals and repairs itself.

A physician describes what takes place during rheumatoid arthritis and explains how RA is an autoimmune disease in this video. In rheumatoid arthritis, the immune system acts inappropriately and attacks the structures inside of joints. This immune system attack leads to the characteristic RA symptoms of pain, inflammation, joint stiffness and joint deformity (destruction).

This video describes the two types of osteoporosis, the symptoms that it may cause, the tests used to diagnose osteoporosis, and some treatment options. Note the estrogen replacement therapy mentioned in the video may not be appropriate for most patients.