Osteoarthritis

Osteoarthritis – A disease in which the cartilage that cushions
the ends of the bones is lost, leading to joint pain and
stiffness. The most common form of arthritis, osteoarthritis
grows more common with age.

Osgood-Schlatter disease

Osgood-Schlatter disease – A disease often caused by repetitive
stress or tension on part of the growth area of the upper
tibia (the apophysis). It is characterized by inflammation of
the patellar tendon and surrounding soft tissues at the point
where the tendon attaches to the tibia. The disease may also
be associated with an injury in which the tendon is stretched
so much that it tears away from the synovium.