Osteoarthritis is a degenerative joint disease characterized by loss of articular cartilage and alterations to the underlying subchondral bone. There is evidence of hereditary defects that may predispose to osteoarthritis, yet other factors such as age, excessive joint loading, and joint injury increase the risk for development of this disease. The current study uses an in vivo post-traumatic animal model to investigate blunt impacts on the patello-femoral joint. Treatment options for the relief of pain due to chronic joint disease are currently limited. In Chapter 1 the role of two nutraceuticals, glucosamine and chondroitin sulfate, taken before and after a 6.0 joule blunt impact to the patello-femoral joint are examined in a regularly exercising animal model. Regular exercise has been shown to have beneficial effects on preserving articular cartilage in the knee after a blunt force trauma. Chapter 1 documented that pro-trauma exercise may play a role in strengthening the cartilage to protect it from severe trauma due to a blunt impact. Chapter 2 investigates the effects of mechanically stressing cartilage, with intermittent cyclic compressive loading of chondral explants. This regular loading tends to increase the mechanical properties of the cartilage. Finally, this investigation of stressed tissue, or “exercise” versus “no-exercise” is further examined with use of an animal model in Chapter 3. In this chapter chronic joint degeneration is accelerated in an animal model by increasing the amount of impact energy to the patello-femoral joint to 10.0 joules.