Three main problems that can cause a luxating patella. 1  The first abnormality that is usually present is a trochlear groove that is too shallow. In order for the patella not to jump out of this tract, the groove must be deep enough to accommodate and cradle the patella as it moves up and down in the groove.
The longest river in South Africa is the Orange River which starts off life in the Drakensberg Mountains and works its way westwards to Alexander Bay and then onto the west coast of South Africa.
Flowing through south-central Africa in an S-shaped course toward the Indian Ocean is the Zambezi River. It is 2,200 miles (3,540 kilometers) long, and its basin drains the entire south-central region of the continent-500,000 square miles (1,295,000 square kilometers).