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.
Nile River. The Nile River of Africa is the longest river in the world, covering a distance of more than 4,000 miles. Beginning near the equator, the river flows northward through northeastern Africa and passes through Egypt before emptying into the Mediterranean Sea. The Nile River was extremely important to ancient Egypt.