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.
There are parts of it called the Blue Nile and parts called the White Nile. By Caitlin McCarter The 4 Major Rivers in Africa It is over 2,720 miles long and is the deepest river in the world. It empties out into the Atlantic Ocean. Its the main river in western Africa. Its exactly 2,600 miles long.