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.
It is the longest river of Africa as well as the longest river of the world. It flows in Ethiopia, Egypt, and Rwanda and in Sudan. This river is historically important which had given the birth of civilized nation of the world. The second longest river of Africa is The Congo which flows westward through Central Africa.