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.
The Congo River (in the past also known as the Zaire River) is a river in Africa, and is the deepest river in the world, with measured depths in excess of 220 m (720 ft).[2] It is the third largest river in the world by volume of water discharged.