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 biggest dam in South Africa is the Gariep Dam, previously known as the Hendrik Verwoerd Dam. When full, it contains nearly 6000 million cubic metres of water spread over m â¦ ore than 370 square kilometres. The dam was completed in 1971. The deepest lake in Africa (Tanzania, Zaire & Zambia) is Tanganyika. With a depth of 4,708 ft (1,435 m).