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 longest river in the world is the Nile River, located in Africa. From its source in the country of Burundi to its mouth on the Mediterranean Sea, it extends for 4,145 mileâ¦s (6,670 kilometers). But the world's second longest river, the Amazon (4,007 miles, or 6,451 kilometers), which is located in South America, is really the world's biggest river.