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 Amazon River is the second longest river in the world (the Nile River in Africa is the longest) and is about 4,000 miles (6400 km) long. (In July 2007 a group of scientists reportedly determined that the Amazon River might just be the longest river in the world, taking that title from the Nile River.