1. Department of Orthopaedic Surgery, University of Natal, Private Bag 7, Congella, 4013 Durban, South Africa.
2. Department of Orthopaedic Surgery, Tygerberg Hospital, University of Stel-lenbosch, PO. Box 19063, Tygerberg 7505, South Africa.
3. 105 Panorama Medic-Clinic, Rothschild Boulevard, Panorama, Cape 7500, South Africa.
4. PO Box 586, Trichardt, 2300, South Africa.