Directory Upper and Lower Limb Orthotic and Prosthetic Devices Listings There are 1 Listings in this Category. Adrian Singh - Medical Orthotist and Prosthetist 250 Cedar Avenue, Chartwell, Fourways, Gauteng, South Africa, 2055 Manufacturer of upper and lower limb orthotic and prosthetic appliances. Stockists of walking aids, compression hosiery, knee bracing and other various mobility aids and supports. Supplier of diabetic footwear and custom made surgical footwear.