This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy of Bone & Fracture Healing, Subject name: Orthopaedics
What about durham pin is true - 
Select and explain. 
A. It is used to give skeletal traction, B. It has threads in the center of pin, C. It is used to give skeletal traction through calcaneum, D. All the above
D: All the above
Answer: D: All the above 
Explanation: Ans. is 'd'i.e., All the above Denham pino It is a type of pin used to give skeletal traction.o Threaded portion of the pin engages the bony cortices and reduces the chances of pin sliding,o This type of pin is used commonly to give skeletal traction through the cancellous bone i.e. calcaneum. It can also be used to give traction through osteoporotic bones.