This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Orthopaedics
The action of intramedullary 'K' nail is - 
Select and explain. 
A. Two-point fixation, B. Three-point fixation, C. Compression, D. Weight concentration
B: Three-point fixation
Answer: B: Three-point fixation 
Explanation: K-nail is used for transverse or short oblique fracture of the femur, especially in the ischemic area.
K-nail (Kuntscher cloverleaf intramedullary nail) provides three points fixation due to elastic deformation.
These three points of fixation are both ends of bone (2 points) and isthmus (3rd point).