What is the type of bone healing of a femoral neck fracture?

What is the type of bone healing of a femoral neck fracture?

As the femoral neck lacks a periosteal layer, the fracture cannot heal by external callus formation but can only heal by primary osteonal reconstruction. This primary bone healing can only take place by contact healing which needs an anatomical reduction and absolute stability with an interfragmentary strain less than 2%. This absolute stability means angle and rotational stability combined by dynamisation providing the necessary bone contact.

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