What are the characteristics of the primary bone healing process?

What are the characteristics of the primary bone healing process?

Primary osteonal reconstruction requires absolute stability with an interfragmentary strain of less then 2%. Contact healing or gap healing only occurs with anatomic alignment of the fracture ends with a maximum width of the gap of maximal 1mm. Another anatomical factor compromising the fracture healing is the intra-articular position of the fracture where the synovial fluid prevents blood clot formation thereby eliminating a factor contributing to bone healing.

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