Initial stage of clinical union of bone is equivalent to
Callus formation with woven bone
Woven bone Formation
Haematoma formation
Calcification formation only
The first signs of union are seen in stage of hard callus formation A. Clinical sign:fracture is no more mobile B. Radilogical sign :callus is seen on X ray *hard callus is immature woven bone* Ref: Maheshwari 9th/e p 12
Anatomy and physiology of bone and fracture healing