Stage	Clinical findings	Radiological findings
0 Inflammatory	Localized warmth, oedema/swelling and erythema	Almost normal or minimal abnormality
1 Developmental	Marked localized swelling, warmth, and redness; minor bone deformity, joint instability (ligamentous laxity).	Focal bone demineralization (osteopenia). Bony debris at articular margins. Fragmentation of subchondral bone. Periarticular fracture. Subluxation, and/or dislocation.
2 Healing	Continued but decreased warmth, oedema and erythema, major bone deformity, bone instability	Absorption of fine osseous debris. Coalescence/fusion of bone fragments. Callus formation and/or new periosteal bone formation. Sclerosis of bone ends.
3 Remodelling	No warmth, swelling, redness, fixed bone deformity, joint stiffness	Appearance of a mature fracture callus. Bony remodelling of major fragments. Decreased sclerosis (rounding of bone ends) signify the finality of the permanent deformity