differance b/w supracondylar fracture and elbow dislocation

1. in sc# 3 point relationship is unaltered.
2. arm length decrease in sc# and forearm length decrease in elbow dislocation.
in chronic cases, in elbow dislocation triceps shows cord sign.
and olecranon is prominent.
there will be thickening and irregularity along both lateral and medium column.