Malunion or abnormal union on the fracture segments, particularly in comminuted fractures, is usually as a result of rotational errors and may result in hip pain and gait abnormalities. It might be managed by corrective osteotomy (building cuts while in the bone To ease the symptoms and aid usual alignment). https://www.theorthopaedicandpainpractice.com/subtrochanteric-fractures-what-is-it-2/