In 2 patients (10%), delayed union occurred as there was a displaced butterfly fragment which united with the main fragment at the end of 16 weeks.
Delayed union occurred in 2 patients (10%) due to a large butterfly fragment, which went on to unite by 16 weeks.
In one patient (4%) there was a large butterfly fragment
in the inferior aspect of clavicle, which went on to unite with the main fragments at the end of 14 weeks.
For type-2 B1 Robinson classification (Displaced with simple or single butterfly fragment of middle third clavicle fracture) reconstruction plates were used in 10 patients (25%), pre contoured plates in 20 patients (50%) and dynamic compression plates in 0 patients (0%),IM nails used in 2 patients(5%).
In 2 patients it was due to large butterfly fragment at fracture site which united at 16 weeks and another 2patient it was due to comminution which went on to unite at 20weeks.
It was due to a large displaced butterfly fragment which united with the main fragment at the end of 14 weeks in one case, at the end of 16 week in another case, at the end of 18 week in one case and at the end of 20th week in one case.
The patients mean age at the time of presentation 36 yrs (Range: 18 to 60yrs) of the 24 patients 15 were due to motor vehicle accidents, 9 were due to fall, majority (60%) had isolated humeral injury, remaining 40% had other injuries in the body, nearly 60% fractures were comminuted with long butterfly fragment.
They are commonly comminuted with long butterfly fragment, occur in osteoporosis and have complex anatomy with limited options for internal fixation.
In the other case graded as unsatisfactory result, the fracture was grade-I open fracture with butterfly fragments
of both bones.