I saw a hand amputation, via boat motor, when i was working in the ed the other day. The attending called ortho and vascular. Not really sure what happened to the guy once he went to the OR but I think it was a nice clean cut to give the surgeons some good vessels to work with.
Currently trauma surgeons have little training in orthopedics and none in microvascular (unless they have obtained it outside of their fellowship program).
As others have noted, replants are typically the realm of ortho or plastics and are commonly a multi-team procedure, with vascular possibly being involved as well. The trauma surgeon gets to admit the patient to their service and take care of his other needs, while everyone else gets to have fun in the OR.