Hi , Welcome to healthcaremagic
Normally the fracture
takes about 6 weeks to heal . During this period if the fingers have been properly strapped or nicely tied with a finger cot with EXTENSION BAR, then there should be no reason as to why fracture should not heal even at 6 weeks. Please do repeat an x ray
and get it seen by an orthopaedic surgeon
.If he feels everything is in position and healing is good then there is nothing to worry about. If healing is slow as in old age then it can be supplemented with calcium tablets. do continue to wear the splint
until the fracture is fully radiologically healed.