There are several reasons for continued pain after placement of a dynamic hip screw system.
The fracture may not be healed. There may be a nonunion.
The hardware may have been improperly placed. The screw may be in the joint.
There may be soft tissue damage that has not yet healed.
There may be avascular necrosis (AVN) of the femoral head.
There may be an indolent infection.
There are so many reasons for continued pain after placement of a DHS. It will take a thorough examination and several studies to determine the exact cause. It is not possible to tell you exactly what the cause is, over the internet. You need to see an orthopedic surgeon.