Saving Limbs and Lives Everyday®
Bone Defomity - Crooked Bones

Lower extremity deformities are most often the result of the person being born with a deformity (congenital) or the person developing the problem later in life (acquired).


The following are congenital problems in which we have special interests:

  • Congenital short femur (thigh)
  • Proximal femoral focal deficiency (thigh)
  • Tibial and fibular hemimelia (shin and calf/leg)
  • Congenital pseudoarthrosis of tibia (leg bone)
  • Club foot


If a child is born with a congenital problem of the arm or leg, where it is not a normal limb, the child should be evaluated as soon as possible. There are often other problems associated with a short or crooked leg, such as a defective kidney, that need to be discovered. The sooner you have a specialist make the proper diagnosis, the sooner you will know what can be done to help your child.


Acquired deformities may develop following an accident or an infection (post-traumatic cause or osteomyelitis). Fractures that heal crooked (malunion), or not at all (non-union) can lead to deformities.


Treatments for these problems can range from an insert in the shoe all the way to major bone lengthening. We can straighten crooked bones and can lengthen from 2-6 inches as needed. Nonhealing bones can be repaired using bone stimulators alone, or injection of special proteins into the bone, or the problem may need complex restructuring with a device that encircles the leg - an external fixator (or Taylor Spatial Frame).


Problems with short, crooked, or nonhealing bones can be fixed. A consultation with our team of specialists will let you know what treatment your problem will need, and you can then decide when and how to proceed.


Meet the Team

David B. Hahn, MD

thumb_hahn_nov07David B. Hahn, MD is the medical director of the Bone Healing service at The Denver Clinic for Extremities at Risk.  His areas of expertise are wire fixators for nonunion and deformity correction, allograft bone transplant and difficult foot and ankle problems.