pseudoarthrosis is a disease which will not allow a break in a leg to heal. it is very rare but even more so to have it in both legs. symptoms of the disease are bowed legs, unrecognized pain, limping, and inability to walk. it usually leaves around the age of 18-20 when growth ends.
Not unless the spine doesn't completely fuse. When the fusion doesn't take, it's possible for the spine to curve again. This condition - failure to fuse - is called pseudarthrosis, and is pretty rare.
O. Verbeek has written: 'Reconstructive surgery of the long bones with autogenous and homogenous grafts' -- subject(s): Autotransplantation, Bone and Bones, Bone-grafting, Bones, Homologous Transplantation, Pseudarthrosis, Surgery, Transplantation, Tumors, Wounds and injuries