<unk>  due to bone metastasis of breast cancer. Left image shows the metastasis, on the right a pathological fracture a few days later.<unk> s are fractures, typically of long bones, in which the fracture is transverse to the long axis of the bone, like a broken stick of chalk. A healthy long bone typically breaks like a hard woody stick as the collagen in the matrix adds remarkable flexibility to the mineral and the energy can run up and down the growth rings of bone. The bones of children will even follow a greenstick fracture pattern.<unk> s are particularly common in Paget's disease of bone, and osteopetrosis. It is also seen in cases of fused spine as in a patient with ankylosing spondylitis.
Chalkstick fracture
Bumper fracture
Bosworth fracture
Rolando fracture
Hume fracture
Holdsworth fracture
Jefferson fracture
Duverney fracture