poker back
spon·dy·li·tis de·for·mans
arthritis and osteitis deformans involving the spinal column; marked by nodular deposits at the edges of the intervertebral disks with ossification of the ligaments and bony ankylosis of the intervertebral articulations, it results in a rounded kyphosis with rigidity.
Farlex Partner Medical Dictionary © Farlex 2012
poker back
Stiffness of the spine that may result from ankylosing spondylitis or related conditions.
Medical Dictionary, © 2009 Farlex and Partners