Published online Jul 18, 2013. doi: 10.5312/wjo.v4.i3.157
Revised: February 20, 2013
Accepted: March 28, 2013
Published online: July 18, 2013
Core tip: A 55-year-old female was diagnosed with L5-S1 degenerative disc disease. Initial scores by the visual analogue scale were 5 (back) and 9 (leg) and the Oswestry disability index was 32. Arthroplasty was performed. Clinical and radiographic monitoring took place thereafter at one month, three months, six months and annually. A malpositioned disc implant may impair normal spinal movement, culminating in heterotopic ossification or complete fusion of the operated segment.