Re: Siepe CJ, Hitzl W, Meschede P, et al. Interdependence between disc space height, range of motion and clinical outcome in total lumbar disc replacement. Spine 2009;34:904-16
Spine (Phila Pa 1976). 2010 Aug 1;35(17):1660; author reply 1660-1.
doi: 10.1097/BRS.0b013e3181e5cba3.