Disc height reduction in adjacent segments and clinical outcome 10 years after lumbar 360 degrees fusion. - Schulte, Tobias L.; Leistra, Freek; Bullmann, Viola; Osada, Nani; Vieth, Volker; Marquardt, Björn; Lerner, Thomas; Liljenqvist, Ulf; Hackenberg, Lars (European Spine Journal, 2007)