Table 1: Description of Compared Surgical Techniques Described by Respective Authors

Author N FN M/F Age Compared Surgical Techniques
Savolainen 91 86 63m/23f 47,86 Disc Bone graft 1 Plate 1
Xie-Hulbert 45 42 28m/14f 42,76 Disc Bone graft 1 Plate 2
Van der bent 83 81 65m/16f 47 Disc PMMA
Hauerberg 88 79 43m/43f Median Disc cage Tit
Oktenoglu 20 20 11m/9f 40,5 Disc Bone graft 2 Plate 3
Rosenorn 63 63 40m/23f 51,5 Disc Bone graft 3
Martins 51 51 * 46,4 Disc Bone graft 3
Barlocher 125 123 74m/51f 50,5 Disc Bone graft 4 Cage Tit PMMA
Total 584 545 324/179 46,65

N rand=number of randomized patients at beginning. FN= Number of studied patients. M/W: male/woman proportion. Bone graft: 1:Smith-Robinson technique; 2:Tricortical bone Cage; 3:Cloward;4:Autologous bone graft. Cage Tit: Titaneum cage; PMMA: Polimethylmetacrilate; Plates (as described) 1: Caspar plate;2: Codman;3: Semirigid plate.
* Data originally described as median.