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Table 1 APD increments and expansion ratio after laminoplasty in the literature

From: Cervical open-door laminoplasty technique with simple sutures and bone grafts: a single institutional study with 30 consecutive cases

  Technique Radiography Increments or expansion ratio at final follow-up
Hirabayashi [1] 1983 EL PLR Mean increase 3–4 mm
Hirabayashi [23]1999 EL PLR 4.4 mm
Chiba [6] 2006 EL PLR 4.4–5.9 mm
Satomi [2]1994 EL PLR 3.0 mm
Yang [16] 2007 Suture anchor fixation CT 38.4–54.3%
Baba [18] 1997 En bloc 3D CT Mean increase 42%
Baba [23] 1995 Tomita CT 6.8 mm 40%
O’Brien [8] 1996 Titanium   
Miniplate CT 8.4 mm 105%  
Wang [10] 1998 Anchor system PLR 6.3 mm 64%
Itoh [19] 1985 Bone blocks with wire ligatures PLR 4.1 mm
This study Simple sutures PLR 8.01 mm 136.23%
  1. EL: Expansive open-door laminoplasty; PLR: Plain lateral radiograph; CT: Computed tomography.