Table 2. Range of Motion Preservation Reported Since 2003.

Study	Technique	No. of Patients	Follow-Up	Postoperative Range of Motion
Chiba et al, 20061	ODL	80	14 y	−36%
Kang et al, 200712	ODL	20	19.45 mo	−31.8%
Takeuchi et al, 200716	ODL	70/41	19/30 mo	−47.4%/−19.2%
Hyun et al, 200911	ODL	23	26.78 mo	−31.66%
Kotani et al, 200914	ODL	42/42	43 mo	Not given
Otani et al, 20092	ODL	13	5 y	−13.3%
Sakaura et al, 201017	ODL	36	>24 mo	−24.3%/26%

ODL, open-door laminoplasty.