[A protocol of in vivo 3D experimental evaluation of global posture and motion of the spine].
OBJECTIVE
The aim of his study was to assess 3D global posture and movement of body segments, especially for scoliotic subjects. As scoliosis is a three-dimensional deformity, it needs three-dimensional evaluation and correction, but there is no mean today to get 3D dynamic examination of the whole body.


METHODS
Using opto-electronic methods, an experimental protocol was established to compare the pre- and post-operative results of treatment. Firstly, the reliability of the protocol was tested in healthy adult subject. Secondly, a reference group of 15 healthy teenagers was analysed Besides, first scoliotic subject in pre- and post-operative situations were followed. The markers fixed on the skin allowed us to calculate the position of the head, the pelvic, the shoulders and the spinal axis, during a static trial and motions.


RESULTS
The reliability of the protocol was satisfactory (standard deviation (s) < 5.4 degrees in a flexion movement). The inter-subject variability was greater for the position of the head than for the pelvis, the shoulders or the spinal axis. The scoliotic patient showed a straightening of the whole body in the three anatomic planes. One month after treatment, the range of motion were reduced (+13.8 degrees for the pelvic flexion during a flexion movement), but six months after surgery they were greater than before (+14.7 degrees).


CONCLUSIONS
Many systems have been proposed to measure the motion of the trunk, but they were not three-dimensional. The opto-electronic method is a non invasive, external and dynamic system.
Ployon
A
A
Laboratoire de Biomécanique, ENSAM, Paris.
Lavaste
F
F
Maurel
N
N
Skalli
W
W
Dubousset
J
J
Zeller
R
R
Rolland Gosselin
A
A
D000328:Adult; D001696:Biomechanical Phenomena; D002985:Clinical Protocols; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011184:Postoperative Period; D011187:Posture; D012600:Scoliosis / Q000503:physiopathology / Q000601:surgery; D013131:Spine / Q000502:physiology*
Protocole pour l'évaluation expérimentale 3D in vivo de la posture et de la cinématique globale du rachis.