[The effect of various nucleotomy techniques on biomechanical properties of the intervertebral disk].
OBJECTIVE
The purpose of the present investigation was to determine the significance of the technique of nucleotomy for the biomechanical properties of the intervertebral disc.


METHODS
From 29 human cadavers the lumbar-vertebral segment L2/3 was taken. The laminae were removed and the segment was tested by an mechanical testing device. Measurements were taken under physiological loads in flexion/extension, lateral bending and rotation direction. There after nucleotomy was simulated by four different procedures: perforation of the anulus with a diameter of 3 mm, rectangular excision (1 x 1 cm) of the anulus, discotomy with 3 g and 6 g nucleus pulposus. In each step the measurement was repeated.


RESULTS
The size of the defect in the anulus fibrosus did not have significant influence on the stiffness of the disc. There was a significant relation between quantity of removed disc material and flexibility of the motion segment.


CONCLUSIONS
The quantity of removed nucleus pulposus plays a crucial role in the segmental mobility whereas the size of the approach in the anulus fibrosus, f.e. endoscopic with a hole diameter of 3 mm or conventionally with a rectangular defect of 1 x 1 cm, did not influence mobility.
Zöllner
J
J
Orthopädische Universitätsklinik Mainz.
Rosendahl
T
T
Herbsthofer
B
B
Humke
T
T
Eysel
P
P
D000368:Aged; D000369:Aged, 80 and over; D001696:Biomechanical Phenomena; D017586:Diskectomy / Q000379:methods*; D005260:Female; D006801:Humans; D007403:Intervertebral Disc / Q000503:physiopathology*; D008159:Lumbar Vertebrae / Q000503:physiopathology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D010043:Outcome and Process Assessment, Health Care; D011183:Postoperative Complications / Q000503:physiopathology*
Der Einfluss verschiedener Nucleotomietechniken auf die biomechanischen Eigenschaften der Bandscheibe.