J Med Assoc Thai 1998; 81 (11):824

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A Biomechanic Study of the Surgical Repair Technique of Pars Defect in Spondylolysis
Vathana P Mail, Prasartritha T

To find out which wiring technique of direct repair of the pars defect is the strongest
in resisting anteroposterior translation displacement, fifteen fresh human cadaveric L 4-Ls
spines were biomechanically tested by a universal testing machine. Two millimeters wide pars
defect was created on both sides of L4 vertebrae. Each of the five specimens was wired using
Nicol's technique (A), modified Nicol's technique (B) and modified pedicular screw technique respectively
(C). At each test, motion was observed to occur initially at the pars defect. The mean
minimum tensile strength (increment of the pars defect) for technique A, B and C was 87.64,
82.04 and 110.08 Kg Force respectively. By statistical analysis, technique C was the strongest
in resisting anteroposterior displacement of the spinal column. There was no statistically significant
difference between technique A and B.

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