[An experimental study on bone potentials at fracture site with axial interfragmental gradient compression].
OBJECTIVE
To evaluate the mechanism of stress generated potentials in compressive fixation leading to the primary healing.


METHODS
Eighteen fresh sheep tibiae were divided equally into three groups, and all specimen were fractured artificially and imposed "prestressing" at fracture sites with tension device and plate, meanwhile stainless wire tension band was used in the place opposite to plate. The interfragmental pressure was exerted when applied plates, which were 98.62 +/- 19.74 N, 137.93 +/- 8.13 N and 169.20 +/- 11.33 N. Bone potentials at fracture sites were recorded with reference to the potential measurement system by Friedenberg and Brighton (1966).


RESULTS
There was no significant statistical difference in bone potentials when made comparison between before and after compression fixation in each group and among groups of different axial interfragmental gradient compressions.


CONCLUSIONS
The mechanism of stress generated potentials may not exist in primary healing with compressive fixation.
Zhang
Y
Y
Department of Oral and Maxillofacial Surgery, College of Stomatology, Beijing University of Medical Sciences.
Liu
L
L
Shu
S
S
Li
Z
Z
Zhong
G
G
D000818:Animals; D001860:Bone Plates; D005593:Fracture Fixation, Internal / Q000379:methods*; D017102:Fracture Healing / Q000502:physiology*; D066298:In Vitro Techniques; D011199:Potentiometry; D012756:Sheep; D013314:Stress, Mechanical; D013978:Tibial Fractures / Q000503:physiopathology*