The effect of plate luting on reduction accuracy and biomechanics of acetabular osteotomies stabilized with 2.7-mm reconstruction plates.
OBJECTIVE
To compare the accuracy of reduction and biomechanical characteristics of acetabular osteotomies repaired with luted and nonluted reconstruction plates.


METHODS
In vitro study.


METHODS
Pelves removed from 12 adult greyhounds.


METHODS
Acetabular osteotomies were created and repaired with a 6-hole, 2.7-mm reconstruction plates in 24 cadaver hemipelves. Ten hemipelves each were assigned to group I and group II. An impression cast of each acetabulum in group I was made before luting (preluting cast). Group I plates were then elevated, luted, and replaced. A second cast of each acetabulum in group I was then made (postluting cast). Step, gap, and total areas of articular osteotomy incongruence were determined from the casts. Group I (luted plate repairs) and group II (nonluted plate repairs) hemipelves were loaded ventral-to-dorsal using a materials-testing machine. Stiffness, yield load, and maximal load sustained were determined.


RESULTS
Mean gap and total area of articular osteotomy incongruence for group I preluted plate repairs (7.1 mm(2) and 8.6 mm(2), respectively) were significantly greater than for group I postluted plate repairs (4.1 mm(2) and 5.1 mm(2), respectively). Mean stiffness and maximal load for group I (681 N/mm and 2,555 N, respectively) were significantly greater than for group II (360 N/mm and 1,730 N, respectively). Mean step area and mean load at yield values were not significantly different between groups.


CONCLUSIONS
Luted plate repairs of osteotomized acetabulae result in improved reduction and are stiffer and stronger than nonluted plate repairs.


CONCLUSIONS
Plate luting may improve the accuracy of reduction of acetabular fractures where anatomic reduction is required. Plate luting may also increase the stiffness and strength of fracture repairs and arthrodeses.
Anderson
Gregory M
GM
Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL, USA.
Cross
Alan R
AR
Lewis
Daniel D
DD
Lanz
Otto I
OI
D000077:Acetabulum / Q000293:injuries / Q000601:surgery*; D000818:Animals; D001696:Biomechanical Phenomena; D001843:Bone Cements / Q000592:standards; D001860:Bone Plates / Q000662:veterinary; D002102:Cadaver; D004285:Dogs / Q000293:injuries* / Q000601:surgery; D005593:Fracture Fixation, Internal / Q000379:methods / Q000592:standards / Q000662:veterinary*; D050723:Fractures, Bone / Q000601:surgery / Q000662:veterinary*; D010027:Osteotomy / Q000662:veterinary*
D001843:Bone Cements