In vitro evaluation of allogeneic bone screws for use in internal fixation of transverse fractures created in proximal sesamoid bones obtained from equine cadavers.
OBJECTIVE
To evaluate effectiveness of allogeneic bone screws and pins for internal fixation of midbody transverse fractures of equine proximal sesamoid bones (PSBs) in vitro.


METHODS
14 forelimbs from cadavers of 3-year-old Thoroughbreds.


METHODS
Allogeneic cortical bone fragments were collected from the limbs of a male Thoroughbred, and cortical bone screws were prepared from the tissue by use of a precision desktop microlathe programmed with the dimensions of a metal cortical bone screw. A midbody transverse osteotomy of each PSB was performed by use of a bone-shaping oscillating saw and repaired via 1 of 3 internal fixation techniques: 1 allogeneic bone screw with 1 allogeneic bone pin (type I; n = 6 PSBs), 2 allogeneic bone screws (type II; 8), or 1 stainless steel cortical bone screw (control repair; 6). Mechanical tension measurements were obtained by use of a commercially available materials testing system.


RESULTS
Mean +/- SD tensile strength (TS) was 668.3 +/- 216.6 N for type I repairs, 854.4 +/- 253.2 N for type II repairs, and 1,150.0 +/- 451.7 N for control repairs.


CONCLUSIONS
Internal fixation of PSB fractures by the use of allogeneic bone screws and bone pins was successful. Although mean TS of control repairs with stainless steel cortical bone screws was greater than the mean TS of type I and type II repairs, the difference between type II and control repairs was not significant. Allogeneic screws may advance healing and result in fewer complications in a clinical setting.
Sasaki
Naoki
N
Department of Clinical Veterinary Science, Obihiro University of Agriculture and Veterinary Medicine, Inada-town, Obihirocity, Hokkaido 080-8555, Japan. naoki@obihiro.ac.jp
Takakuwa
Jun
J
Yamada
Haruo
H
Mori
Ryuji
R
D000818:Animals; D001863:Bone Screws / Q000662:veterinary*; D002102:Cadaver; D005528:Foot; D005552:Forelimb; D005593:Fracture Fixation, Internal / Q000295:instrumentation / Q000662:veterinary*; D050723:Fractures, Bone / Q000601:surgery / Q000662:veterinary*; D006736:Horses; D008297:Male; D012716:Sesamoid Bones / Q000293:injuries / Q000601:surgery*