Stabilization of Canine Pelvic Osteotomies with AO/ASIF Plates and Screws

C.A. Hunt; A S. Litsky

doi:10.1055/s-0038-1633163

Veterinary and Comparative Orthopaedics and Traumatology, Inhaltsverzeichnis

Vet Comp Orthop Traumatol 1988; 01(01): 52-57
DOI: 10.1055/s-0038-1633163

Short Communication

Schattauer GmbH

Stabilization of Canine Pelvic Osteotomies with AO/ASIF Plates and Screws

Clinical Study of 42 Operations and in vitro Screw Pullout Tests in Canine Ilium

C.A. Hunt

^*From the Department of Surgery, Massachusetts Institute of Technology, Cambridge, MA USA

,

A S. Litsky

^**From the Department of Surgery, South Shore Veterinary Associates, South Weymouth, MA and the Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA USA

› Institutsangaben

Abstract

Stabilization of pelvic osteotomy with a 2.7 mm dynamic compression plate (DCP) for the treatment of hip dysplasia, was performed in 42 operations in 27 dogs. Screw loosening was observed in 11 osteotomies (26%), plate bending in six cases (14%) and plate breakage in two cases (4%). An in vitro experiment using the pelvic bones of young mixed breed dogs showed no significant difference in the holding power of AO/ASIF 2.7 mm cortical, 3.5 mm cortical and 3.5 mm fully threaded cancellous screws in the body of the ilium. The 2.7 mm DCP has an advantage over the 3.5 DCP in stabilizing pelvic osteotomy because it allows more screws to be used per unit length of plate, which possibly results in a more stable fixation.

Key words

Dynamic compression plate (DCP) - Pelvic osteotomy - Hip dysplasia - AO/ASIF plates and screws

Volltext

Referenzen

References
1 Hohn R B, Janes J M. Pelvic osteotomy in the treatment of canine hip dysplasia. Clin Orthop 1969; 62: 70-8.
2 Henry W B, Wadsworth P L. Pelvic osteotomy in the treatment of subluxation associated with hip dysplasia. J Am An Hosp Assoc 1975; 11: 636-43.
3 Schrader S C. Triple osteotomy of the pelvis as a treatment for canine hip dysplasia. J Am Vet Med Assoc 1981; 178: 39-44.
4 Schrader S C. Triple osteotomy of the pelvis and trochanteric osteotomy as a treatment for hip dysplasia in the immature dog: the surgical technique and results of 77 consecutive operations. J Am Vet Med Assoc 1986; 189: 659-65.
5 Slocum B, Devine T. Pelvic osteotomy technique for axial rotation of the acetabular segment in dogs. J Am An Hosp Assoc 1986; 22: 331-8.
6 Schatzker J, Sanderson R, Murnaghan J P. The holding power of orthopedic screws in vivo. Clin Orthop 1975; 108: 15-126.
7 Uhthoff H K. Mechanical factors influencing the holding power of screws in compact bone. J Bone Joint Surg (Br) 1973; 55: 633-9.
8 Lyon W F, Cochran J R, Smith L. Actual holding power of various screws in bone. Ann Surg 1941; 114: 376-84.
9 Vangsness C T, Carter D R, Frankel V H. In vitro evaluation of the loosening characteristics of self-tapped and non-self-tapped cortical bone screws. Clin Orthop 1981; 157: 279-86.
10 Ansell R H, Scales J T. A study of some factors which affect the strength of screws and their insertion and holding power in bone. J Biomechanics 1968; 1: 279-302.
11 Koranyi E, Bowman M S, Knecht C D, Janssen M. Holding power of orthopedic screws in bone. Clin Orthop 1970; 72: 283-6.
12 Nunamaker D M, Perren S M. Force measurements in screw fixation. J. Biomechanics 1976; 9: 669-75.
13 Frost H M. Implants. In Orthopedic Biomechanics. Springfield, Illinois: Charles C. Thomas; 1973: 409-25.
14 Methods of internal fixation. In: Newton C D, Nunamaker D M. ed. Textbook of Small Animal Orthopedics. Philadelphia: J B Lippincott; 1985: 261-86.
15 Smith A K. Biomechanics pertinent to fracture etiology, reduction and fixation. In Newton C D, Nunamaker D M. ed. Textbook of small animal orthopedics. Philadelphia: J B Lippincott; 1985: 195-230.