Asymmetrical lumbosacral transitional vertebrae in dogs may promote asymmetrical hip joint development

Mark A. Flückiger; Frank Steffen; Michael Hässig; Joseph P. Morgan

doi:10.3415/VCOT-16-05-0072

Veterinary and Comparative Orthopaedics and Traumatology, Table of Contents

Vet Comp Orthop Traumatol 2017; 30(02): 137-142
DOI: 10.3415/VCOT-16-05-0072

Original Research

Schattauer GmbH

Asymmetrical lumbosacral transitional vertebrae in dogs may promote asymmetrical hip joint development

Mark A. Flückiger

¹Clinic of Diagnostic Imaging, Department of Small Animal Clinics, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland

,

Frank Steffen

²Clinic of Small Animal Surgery, Department of Small Animal Clinics, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland

,

Michael Hässig

³Section of Herd Health, Department of Farm Animal Clinics, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland

,

Joseph P. Morgan

⁴Department of Small Animal Surgery, School of Veterinary Medicine, St. George’s University, Grenada, West Indies

› Author Affiliations

Abstract

Summary

Objectives: This study examines the relationship between the morphology of the lumbosacral transitional vertebra (LTV) and asymmetrical development of the hip joints in dogs.

Methods: A total of 4000 dogs which had been consecutively scored for canine hip dysplasia were checked for the presence of a LTV. A LTV was noted in 138 dogs and classified depending on the morphology of the transverse processes and the degree of contact with the ilium.

Results: In dogs with an asymmetrical LTV, the hip joint was significantly more predis-posed to subluxation and malformation on the side of the intermediate or sacral-like transverse process (p <0.01), on the side of the elevated pelvis (p <0.01), or when an asymmetrical LTV resulted in pelvic rotation on its long axis (p <0.01), whereas hip joint conformation was less affected on the side featuring a free transverse process (p <0.01).

Clinical significance: The results support our hypothesis that an asymmetrical LTV favours pelvic rotation over its long axis, resulting in inadequate femoral head coverage by the acetabulum on one side. Inadequate coverage of the femoral head favours subluxation, malformation of the hip joint, and secondary osteoarthritis. Asymmetrical hip conformation may therefore be the sequela of a LTV and mask or aggravate genetically induced canine hip dysplasia.

Keywords

Lumbosacral transitional vertebrae - dog - developmental orthopaedic disorders - diagnostic radiology - hip dysplasia

Full Text

References

References
1 Damur-Djuric N., Steffen F., Hässig M.. et al. Lumbosacral transitional vertebrae in dogs: classification and prevalence in various breeds. Vet Radiol Ultrasound 2006; 47: 32-38.
2 Morgan JP.. Transitional lumbosacral vertebral anomaly in the dog: a radiographic study. J Small Anim Pract 1999; 40: 167-172.
3 Larsen JS.. Lumbosacral transitional vertebrae in the dog. Vet Radiol Ultrasound 1977; 18: 76-79.
4 Breit S., Knaus I., Kunzel W.. Differentiation between lumbosacral transitional vertebrae, pseudolumbarisation, and lumbosacral osteophyte formation in ventrodorsal radiographs of the canine pelvis. Vet J 2003; 165: 36-42.
5 Tini PG., Wieser C., Zinn WM.. The transitional vertebra of the lumbosacral spine: its radiological classification, incidence, prevalence, and clinical significance. Rheumatol Rehabil 1977; 16: 180-185.
6 Winkler W., Loeffler K.. Lumbosakrale Übergangswirbel beim Hund [Lumbosacral transitional vertebrae in the dog]. Berl Münch Tieraerztl Wochenschr 1986; 99: 343-346.
7 Castellvi AE., Goldstein LA., Chan DP.. Lumbosacral transitional vertebrae and their relationship with lumbar extradural defects. Spine 1984; 9: 493-495.
8 Morgan JP.. Congenital anomalies of the vertebral column of the dog: A study of the incidence and significance based on a radiographic and morphologic study. Vet Radiol Ultrasound 1968; 9: 21-29.
9 Breit S., Kunzel W.. The diameter of the vertebral canal in dogs in cases of lumbosacral transitional vertebrae or numerical vertebral variations. Anat Embryol (Berl) 2002; 205: 125-133.
10 Morgan JP., Wind A., Davidson AP.. Hereditary Bone and Joint Diseases in the Dog: Osteochondroses, Hip Dysplasia, Elbow Dysplasia. Hannover: Schlütersche 2000; 109-208.
11 Morgan JP., Bahr A., Franti CE.. et al. Lumbosacral transitional vertebrae as a predisposing cause of cauda equina syndrome in German shepherd dogs: 161 cases (1987-1990). J Am Vet Med Assoc 1993; 202: 1877-1882.
12 Wigger A., Julier-Franz Ch., Tellhelm B.. et al. Lumbosakraler Übergangswirbel beim Deutschen Schäferhund: Häufigkeit, Formen, Genetik und Korrelation zur Hüftgelenksdysplasie [Lumbosacral transitional vertebrae in the German Shepherd dog: prevalence, classification, genetics and association with canine hip dysplasia]. Tieraerztl Prax 2009; 37 K 7-13.
13 Lappalainen AK., Salomaa R., Junnila J.. et al. Alternative classification and screening protocol for transitional lumbosacral vertebra in German Shepherd dogs. Acta Veter Scand 2012; 54: 27-37.
14 Morgan JP., Wind A., Davidson AP.. Bone dysplasias in the labrador retriever: a radiographic study. J Am Anim Hosp Assoc 1999; 35: 332-340.
15 Riser WH.. The dog as a model for the study of hip dysplasia. Growth, form, and development of the normal and dysplastic hip joint. Vet Pathol 1975; 12: 234-334.
16 Lust G.. An overview of the pathogenesis of canine hip dysplasia. J Am Vet Med Assoc 1997; 210: 1443-1445.
17 Smith GK., Popovitch CA., Gregor TP.. et al. Evaluation of risk factors for degenerative joint disease associated with hip dysplasia in dogs. J Am Vet Med Assoc 1995; 206: 642-647.
18 Smith GK., Biery DN., Gregor TP.. New concepts of coxofemoral joint stability and the development of a clinical stress-radiographic method for quantitating hip joint laxity in the dog. J Am Vet Med Assoc 1990; 196: 59-70.
19 Hedhammar A., Wu FM., Krook L.. et al. Overnutrition and skeletal disease: An experimental study in growing Great Dane dogs. Cornell Vet 1974; 64 (Suppl. 05) Suppl 11-160.
20 Kasstrom H.. Nutrition, weight gain and development of hip dysplasia. An experimental investigation in growing dogs with special reference to the effect of feeding intensity. Acta Radiol (Suppl) 1975; 344: 136-178.
21 Corley EA.. Hip dysplasia: a report from the Orthopedic Foundation for Animals. Semin Vet Med Surg (Small Anim) 1987; 02: 141-151.
22 Swenson L., Audell L., Hedhammar A.. Prevalence and inheritance of and selection for hip dysplasia in seven breeds of dogs in Sweden and benefit: cost analysis of a screening and control program. J Am Vet Med Assoc 1997; 210: 207-214.
23 Lust G., Geary JC., Sheffy BE.. Development of hip dysplasia in dogs. Am J Vet Res 1973; 34: 87-91.
24 Morgan JP.. Hip dysplasia in the Beagle: a radiographic study. J Am Vet Med Assoc 1974; 164: 496-498.
25 Citi S., Modenato M., Rossi F.. et al. A radiological study of the incidence of unilateral canine hip dysplasia. Schweiz Arch Tierheilkd 2005; 147: 173-178.
26 Flückiger M.. The standardized analysis of radiographs for hip dysplasia in dogs. Objectifying a subjective process. Europ J Comp Anim Pract 1995; 5: 39-44.
27 Broeckx BJG., Verhoeven G., Coopman F.. et al. The effects of positioning, reason for screening and the referring veterinarian on prevalence estimates of canine hip dysplasia. Vet J 2014; 201: 378-384.
28 Komsta R., Łojszczyk-Szczepaniak A., Dębiak P.. Lumbosacral transitional vertebrae, canine hip dysplasia, and sacroiliac joint degenerative changes on ventrodorsal radiographs of the pelvis in police working German Shepherd dogs. Top Companion Anim Med 2015; 30: 10-15.
29 Smith GK., Biery DN., Gregor TP.. New concepts of coxofemoral joint stability and the development of a clinical stress-radiographic method for quantitating hip joint laxity in the dog. J Am Vet Med Assoc 1990; 196: 59-70.