Canis ISSN: 2398-2942

Radiology: coxofemoral joint

Contributor(s): Ruth Dennis

Features assessed during scoring

  • See BVA/Kennel Club hip dysplasia scoring scheme for protocol BVA/Kennel Club hip dysplasia scheme.
  • The scrutineers work from a table detailing the scores to be allocated for various radiographic features.

Norberg angle

  • The Norberg angle is calculated using a medical orthopedic measurement device called an ischiometer Hip dysplasia ischiometer.
  • It represents an assessment both of the depth of the acetabulum and the presence of subluxation; a good Norberg angle exceeds 105° and penalty points are given for each block of 5° less than this, eg a Norberg angle of 92° scores 3.
  • The center point of each femoral head is marked on the radiograph by finding one of the concentric circles drawn on the ischiometer which most nearly fits the femoral head.
  • The centers are joined using a baseline, also drawn on the ischiometer, and a second line taken from the center of the each femoral head to the most craniolateral point of each acetabular surface.
  • The angle between the two lines is measured for each hip Pelvis Norbergs angle - diagrammatic representation.
  • If the acetabulum is shallow or the femoral head is subluxated then the Norberg angle is reduced Pelvis effect of subluxation on the Norberg angle - diagrammatic representation.

Subluxation

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Cranial effective acetabular rim

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Femoral head and neck exostoses

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Further Reading

Publications

Refereed papers

  • Recent references from VetMed Resource and PubMed.
  • Lust G, Todhunter R J, Hollis N E et al (2001) Comparison of radiographic methods for diagnosis of hip dysplasia in eight-month old dogs. JAVMA 219, 1242-1246.
  • Dennis R (1998) A Scheme to control hip dysplasia. Vet Nursing 13, 55-60.
  • Gibbs C (1997) The BVA/KC scoring scheme for control of hip dysplasia. Vet Rec 141, 275-284.


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