Method for assessing canine hip dysplasia

Details Method for assessing canine hip dysplasia Method for assessing canine hip dysplasia

1993-11-01

1996-01-09

Hindenburg, Max

Surgery

Truss

Pad

A61B 500

Patent

active

054820553

ABSTRACT:
A method for determining the hip joint laxity of a dog includes the steps of positioning the hip joints of the dog, in a coordinate system having three degrees of freedom, a first degree of freedom for flexion and extension of the hip joint, a second degree of freedom for adduction and abduction of the hip joint, and a third degree of freedom for internal and external rotation of the hip joint, where a neutral position is defined as positioning of an axis of the femur perpendicular to a plane defined by both ischiatic tuberosities and both cranial dorsal iliac spines and where both femoral condyles are perpendicular to the long axis of the pelvis, between 10 degrees of flexion and 30 degrees of extension, between about 10 and about 30 degrees of abduction, and from about zero degrees of rotation to about 10 degrees of external rotation; applying a lateral outward force on the femoral head, the magnitude of the force being sufficient to cause the hip to enter a high stiffness region and, while maintaining the lateral outward force on the femoral head, obtaining a radiographic image of the hip.

REFERENCES:
patent: 5228454 (1993-07-01), Siegler
G. K. Smith, D. N. Biery & T. P. Gregor, New Concepts of coxofemoral joint stability and the development of a clinical stress radio graphic method for quantitating hip joint laxity in the dog, Journal of the American Veterinary Medical Association, vol. 196, No. 1, pp. 59-70 (1990).
S. J. Heyman, M. A. Cofone & G. K. Smith, A Biomechanical Study of the Relationship of Coxofemoral Positioning to Passive Hip Joint Laxity in the Dog, Veterinary Surgical Journal, Sep.-Oct. 1992, p. 392.
"Hip Dysplasia", in James A. Baker Institute for Animal Health, Cornell Univesity, Annual Report 1988.

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