HD Auswertung England
Da oftmals gefragt wird, was
die Zahlen bei der HD Auswertung in England zu bedeuten haben, habe
ich einige Informationen zusammen gesucht, die dies sehr gut erklären.
Ich habe sie nicht ins Deutsche übersetzt, denke aber, dass das
Wesentlich gut verständlich ist.
In England wird jede Seite einzeln beurteilt, pro Seite werden 9 Kriterien
untersucht und mit Punkten von 0-6 (Ausnahme Hintere Acetabulum Begrenzung
die nur 0-5) bewertet.
Je weniger Punkte, desto besser. Zusätzlich wird in England ein
Mittelwert (BMS) der einzelnen untersuchten Rassen gebildet (beim Beardie
beträgt er momentan 11).
Ich habe auch eine Tabelle
beigefügt, in der die Bewertungen von Deutschland, der Schweiz,
England, Schweden, Finnland, den Niederlanden und den USA aufgeführt
sind und somit der Vergleich erleichtert wird. Ich möchte aber
darauf hinweisen, dass es sich hierbei nur um eine Zusammenstellung
handelt und nicht um einen von der FCI festgelegten Vergleich.
Hip Scoring
The British Veterinary Association
(BVA) and The Kennel Club in the UK (TKC) have joined together to run
a hip scoring scheme for breeders, in order to test for canine hip dysplasia,
the most common inherited joint problem of large breed dogs. This current
system came into effect in 1984.
Dogs are scored from the age of 12 months, and can only be scored once
in their lifetime.
The BVA/TKC publish a list of Breed Mean Scores (BMS) for each breed,
together with the number of dogs tested to date and the range of scores
achieved. It is then recommended that breeders ensure their breeding
stock have scores which are well below the BMS.
From an x-ray taken at the owner's vets, the BVA scores each of the
hip joints:
1. the norberg angle (0-6);
2. subluxation (0-6);
3. cranial acetabular edge (0-6);
4. dorsal acetabular edge (0-6);
5. cranial effective acetabular rim (0-6);
6. acetabular fossa (0-6);
7. caudal acetabular edge (0-5);
8. femoral head and neck exostosis (0-6);
9. femoral head recontouring (0-6),
thus each hip can receive a maximum score of 53 and overall score of
106. The lower the score the better, so 0/0 would be perfect, while
53/53 would mean that the dog had no hips at all!
Diagram
shows scores of 0.
AF - Acetabular fossa
AN - Acetabular notch
FH - Femoral head
FV - Foveal defect
DAE - Dorsal Acetabular edge
CaAE - Caudal acetabular edge
CrAE - Cranial acetabular edge
CrEAR - Cranial effective acetabular rim
Norberg Angle
Measures two features - the degree of congruence between the FH and
acetabulum and the length of the CrAE which gives a relative indication
of acetabular depth.
Subluxation
Evaluation is based principally on the degree of congruence between
the femoral had and acetabulum. The general 'fit' of these two components
is assessed by the relationship between the FHC and the underlying image
of the DAE; the configuration of the cranial joint space is also taken
into account, particularly at the lower end of the scoring scale, when
abnormalities are relatively minor. The cranial joint space is seen
as a radiolucent shadow between the CrAE and adjacent cranial articular
margin of the FH. For a zero score the FHC must be medial to the DAE
and the cranial joint space uniformly narrow, with the curve of the
CrAE eactly following that of the FH.
Cranial Acetabular Edge
Minor alterations in the shape, contour and possibly the length of the
CrAE are generally believed to be indicators of poor articular congruence,
while more severe changes are clearly consequences of chronic instability,
abnormal marginal wear and remodelling of the joint. For a score of
zero the CrAE should be convex, uniformly curved and match exactly the
countour of the adjacent femoral head with no lateral or medial divergence
of the cranial joint space.
Dorsal Acetabular Edge
On good quality radiographs, the DAE forms a well-defined density interface
which traverses the fH almost vertically and extends a little beyong
it cranially and caudally. The clarity whith which it can be seen is
highly variable. A minor change in the contour of the DAE, which is
normall slightly curved, merits a score of 1, but small localised irregularities,
seen only on radiographs of exceptionally high quality, are considered
to be within normal limits. Higher scores are related to definitive
pathological changes associated with degenerative joint disease (osteoarthritis),
the smallest being minor exostosis, which is usually seen cranially.
Cranial Effective Acetabular Rim
The earliest detectable abnormalities of the CrEAR are either minor
exostosis, usually in the form of a small, well-modelled osteophyte,
or slight 'rounding off' of the junction between the CrAE and DAE, which
may be seen in the presence of a non-biblabiated CrAE.
Acetabular Fossa
Detectable bone deposition in the AF is almost always associated with
marked subluxation and the amount tends to increase in proportion with
the increase in the other radiographic hallmarks of secondary degennerative
joit disease (osteoarthritis). Objective numerical scoring of this criterion
is difficult, but as changes are likely to be recorded only in dogs
with a total score considerably higher han average, the importance of
a high level of accuracy is diminished.
Caudal Acetabular Edge
The CaAE is the segment of the acetabulum which is subject to the widest
range of normal radiographic variation. Radiographic abnormalities are
scored between 0 and 5 and changes are due mainly to exostosis with
signs of wear being apparent only in advanced cases.
Femoral Head and Neck Exostosis
The normal FH should have a smooth rounnnnndish profile, but the shape
may vary considerably.
Recontouring of the Femoral Head
This criterion is used to record the extent to which the FH shape is
altered as a consequence of instability. Thus scores are likely to be
awarded only in cases in which secondary changes are well established,
when remodelling occurs as a result of the combined effects of periarticular
new bone formation and loss of subchondral bone following total destruction
of articular cartilage.
Scoring Criteria: