PennHIP

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PennHIP (an acronym for "University of Pennsylvania Hip Improvement Program") is a program which evaluates the quality of the hips in dogs. [1] The program was established at the University of Pennsylvania School of Veterinary Medicine by Gail Smith [2] in 1993, with the primary objective of reducing the prevalence of hip dysplasia in dogs. [3] To assess a dog's hip joints, three radiographs (X-rays) are taken from different angles while the dog is under general anesthesia. [1] Radiographs are submitted to the PennHIP for assessment, and are assigned a score, called a distraction index. [1] Veterinarians must be trained members of the PennHIP Network in order to take radiographs for these assessments. [1] The scheme is available through veterinarians in the United States and Canada. [3] It was considered as the most evidence-based radiographic method to diagnose hip dysplasia. [4]

Contents

History

The PennHIP method was developed by Gail Smith at the University of Pennsylvania in 1983 with the current radiographic submission system dating back to 1993. [5]

In the 1990s, the Penn Center for Innovation (PCI) licensed PennHIP to a corporation, with Smith taking it back in 2002 and turning it into a not-for-profit service at Penn Vet. Recently, PCI facilitated the sale of PennHIP to Antech Imaging Services (Antech Diagnostics, Inc.), it is now called AIS PennHIP. [6]

Configurations and technique

The major quality of the PennHIP for the performing veterinarians is it gives an early indication for developing osteoarthritis of canine hip dysplasia as early as 16 weeks of the dogs age. The method requires the dogs to be under heavy sedation or anesthetized in dorsal recumbency position to eliminate muscle tension. Three radiographic exposures are made of the coxofemoral joint to evaluate the hip quality and quantitatively measure the joint laxity as following 1) distraction radiograph, 2) compression radiograph 3) ventrodorsal hip-extended radiograph with the distraction device being placed between the legs in neutral position and hips are distracted. The device acts as a fulcrum at the level of the proximal femur to lateralize the femoral heads when the performing veterinarian exerts minimal adduction force. [4]

The first two previously mentioned radiographs are used to obtain precise measurements on laxity and joint congruence, while the extended view is needed to collect further information on osteoarthritis if present. The purpose of these RXs is to obtain a technological calculated value that in the end an index of the joint laxity is given with less vulnerability to errors in comparison to the qualitative methods. [7]

The quantitative measure is called the distraction index (DI) which is the measurement of the maximal femoral head displacement from the acetabulum. It is calculated by dividing the distance between the geometric centre of the femoral head and the geometric centre of the acetabulum by the radius of the femoral head. The degree of presence of osteoarthritis increases as the DI value go over 0.3, meaning that the dog is in a higher risk of developing the condition. [8]

Alternatives

Drawbacks

See also

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References

  1. 1 2 3 4 Greer, MA (2014). "PennHIP". Canine Reproduction and Neonatology. CRC Press. p. 24. ISBN   9781498728508.
  2. ↑ "AIS | PennHIP". antechimagingservices.com. Retrieved December 2, 2019.
  3. 1 2 Smith, GK (2000). "Hip dysplasia diagnosis - the use of distraction radiography". In Morgan, JP; Wind, A; Davidson, AP (eds.). Hereditary bone and joint diseases in the dog: osteochondroses, hip dysplasia, elbow dysplasia . Hannover: Schlütersche. pp.  300–303. ISBN   3-87706-548-1.
  4. 1 2 Johnston, Spencer A., editor. Tobias, Karen M., editor. (June 14, 2017). Veterinary surgery : small animal volume one. ISBN   978-0-323-32049-8. OCLC   1030809494.{{cite book}}: |last= has generic name (help)CS1 maint: multiple names: authors list (link)
  5. ↑ Harasen, Greg (April 2009). "Assessing the dysplastic hip". The Canadian Veterinary Journal. 50 (4): 427–428. PMC   2657530 . PMID   19436454.
  6. ↑ "PennVet | Pioneering the Diagnosis of Canine Hip Dysplasia". www.vet.upenn.edu. Retrieved December 2, 2019.
  7. ↑ Sánchez Alonso, C.; García Luque, A.; Chamorro Sancho, M.J.; Arias Sanz, P.; De Vega Terán, P.; Crespo Castejón, F. (September 2015). "El Pennhip modificado y la sinfisiodesis juvenil pubiana como prevención de displasia de cadera canina en las Fuerzas Armadas" [Modified Pennhip and juvenile pubic symphysiodesis as canine hip dysplasia prevention in the Armed Forces]. Sanidad Militar (in Spanish). 71 (3): 146–157. doi: 10.4321/S1887-85712015000300002 .
  8. 1 2 Harari, Joseph (2000). Small Animal Surgery Secrets. Hanely & Belfus, INC. ISBN   1-56053-355-2.
  9. ↑ Harasen, Greg (April 2009). "Assessing the dysplastic hip". The Canadian Veterinary Journal. 50 (4): 427–428. PMC   2657530 . PMID   19436454.
  10. ↑ Williams, Ben (November 14, 2010). "Study compares PennHIP vs OFA hip dysplasia tests". American Animal Hospital Association. Retrieved December 2, 2019.
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