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Computed Tomographic Trochlear Depth Measurement in Normal Dogs.

Massimo Petazzoni1, Elena De Giacinto2, Daniele Troiano3

  • 1Clinica Veterinaria Milano Sud, Peschiera Borromeo, Milano, Italy.

Veterinary and Comparative Orthopaedics and Traumatology : V.C.O.T
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Summary
This summary is machine-generated.

The maximal patellar thickness relative to the trochlear groove depth in dogs varies widely. Breed-specific ratios are needed to guide patellar luxation surgery decisions.

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Area of Science:

  • Veterinary Orthopedics
  • Canine Anatomy
  • Medical Imaging

Background:

  • Patellar luxation is a common orthopedic condition in dogs.
  • Accurate measurement of patellar and trochlear dimensions is crucial for surgical planning.
  • Computed tomography (CT) offers detailed 3D visualization of stifle anatomy.

Purpose of the Study:

  • To define the relationship between maximal patellar craniocaudal thickness and femoral trochlear groove depth in normal dogs.
  • To assess the intra- and inter-observer variability in measuring these parameters using CT.
  • To evaluate the utility of the patellar thickness to trochlear depth ratio in surgical decision-making.

Main Methods:

  • Three-dimensional multiplanar reconstruction CT images of 40 canine stifles (20 dogs) were analyzed.
  • Maximal patellar craniocaudal thickness and maximal trochlear groove depth were measured by three independent veterinarians.
  • The ratio of maximal patellar thickness to trochlear depth was calculated.

Main Results:

  • The mean ratio of maximal patellar thickness to trochlear depth was 0.46 (range 0.24-0.70).
  • This indicates that, on average, the maximal trochlear depth is 46% of the maximal patellar thickness.
  • Significant variability was observed in this ratio across the studied population.

Conclusions:

  • A broad range in the patellar thickness to trochlear depth ratio suggests the need for breed-specific reference values.
  • Understanding this ratio is important for surgical planning in patellar luxation, particularly for sulcoplasty procedures.
  • Further studies should investigate breed-specific ratios and correlate them with patellar tracking from hyperflexion to hyperextension.