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A Systematic Review of Animal Models of Trochlear Dysplasia Development: Rationalization for a Large-Animal Model.

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Small animal models can reliably induce trochlear dysplasia, a key factor in patellofemoral instability. Early surgical intervention prevented dysplasia, but further research is needed for human relevance.

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Area of Science:

  • Orthopedics
  • Developmental Biology
  • Biomechanical Engineering

Background:

  • Trochlear dysplasia is a primary risk factor for patellofemoral instability.
  • Human trochlear dysplasia development remains poorly understood.
  • Animal models offer insights but have anatomical limitations.

Purpose of the Study:

  • To systematically review existing animal models of trochlear dysplasia.
  • To evaluate their effectiveness, limitations, and translational relevance.
  • To inform future research directions for understanding and treating this condition.

Main Methods:

  • Systematic review following PRISMA guidelines.
  • Searched PubMed, Embase, and Scopus for studies inducing trochlear dysplasia in animals.
  • Included studies with control groups and radiographic measurements (sulcus angle/depth).

Main Results:

  • 18 studies induced trochlear dysplasia in rabbits, rats, and mice.
  • Varied interventions (operative/nonoperative) led to progressive changes.
  • Severity and rate differed by species and intervention; early patellar reduction prevented dysplasia.

Conclusions:

  • Small animal models reliably induce trochlear dysplasia.
  • Early patellar reduction shows preventative potential.
  • Longitudinal data and large-animal models are needed for greater translational fidelity.