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Related Experiment Videos

The unstable patella in children.

H Bensahel1, P Souchet, G F Pennecot

  • 1Service de Chirurgie Orthopédique, Hôpital Robert Debré, Paris, France.

Journal of Pediatric Orthopedics. Part B
|January 6, 2001
PubMed
Summary

This study on 102 unstable patellas highlights developmental dysplasia of the patella (DDP) as a unifying concept. It categorizes instability and guides surgical treatment for improved outcomes.

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Area of Science:

  • Orthopedic Surgery
  • Pediatric Orthopedics
  • Radiology

Background:

  • Unstable patella is a common orthopedic condition with various causes.
  • Previous classifications have not fully encompassed the spectrum of patellar instability.
  • Understanding the underlying etiology is crucial for effective management.

Purpose of the Study:

  • To review and classify different types of patellar instability.
  • To introduce and emphasize the concept of developmental dysplasia of the patella (DDP).
  • To correlate clinical findings and imaging with surgical outcomes.

Main Methods:

  • Retrospective review of 102 cases of unstable patellas treated between 1964 and 1990.
  • Classification based on etiology: traumatic dislocations, recurrent dislocations, and malformative instability.

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  • Clinical examination and standard X-rays in all cases; MRI for congenital dislocations.

    • Main Results:

    • Two types of patellar instability were identified: Type 1 (joint laxity without major X-ray anomalies) and Type 2 (femoropatellar dysplasia with bone deformity).
    • Type 2 was associated with malformative instability.
    • Four surgical procedures were employed, ranging from soft tissue release to bony realignment.

    Conclusions:

    • Developmental dysplasia of the patella (DDP) provides a comprehensive framework for understanding patellar instability.
    • DDP can encompass various forms of patellar instability, including traumatic, recurrent, and malformative types.
    • Tailored surgical approaches based on the specific type of DDP are essential for successful treatment.