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Reliability of Existing Measures and Classification Systems For Trochlear Dysplasia.

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Assessing trochlear dysplasia in adolescent patellofemoral instability (PFI) lacks reliable radiographic criteria. Current methods show poor to moderate interrater reliability, highlighting the need for improved diagnostic tools for this common condition.

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Area of Science:

  • Orthopedics
  • Radiology
  • Pediatric Sports Medicine

Background:

  • Patellofemoral instability (PFI) is prevalent in adolescents, impacting quality of life and potentially leading to arthritis.
  • Trochlear dysplasia is the most frequent anatomical risk factor identified in PFI cases.
  • Effective PFI treatment necessitates accurate assessment and potential surgical correction of underlying anatomical abnormalities.

Purpose of the Study:

  • To evaluate the interrater reliability of current diagnostic measures for trochlear dysplasia.
  • To assess the consistency of various classification systems used in diagnosing trochlear dysplasia.

Main Methods:

  • A cohort study involving 60 knees (40 with PFI, 20 controls) with lateral radiographs and MRI.
  • Five pediatric orthopedic surgeons assessed trochlear dysplasia, blinded to diagnosis.
  • Evaluated measures included radiographic signs (crossing sign, double contour sign), continuous variables (sulcus angle, trochlear depth), and classifications (Oswestry-Bristol, Dejour).

Main Results:

  • Interrater agreement on MRI slice selection was 69%.
  • Radiographic signs like the crossing sign showed poor reliability.
  • Continuous variables exhibited poor reliability, with moderate reliability for lateral inclination angle and trochlear bump height. Classification systems (OB, Dejour) showed fair reliability.

Conclusions:

  • Existing radiographic criteria for assessing trochlear dysplasia demonstrate limited to moderate interrater reliability among pediatric orthopedic surgeons.
  • There is a clear need for the development of more reliable methods for evaluating and classifying trochlear dysplasia.
  • Improved diagnostic accuracy for trochlear dysplasia is crucial for effective PFI management in adolescents.