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Stability Reliability and External Validity of Myrick THIRD Test for Hip Labral Tears.

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The Myrick Hip Internal Rotation with Distraction (THIRD) test reliably identifies hip pain sources. This physical exam technique demonstrated high accuracy, outperforming MRA in a clinical setting.

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Area of Science:

  • Orthopedics
  • Diagnostic Imaging
  • Physical Examination Techniques

Background:

  • Intra-articular hip pain diagnosis lacks specific clinical assessment techniques.
  • The Myrick Hip Internal Rotation with Distraction (THIRD) test has established validity and reliability.
  • Need for reliable clinical assessment in hip pain diagnosis.

Purpose of the Study:

  • To evaluate the reliability and validity of the Myrick THIRD test in a new clinical setting.
  • To assess the stability and external validity of the Myrick THIRD test across multiple examiners.
  • To compare the diagnostic accuracy of the Myrick THIRD test against advanced imaging modalities.

Main Methods:

  • Prospective study including 86 patients aged 18-49 with hip pain.
  • Comparison of Myrick THIRD test results with Magnetic Resonance Arthrogram (MRA), Magnetic Resonance Imaging (MRI), and arthroscopy.
  • Statistical analysis included paired proportions, correlation, sensitivity, and specificity.

Main Results:

  • All 86 patients with a positive Myrick THIRD test were confirmed by arthroscopy.
  • The Myrick THIRD test showed a statistically significant higher accuracy rate than MRA (p=0.002).
  • Accuracy of the Myrick THIRD test was comparable to MRI (p=0.08).

Conclusions:

  • The Myrick THIRD test is a reliable and valid clinical assessment tool for intra-articular hip pain.
  • The Myrick THIRD test demonstrates superior accuracy compared to MRA for hip pain diagnosis.
  • This study supports the use of the Myrick THIRD test in clinical practice for evaluating hip pain.