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Related Experiment Video

Updated: Dec 24, 2025

An Instrumented Pull Test to Characterize Postural Responses
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The Pull Test: A Dynamic Test to Confirm Hip Microinstability.

Kostas J Economopoulos1, Christopher Y Kweon2, Albert O Gee2

  • 1Orthopaedic Clinic Association, Phoenix, Arizona, U.S.A.

Arthroscopy, Sports Medicine, and Rehabilitation
|April 9, 2020
PubMed
Summary
This summary is machine-generated.

The Pull-Out Test accurately identifies hip microinstability using a distraction distance. A pull length of 1.3 cm or more indicates microinstability, aiding surgical decisions.

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Area of Science:

  • Orthopedic Surgery
  • Diagnostic Imaging
  • Sports Medicine

Background:

  • Hip microinstability is a challenging condition affecting patient outcomes.
  • Accurate diagnosis is crucial for effective treatment planning in hip arthroscopy.

Purpose of the Study:

  • To establish a specific distraction distance (pull length) cut-off for the Pull-Out Test.
  • To differentiate patients with and without hip microinstability.

Main Methods:

  • 100 patients undergoing hip arthroscopy were evaluated.
  • Hip microinstability was assessed using clinical tests and imaging.
  • The Pull-Out Test measured distraction distance in a specific hip position.

Main Results:

  • The hip microinstability group (HMI) showed an average pull length of 1.7 cm versus 0.9 cm in the non-HMI group (P < .001).
  • A cut-off of 1.3 cm demonstrated high diagnostic accuracy: sensitivity 0.91, specificity 0.96.
  • Positive predictive value was 0.91, and negative predictive value was 0.97.

Conclusions:

  • The Pull-Out Test is a valuable tool for diagnosing hip microinstability.
  • A pull length of ≥1.3 cm reliably indicates hip microinstability with high sensitivity and specificity.