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Related Experiment Videos

Force and time recording for validating the sacroiliac distraction test.

Ulla Levin1, Christina H Stenström

  • 1Division of Physiotherapy, Neurotec Department, Karolinska Institutet, 141 83 Huddinge, Stockholm 23100, Sweden. ulla.levin@neurotec.ki.se

Clinical Biomechanics (Bristol, Avon)
|October 7, 2003
PubMed
Summary

Force and time measurements during sacroiliac joint distraction tests can help differentiate pain in patients with sacroiliitis from healthy individuals. This objective method aids in standardizing pain provocation assessments.

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Area of Science:

  • Orthopedics
  • Physical Therapy
  • Biomechanics

Background:

  • Sacroiliac joint tests show conflicting validity in clinical practice.
  • Previous research has not combined force recording with patient pain reports during these tests.

Purpose of the Study:

  • To determine if applied force and duration of force exposure during sacroiliac distraction tests can distinguish between individuals with sacroiliitis pain and healthy subjects.
  • To explore objective measurement methods for manual orthopedic tests.

Main Methods:

  • A methodological study utilizing force plates to measure three orthogonal forces.
  • Eleven subjects with sacroiliitis and 11 healthy subjects underwent a sacroiliac distraction test performed by three physiotherapists.
  • Subjects indicated pain by pressing a button, which was recorded alongside force data.

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Main Results:

  • The sacroiliitis group exhibited significantly smaller force magnitudes and shorter time intervals (P<0.05) compared to the healthy group.
  • Test sensitivity was 0.55 overall, with a range of 0.55-0.82 across physiotherapists, while specificity was 1.0.
  • Pain provocation could occur after a considerable time interval (up to 20 seconds).

Conclusions:

  • Force and time recording during sacroiliac distraction tests offer an advantageous, objective method for pain evaluation.
  • Further research is needed to assess the impact of force application velocity, pressure maintenance, and force distribution on test sensitivity.
  • Objective, easily performable evaluation methods are crucial for standardizing manual sacroiliac joint pain provocation tests.