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Reliability problems associated with the modified Schöber technique for true lumbar flexion measurement
1Productive Rehabilitation Institute of Dallas for Ergonomics (PRIDE), Texas.
Spine
|March 1, 1992
Summary
The modified Schöber technique for measuring lumbar spine flexion shows poor reliability due to systematic errors and inconsistent landmarks. Its clinical and scientific utility is questionable for assessing spinal mobility.
Area of Science:
- Orthopedics
- Biomechanical analysis
- Physical therapy
Background:
- The Schöber technique is a common method for assessing lumbar spine flexion.
- Reliability of this technique is crucial for accurate clinical assessment and research.
Purpose of the Study:
- To analyze the inter-rater reliability of the modified Schöber technique for lumbar spine flexion.
- To identify sources of error affecting the reliability of this measurement.
Main Methods:
- Fifty healthy subjects were assessed using a blind inter-rater protocol.
- Considered factors included skin landmark presence, skin distraction, and measurement variability.
- Lumbar flexion mobility was evaluated using the modified Schöber technique.
Main Results:
- Inter-rater reliability was found to be moderate (r = 0.71), indicating systematic error.
- Skin landmarks for the technique were absent in 26% of subjects.
- Skin distraction occurred even over immobile structures, and the technique often failed to encompass the entire lumbar spine (T12-S1).
Conclusions:
- The modified Schöber technique is subject to significant systematic errors, compromising its reliability.
- Inconsistent landmark presence and skin distraction limit the accuracy of lumbar spine flexion measurement.
- The scientific and clinical utility of the modified Schöber technique is questionable.