Index to Chiropractic Literature
Index to Chiropractic Literature
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ID 22628
  Title Optimized prediction of contact force application during side-lying lumbar manipulation
Journal J Manipulative Physiol Ther. 2012 Nov-Dec;35(9):669-677
Peer Review Yes
Publication Type Article

Objectives: The purposes of this study included the following: (1) to predict L3 contact force during side-lying lumbar manipulation by combining direct and indirect measurements into a single mathematical framework and (2) to assess the accuracy and confidence of predicting L3 contact force using common least squares (CLS) and weighted least squares (WLS) methods.

Methods: Five participants with no history of lumbar pain underwent 10 high-velocity, low-amplitude lumbar spinal manipulations at L3 in a side-lying position. Data from 5 low-force criterion standard trials where the L3 contact force was directly measured were used to generate participant-specific force prediction algorithms. These algorithms were used to predict L3 contact force in 5 experimental trials performed at therapeutic levels. The accuracy and effectiveness of CLS and WLS methods were compared.

Results: Differences between the CLS-predicted forces and the criterion standard–measured forces were 621.0 ± 193.5 N. Differences between the WLS-predicted forces and the criterion standard–measured forces were −3.6 ± 9.1 N. The 95% limits of agreement ranged from 234.0 to 1008.0 N for the CLS and −21.9 to 14.7 N for the WLS. During both the criterion standard and experimental trials, the CLS overestimated contact forces with larger variance than the WLS.

Conclusion: This novel method to predict spinal contact force combines direct and indirect measurements into a single framework and preserves clinically relevant practitioner-participant contacts. As advanced instrumentation becomes available, this framework will enable advancements in training and high-quality research on mechanisms of spinal manipulative therapy.  PubMed Record

This abstract is reproduced with the permission of the publisher. Click on the above link for free full text.


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