Forces generated during spinal manipulative therapy of the cervical spine: a pilot study

Area of Science:

• Biomechanics
• Spinal Manipulative Therapy (SMT)
• Cervical Spine Research

Background:

• Spinal Manipulative Therapy (SMT) is a common treatment for spinal conditions.
• Understanding the forces applied during SMT is crucial for safety and efficacy.
• Previous force measurements often relied on indirect methods, limiting accuracy.

Purpose of the Study:

• To quantify the forces imparted to the cervical spine during SMT using direct sampling.
• To measure both peak forces and the duration of force application.
• To compare direct force measurements with existing indirect data.

Main Methods:

• A quantitative study was conducted in a Human Performance Laboratory.
• Two doctor/patient pairs participated, with patients selected by their chiropractors.
• SMT (toggle method) was applied to the cervical spine over a 2-week period, with tissue compliance assessed before and after treatment.

Main Results:

• The mean peak force applied during SMT was 117.7 N (±15.6 N).
• The mean duration of force application was 101.7 milliseconds (±14.7 msec).
• Direct force measurements were obtained for preload and peak forces, as well as force duration.

Conclusions:

• Direct sampling methods provide reliable force measurements for cervical SMT.
• The force duration times measured directly are shorter (faster) than those reported by indirect techniques.
• These findings enhance our understanding of the biomechanical forces involved in SMT.