Quantification of lumbar function. Part 2: Sagittal plane trunk strength in chronic low-back pain patients

Spine (Phila Pa 1976). 1985 Oct;10(8):765-72.


A prototype sagittal plane trunk strength tester was used to measure trunk strength in 286 chronic low-back pain patients. Initial data for this patient group are compared with data acquired previously from a group of controls, adjusted for age, sex, and body weight. Distinct patterns characterize the patient sample as opposed to the controls: Patient values for both flexors and extensors were markedly decreased, with greater variability; Extensor strength was affected more significantly than flexor strength; Discrepancies between patients and controls were greater for females than for males; High-speed dropoff ratios were much lower for patients, both in flexion and extension. These results demonstrate that strength deficits are a major factor in the deconditioning syndrome associated with chronic low-back pain.

Publication types

  • Comparative Study

MeSH terms

  • Adult
  • Age Factors
  • Back Pain / physiopathology*
  • Body Weight
  • Female
  • Humans
  • Lumbosacral Region
  • Male
  • Middle Aged
  • Movement
  • Muscles / physiopathology*
  • Physiology / instrumentation
  • Sex Factors