TY - JOUR
T1 - The cervical flexion-relaxation ratio : reproducibility and comparison between chronic neck pain patients and controls
AU - Murphy, Bernadette A.
AU - Marshall, Paul W.
AU - Taylor, Heidi Haavik
PY - 2010
Y1 - 2010
N2 - AB Study Design. Reliability study. Objective. To determine the reproducibility of the cervical flexion-relaxation ratio (FRR) measured 4 weeks apart in a group of chronic neck pain patients and healthy control group and to compare the FRR between the 2 groups. Summary of Background Data. The cervical FRR measures the ability of the neck extensor muscles to relax during forward flexion, similar to the lumbar FRR. Its reliability and ability to discriminate neck pain patients from controls has not been investigated. Methods. Fourteen participants with chronic neck pain and a control group of 14 individuals with no neck pain were recruited via advertisement and word of mouth. The cervical FRR was determined at baseline and 4 weeks later using standardized electromyographic data collection and analysis procedures. Results. The mean FRR value for the combined left and right side data for the neck pain groups was 1.93 +/- 0.8, and 1.73 +/- 0.61 at 4-week follow-up. The intraclass correlation coefficient (ICC) was 0.83 (95% CI = 0.67-0.92). Three participants in the control group developed neck pain in the 4 weeks and their data were not included in the reliability calculation. For the control group, the combined (left and right side) mean FRR value was 4.09 +/- 1.58 at baseline and 4.27 +/- 1.71 on retest 4 weeks later. The ICC (intraclass r) was 0.89 (95% confidence interval = 0.76-0.95). The overall ICC for the combined groups was 0.92 (95% confidence interval = 0.86-0.95). An independent 2 group t test revealed a significant difference in the baseline FRR data between the control group and the neck pain group (P < 0.001). Conclusion. The cervical extensor muscles exhibit a consistent flexion-relaxation phenomenon in healthy control subjects and the measurement is highly reproducible when measured 4 weeks apart in both controls and chronic neck pain patients. The FRR in neck pain patients is significantly higher than in control subjects suggesting that this measure may be a useful marker of altered neuromuscular function.
AB - AB Study Design. Reliability study. Objective. To determine the reproducibility of the cervical flexion-relaxation ratio (FRR) measured 4 weeks apart in a group of chronic neck pain patients and healthy control group and to compare the FRR between the 2 groups. Summary of Background Data. The cervical FRR measures the ability of the neck extensor muscles to relax during forward flexion, similar to the lumbar FRR. Its reliability and ability to discriminate neck pain patients from controls has not been investigated. Methods. Fourteen participants with chronic neck pain and a control group of 14 individuals with no neck pain were recruited via advertisement and word of mouth. The cervical FRR was determined at baseline and 4 weeks later using standardized electromyographic data collection and analysis procedures. Results. The mean FRR value for the combined left and right side data for the neck pain groups was 1.93 +/- 0.8, and 1.73 +/- 0.61 at 4-week follow-up. The intraclass correlation coefficient (ICC) was 0.83 (95% CI = 0.67-0.92). Three participants in the control group developed neck pain in the 4 weeks and their data were not included in the reliability calculation. For the control group, the combined (left and right side) mean FRR value was 4.09 +/- 1.58 at baseline and 4.27 +/- 1.71 on retest 4 weeks later. The ICC (intraclass r) was 0.89 (95% confidence interval = 0.76-0.95). The overall ICC for the combined groups was 0.92 (95% confidence interval = 0.86-0.95). An independent 2 group t test revealed a significant difference in the baseline FRR data between the control group and the neck pain group (P < 0.001). Conclusion. The cervical extensor muscles exhibit a consistent flexion-relaxation phenomenon in healthy control subjects and the measurement is highly reproducible when measured 4 weeks apart in both controls and chronic neck pain patients. The FRR in neck pain patients is significantly higher than in control subjects suggesting that this measure may be a useful marker of altered neuromuscular function.
KW - cervical flexion, relaxation ratio
KW - chronic pain
KW - electromyography
KW - neck pain
UR - http://handle.uws.edu.au:8081/1959.7/550552
UR - http://ovidsp.ovid.com/ovidweb.cgi?T=JS&CSC=Y&NEWS=N&PAGE=fulltext&D=ovft&AN=00007632-201011150-00002&PDF=y
U2 - 10.1097/BRS.0b013e3181cbc7d8
DO - 10.1097/BRS.0b013e3181cbc7d8
M3 - Article
SN - 0362-2436
VL - 35
SP - 2103
EP - 2108
JO - Spine
JF - Spine
IS - 24
ER -