Article

OBJECTIVE: To investigate the presence of primary and secondary hyperalgesia
among subjects with chronic subacromial impingement syndrome (SIS) compared with
pain-free controls. DESIGN: Cross-sectional design. SETTING: Outpatient
rehabilitation clinic, urban, academic medical center. PARTICIPANTS: Volunteer
sample (N=62) (31 with SIS, 31 controls).MAIN
OUTCOME MEASURES: Pressure-pain thresholds (PPTs) were measured at the middle
deltoid of the affected/dominant arm (primary or secondary hyperalgesia) and the
middle deltoid and tibialis anterior of the unaffected/nondominant side
(secondary hyperalgesia) in SIS and healthy controls, respectively. Differences
in PPTs were analyzed by Wilcoxon rank sum test and with linear regression
analysis controlling for sex, a known confounder of PPTs. RESULTS: After
adjusting for sex, subjects with SIS had significantly lower PPTs than did
controls at all locations. Controls had a 1.4 kg/cm(2) (95% confidence interval
[CI], 1.2-1.5) higher PPT at their affected shoulder than did those with SIS, a
0.7 kg/cm(2) (95% CI, 0.5-0.9) higher PPT at their nonaffected shoulder, and a
1.1 kg/cm(2) (95% CI, 1.1-1.2) higher PPT at their contralateral tibialis
anterior. Observers were not blinded to patient groupings but were blinded to the
level of applied pressure. CONCLUSIONS: This study provides further evidence that
patients with SIS have significantly lower PPTs than do controls in both local
and distal areas from their affected arm consistent with primary and secondary
hyperalgesia, respectively. Data suggest the presence of central sensitization
among subjects with chronic SIS.
CI - Copyright (c) 2012 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS