Biomechanical properties of the glenohumeral joint capsule in hemiplegic shoulder pain.
Hemiplegic shoulder pain (HSP) is one of the most common complications in stroke patients: its prevalence in this population is 38% to 84%. HSP is reported to be strongly related to the increase in hospitalization of these patients and their prognosis with respect to upper extremity function. It is of note that HSP had a significant association with limited range of external rotation, which is thought to be distinctive of Adhesive Capsulitis (AC) in the general population.
It’s not fully established whether the pathologic biomechanics are same in hemiplegic shoulder pain and adhesive capsulitis. Therefore this study aimed to investigate biomechanical properties of glenohumeral joint capsules of hemiplegic shoulder pain with limited range of motions.
The stiffness of the glenohumeral capsules in HSP patients was higher than that in the controle subjects, but lower than that in the AC patients with similar ROM limitations. This ﬁnding suggests that HSP with multidirectional ROM limitations have stiffer capsules as AC patients do although the severities are different. This ﬁnding implicates that hemiplegic shoulder pain may share common pathologic properties of tighter capsules with AC, but other mechanisms related with hemiplegia appear to be involved as well. Further researches are required to answer how the stiffer capsules of HSP should be treated and what other mechanisms are involved > from Yi et al.; Clinical Biomechanics (2013) Article in Press. All rights reserved to Elsevier Ltd.
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