Shoulder pain and proprioception
Impaired proprioception is quite prevalent amongst people with shoulder pain. However, its relation with injury, as in other painful conditions, remains rather elusive. It is unclear whether deficits in proprioception is a result or a cause of injury and if and how are they affected by the presence of pain. Thus, the aim of the study was to investigate the effects of experimentally-induced sub-acromial pain on shoulder proprioception.
20 healthy subjects participated in this study. Measures of passive joint replication (PJR) and threshold to detection of movement direction (TTDMD) were assessed in three conditions; a control-baseline condition followed by the experimentally induced pain condition and the control-recovery condition.
The results showed a significant decrease for TTDMD for the experimental pain condition while no significant effect was found for PJR. The decrease in TTMD reflects an enhanced movement sense which might be the result of centrally driven protective mechanism. Where decreased proprioceptive sense is found in patients with shoulder disorders, these deficits may be due to tissue damage and neural adaptations that occur rather than the effects of acute pain.
> From: Sole et al., Man Ther 20 (2015) 166-170(Epub ahead of print). All rights reserved to Elsevier Ltd. Click here for the Pubmed summary.