Joint position sense is not altered during shoulder medial and lateral rotations in female assembly line workers with shoulder impingement syndrome

Abstract

This study evaluated joint position sense (JPS) during medial and lateral rotations of the shoulder in female workers with and without shoulder impingement syndrome (SIS). Three groups were assessed. The case group consisted of 15 female assembly line workers (35.5, SD 5.8 years) with unilateral SIS. Control group 1 consisted of 15 female assembly line workers asymptomatic for SIS (34.4, SD 5.5 years) and control group 2 consisted of 15 female subjects (33.1, SD 6.2 years) asymptomatic for SIS and with no exposure to activities with the upper limbs. The JPS was evaluated bilaterally during passive (2°/sec) and active (5°/sec) repositioning tests using an isokinetic dynamometer. The target angles were 45° of lateral rotation (achieved by medially rotating the shoulder from 90° of lateral rotation) and 75° of lateral rotation (achieved by laterally rotating the shoulder from neutral rotation). There were no differences between sides for all groups (p > 0.05). There were no differences in any of the variables between the case group and the control groups (p > 0.05). The results of this study suggest that JPS during medial and lateral rotations of the shoulder is not altered in female assembly line workers with SIS.

Patients with Subacromial Pain Syndrome Present no Reduction of Shoulder Proprioception: A Matched Case‐Control Study

“…Previous studies using the isokinetic dynamometer also reported no reduction in proprioception in women with SAPS 11 and people with experimentally induced subacromial pain. 10 Further studies should compare proprioception of the shoulder in a painful arc and asymptomatic motion of the patients with SAPS to clarify our hypothesis.…”

“…We conducted a randomization procedure for the proprioceptive evaluations to prevent learning bias by movement repetition. The same procedure was carried out in one study that did not find a reduction in proprioception for these patients . The comprehensive assessment of shoulder proprioception in patients with SAPS was carried out using an isokinetic dynamometer, which is a gold standard instrument for proprioception analysis.…”

“…The same procedure was carried out in one study that did not find a reduction in proprioception for these patients. 11 The comprehensive assessment of shoulder proprioception in patients with SAPS was carried out using an isokinetic dynamometer, which is a gold standard instrument for proprioception analysis. Furthermore, the number of participants in the current study is higher compared to previous studies investigating shoulder proprioception, which showed a median of 15 patients.…”

“…Clinical benefits (ie, improvement in range of motion, pain, kinesthesia, and function) were demonstrated with proprioceptive training after decompression surgery and conservative therapy in patients with SAPS . However, two previous studies that investigated shoulder proprioception in people with experimentally induced pain and workers with SAPS noted no reduction in proprioception. The lack of uniformity in the results of the proprioception acuity may be due to the recruitment of a small number of participants, the arm position used in the proprioception assessment, or the variety of the shoulder conditions among the participants.…”

“…9 However, two previous studies that investigated shoulder proprioception in people with experimentally induced pain 10 and workers with SAPS 11 noted no reduction in proprioception. The lack of uniformity in the results of the proprioception acuity may be due to the recruitment of a small number of participants, 7,11 the arm position used in the proprioception assessment, or the variety of the shoulder conditions among the participants. Knowledge of the proprioceptive deficit would assist clinicians in the proper treatment and may offer an alternative explanation for the mechanisms underlying SAPS, which are poorly understood.…”