Abstract
ABSTRACT Purpose: To investigate the impact of shoulder subluxation (SS) on peripheral nerve conduction and function of the hemiplegic upper extremity (HUE) in poststroke patients. Methods: Thirty post-stroke patients were selected (SS group: 15 patients, non-SS group: 15 patients, respectively). Evaluation of nerve conduction in upper limbs: the compound muscle action potential (CMAP) amplitude and latency of suprascapular, axillary, musculocutaneous, radial, median, and ulnar nerves; the motor and sensory conduction velocity and the sensory nerve action potential (SNAP) amplitude of median, ulnar, and radial nerves. The Brunnstrom stage scale was used to evaluate the HUE motor function. Results: Compared with the healthy side, the CMAP and SNAP amplitudes of tested nerves on the HUE in both groups were lower, and the CMAP latency of the suprascapular, axillary and musculocutaneous nerves on the HUE in the SS group was longer (P < 0.05). Compared with the HUE in non-SS group, the CMAP amplitude of tested nerves (except ulnar) was decreased more (P < 0.05), the motor conduction velocity of the median nerve was lower (P < 0.05), and the Brunnstrom stage of the HUE was lower in SS group (P < 0.05). Conclusions: Stroke may lead to extensive abnormal nerve conduction on the HUE, and SS may aggravate the abnormality, which may disturb the recovery of upper limb function.
Highlights
After stroke, the peripheral nerves of the hemiplegic upper extremity (HUE) could exist impairments which seriously delay the function recovery of the HUE
The hemiplegic upper extremity (HUE) could be affected by muscle weakness, gravity traction, incorrect posture transfer, or peripheral nerve/rotator cuff injury, so the humeral head partially detaches from the glenoid, which leads to the shoulder subluxation (SS) [1, 3]
A total of 30 patients were selected and 15 patients with SS were allocated to the SS group, other 15 without SS were allocated to Non-shoulder subluxation group (N-SS group)
Summary
The peripheral nerves of the hemiplegic upper extremity (HUE) could exist impairments which seriously delay the function recovery of the HUE. The impacts of shoulder subluxation (SS) on the HUE electromyography characteristics in post-stroke are rarely reported. This study was to investigate the impact of SS on peripheral nerve conduction and function of the HUE in post-stroke patients. Electrodiagnosis and ultrasound medicine studies show that, in post-stroke patients, the peripheral nerves of the HUE could exist different degrees of impairment which seriously delays the function recovery of the HUE [6,7,8]. The impacts of SS on the HUE electroneurographic characteristics in post-stroke are rarely reported
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