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Investigating the effect of addition of cervical proprioceptive training to conventional physiotherapy on visual, vestibular and proprioceptive dependency of postural control in patients with chronic non-specific neck pain: a randomized controlled clinical trial
Goudarzi L, Ghomashchi H, Vahedi M, Kahlaee AH
The Archives of Bone and Joint Surgery 2024;12(1):36-50
clinical trial
8/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: Yes; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: Yes; Adequate follow-up: Yes; Intention-to-treat analysis: Yes; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

OBJECTIVES: While cervical proprioception deficit has been suggested as a contributing factor to clinical consequences of chronic non-specific neck pain (CNSNP), the effect of addressing such impairments on postural control strategies has remained unexplored. The aim of this study was to compare the response of the postural control system to alteration of sensory afferents in CNSNP with asymptomatic individuals. Furthermore, we examined whether proprioceptive training would yield superior outcomes to routine physiotherapy for improvement of postural control, pain and disability. METHODS: Center of pressure (CoP) variables of sixty CNSNP patients equally distributed in any of the proprioception-specific or conventional physiotherapy groups and 30 asymptomatic participants were evaluated under four standing conditions: (1) normal, (2) foam, (3) cervical extension/eyes open and (4) cervical extension/eyes closed standing. RESULTS: CoP anteroposterior range and anteroposterior and mediolateral velocity in patients were significantly higher than the control group under condition 2 (p < 0.05). Patients also demonstrated lower anteroposterior lyapunov exponent under conditions 2 and 4 (p < 0.05). Both interventions significantly decreased anteroposterior range and anteroposterior velocity (p < 0.05). Anteroposterior lyapunov exponent also increased under condition 2 (p < 0.05).. After the interventions, CoP anteroposterior range and anteroposterior velocity were significantly lower in the proprioceptive exercise group than the conventional physiotherapy group (p < 0.05). Anteroposterior lyapunov exponent was also significantly higher in the proprioceptive exercise group (p < 0.05). This while there was no significant difference between these patients and control group participants in any of the CoP variables after intervention. CONCLUSIONS: Our results rejected the hypothesis that impaired neck proprioception in the presence of CNSNP is compensated by overweighting other sources of sensory afferent information. The findings also revealed that while proprioceptive exercises successfully returned postural strategies of CNSNP patients to those in asymptomatic participants, they do not add to clinical recovery of these patients.

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