Relation Between Near Point of Convergence and Postural Stability in Subjects With Non Specific Cervical Pain


A correlation study was conducted to correlate between the convergence insufficiency and postural stability at three different cervical positions in patients with non-specific cervical pain.

Study Type

  • Study Type: Observational
  • Study Design
    • Time Perspective: Cross-Sectional
  • Study Primary Completion Date: January 20, 2019

Detailed Description

A correlational study was conducted on eighty (male and female) subjects aged between 30-40 years old, presented with chronic NSCP persisted for six months or more, with neck disability index score (NDI) ≥10%, and can possess at least 45° of left and right cervical rotation participated in the study. Convergence insufficiency was evaluated by the near point of conversion (NPOC) rule and postural instability was examined by the Biodex balance system. RESULTS: There was significant positive correlation between (NPOC) and anteroposterior stability index (APSI) at the three cervical positions; neutral, 45° right torsion and 45° left torsion (P>0.05).

Clinical Trial Outcome Measures

Primary Measures

  • Stability index
    • Time Frame: during the procedure
    • Antero-posterior and mediolateral stability index
  • The near point of convergence (NPOC)
    • Time Frame: during the procedure
    • The near point of convergence (NPOC) measured by NPOC rule
  • The CROM
    • Time Frame: during the procedure
    • cervical flexion, extension, rotation and lateral flexion

Participating in This Clinical Trial

Inclusion Criteria

Age from 30 to 40 years, Chronic cervical pain ( 6 to18 months ago) Neck Disability Index (NDI) score ≥10%), Can possess at least 45° of cervical rotation to both the left and right. Exclusion Criteria:

Neuromuscular or musculoskeletal disorders

Gender Eligibility: All

Minimum Age: 30 Years

Maximum Age: 40 Years

Investigator Details

  • Lead Sponsor
    • Cairo University
  • Provider of Information About this Clinical Study
    • Principal Investigator: Amina Awad,PhD, Lecturer – Cairo University
  • Overall Official(s)
    • Wael Shendy, PhD, Study Director, Cairo University

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