An interventional study of Prismatic low-powered lenses in Postural Neck Pain, Postural Imbalance and Postural Disorders, sponsored by Lisbon Academic Medical Center - Centro Académico de Medicina de Lisboa. Recruiting at 1 site in Portugal. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-04-16.
Sponsored by Lisbon Academic Medical Center - Centro Académico de Medicina de Lisboa · Not applicable, Interventional, and Basic science
This study aims to investigate the short-term modifications in head and neck positioning by usage of low-powered prismatic lenses in patients with Postural Deficiency Syndrome (PDS). A matched pair observation study was designed. Evaluation is carried out using low dose biplanar radiography before treatment and 15 minutes after lenses application.
1,360 studies on the registry are indexed under Neck Pain; 299 are open to participants now.
This study's planned enrollment of 20 is below the median of 50 across 1,116 interventional studies indexed under Neck Pain.
Browse Neck Pain studies →Lisbon Academic Medical Center - Centro Académico de Medicina de Lisboa is the lead sponsor of 4 studies on the registry; 4 are open to participants now.
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Presentation of diagnostic criteria for Postural Deficiency Syndrome comprising of
Exclusion Criteria:
Device: Prismatic low-powered lenses
Participants perform biplanar X-ray before and after lens application
Radiographic modification of pelvic tilt angle
Changes in pelvic tilt angle are measured between two subsequent radiographic biplanar scans in standing position, before and after lenses application on the same patient. Measurement is performed in degrees using the radiographic equipment proprietary software (EOS imaging). A minimum clinical significance value of 3 degrees was estimated.
Time frame: From enrollment to second radiographic evaluation on day 1
Radiographic modification of C0 inclination
Changes in C0 inclination angle are measured between two subsequent radiographic biplanar scans in standing position, before and after lenses application on the same patient. Measurement is performed in degrees using the radiographic equipment proprietary software (EOS imaging). A minimum clinical significance value of 3 degrees was estimated.
Time frame: From enrollment to second radiographic evaluation at day 1
Radiographic modification of cervical spinal vertical alignment
Changes of cervical spinal vertical alignment are measured between two subsequent radiographic biplanar scans in standing position, before and after lenses application on the same patient. Measurement is performed in millimeters using the radiographic equipment proprietary software (EOS imaging). A minimum clinical significance value of 2 millimeters was estimated.
Time frame: From enrollment to second radiographic evaluation at day 1
Radiographic modification of cervical lordosis
Changes of cervical lordosis angle are measured between two subsequent radiographic biplanar scans in standing position, before and after lenses application on the same patient. Measurement is performed in degrees using the radiographic equipment proprietary software (EOS imaging).
Time frame: From enrollment to second radiographic evaluation at day 1
Radiographic modification of inclination of C1
Changes of C1 inclination angle are measured between two subsequent radiographic biplanar scans in standing position, before and after lenses application on the same patient. Measurement is performed in degrees using the radiographic equipment proprietary software (EOS imaging).
Time frame: From enrollment to second radiographic evaluation at day 1
Radiographic modification of inclination of C2
Changes of C2 inclination angle are measured between two subsequent radiographic biplanar scans in standing position, before and after lenses application on the same patient. Measurement is performed in degrees using the radiographic equipment proprietary software (EOS imaging).
Time frame: From enrollment to second radiographic evaluation at day 1
Radiographic modification of global spinal vertical alignment
Changes of global spinal vertical alignment are measured between two subsequent radiographic biplanar scans in standing position, before and after lenses application on the same patient. Measurement is performed in millimeters using the radiographic equipment proprietary software (EOS imaging).
Time frame: From enrollment to second radiographic evaluation at day 1
PDFs hosted by the registry, ClinicalTrials.gov.
Plan to share: Yes — All measurements performed from imaging studies
Supporting information: Study protocol, Statistical analysis plan, Informed consent form, Analytic code
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Lisbon Academic Medical Center - Centro Académico de Medicina de Lisboa