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NCT Number: NCT07444944

Neck Disability and Temporomandibular Disorders

This cross-sectional study investigates neck-related disability in individuals with chronic neck pain by examining the combined influence of temporomandibular disorders, sleep quality, and cervical sensorimotor function within a single analytical model. Although these factors have previously been investigated separately, their combined contribution to disability has not been sufficiently explored. By integrating these clinical variables within one framework, our study aims to provide a multidimensional clinical perspective relevant to assessment and rehabilitation planning in musculoskeletal practice. Given the increasing clinical recognition of the interaction between temporomandibular and cervical systems, this study may help clinicians better understand multidimensional contributors to disability in chronic neck pain.

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Key information

Conditions

Neck Disability Craniomandibular Disorders Jaw Diseases Joint Diseases Mandibular Diseases Muscular Diseases Musculoskeletal Diseases Neck Pain Neurologic Manifestations Pain Pathological Conditions, Signs and Symptoms Signs and Symptoms Stomatognathic Diseases Temporomandibular Disorders (TMD) Temporomandibular Joint Disorders

Age range

18 year–55 year

Sex eligibility

All sexes

Study type

Observational

Primary location

Istanbul Medipol University

Istanbul, Turkey (Türkiye)

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Participants aged between 18 and 55 years
  • non-specific neck pain lasting for at least three months
  • participants who were able to read and write in Turkish

Exclusion criteria

  • Individuals with a history of cervical surgery,
  • neck trauma within the previous year,
  • neurological or rheumatological disorders,
  • cervical radiculopathy,
  • inability to discontinue analgesic medication within 48 hours prior to assessment,
  • pregnancy,
  • cognitive impairment

Treatment and study plan

Primary outcomes

  1. neck disability

    Time frame: Primary outcome (NDI) was measured once at baseline during the cross-sectional assessment.

    Neck disability was evaluated by The Neck Disability Index (NDI) total score

    The NDI consists of 10 questions in total, and each question evaluates a different area of daily life. Each question is scored between 0 and 5 points:

    0 = no problem at all, 5 = maximum limitation. The total score range can be: Minimum: 0 and Maximum: 50.

Secondary outcomes

  1. Sleep quality

    Time frame: at baseline

    Sleep quality was assessed using the Pittsburgh Sleep Quality Index (PSQI). The sleep-related assessment consists of 7 components, each scored between 0 and 3: 0 = no problem and 3 = serious problem. The total score can range from a minimum of 0 to a maximum of 21. As the score increases, sleep quality deteriorates: ≤5 good sleep quality and >5 poor sleep quality.

Other outcomes

  1. Cervical Proprioception, Deep Neck Flexor Endurance, and Posture

    Time frame: at baseline

    Cervical proprioception was assessed using the joint position error (JPE) test. Participants were seated in an upright position with a laser pointer securely attached to the head. A target point was marked on a wall at eye level to represent the neutral head position. With their eyes closed, participants were instructed to actively move their head into flexion, extension, and right and left rotation, and then return to the initial neutral position. The deviation of the laser point from the target was recorded for each movement direction. Absolute error values were calculated and expressed in degrees (°). The mean of the absolute errors obtained from the four movement directions was used for statistical analysis, with higher values indicating poorer cervical proprioceptive accuracy.

  2. Deep neck flexor muscle endurance

    Time frame: at baseline

    Deep neck flexor muscle endurance was assessed using the craniocervical flexion test protocol. Participants were positioned supine with knees flexed and instructed to perform a gentle craniocervical flexion (chin tuck) without lifting the head from the surface. The position was maintained isometrically, and the duration for which the participant could sustain the correct posture without compensation was recorded. Test duration was measured in seconds. Higher values indicate greater deep neck flexor muscle endurance.

    Unit of Measure: Seconds

Sponsors and collaborators

Lead sponsor

Istanbul Medipol University Hospital

Other

Registry information

Official study title

Neck Disability in Chronic Neck Pain: Associations With Temporomandibular Disorders, Sleep Quality, and Cervical Sensorimotor Function

Important dates

Study start
2026
Primary completion
2026
Study completion
2026
First posted
Mar 3, 2026
Registry last updated
Mar 3, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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