Kinematic Axial Cervical Rotation Performance in Patients With Acute Non-specific Neck Pain During the DidRen Laser Test is Improved After Passive Manual Cervical Mobilizations Regardless of the Painful Spinal Level

At baseline, all participants will be asked to fill in four questionnaires.

• The Neck Disability Index (NDI), which is a self-rated instrument assessing disability due to neck pain, which consist of a series of 10 questions on activities relating to daily living all assessed on a 6-point scale.
• The Numerical Pain Rating Scale (NPRS), to assess the current neck pain.
• The Tampa scale of kinesiophobia (TSK), which is a 17-item questionnaire used to assess fear of movement or re-injury, in which participants are asked to rate their level of agreement with each item on a 1 (strongly disagree) to 4 (strongly agree) scale. The TSK has been shown to have adequate internal consistency (coefficient alpha 0.77) and to be associated with measures of behavioral avoidance and self-reported disability.A cut-off score above 39 is associated with a risk for prolonged pain-related disability.
• The French version of the Bournemouth Questionnaire based on the biopsychosocial model to evaluate different dimensions in neck pain participant including the pain, disability, affective and cognitive aspects of neck pain.

The investigators will assess the Fast Neck Rotation with the DidRen Test:

Also, clinical examination will include Cervical Rotation Testing, Manual Spinal Examination.

• The Didren laser test will be performed by the participant. During the DidRen Laser test, the kinematic rotation will be recorded using a validated Inertial Motion Unit (IMU). After the DidRen test, participant will rate their pain using the NPRS in order to assess if the pain intensity could interfere with the test performance.
• Measurements of cervical Rotation active range of motion (ROM) will be measured by an IMU. During active cervical ROM measurement participants will be asked to report any familiar pain on a Numerical Pain Rating Scale (NPRS). If no pain during active movement is reported, then the physiotherapist will passively move the head toward end of the ROM and note any stiffness and/or reported familiar pain from the participants. A positive cervical Rotation ROM test will be defined as the reproduction of stiffness and/or familiar cervical spine pain during the active ROM without or with over pressure.
• The Manual spinal examination will include Passive Physiological Intervertebral Movements (PPIVM's) in lateral flexion and extension and Passive Accessory Intervertebral Movements (PAIVM's), will be performed to detect the presence or absence of cervical joint dysfunction and to detect the region of the dysfunction either on the upper or lower region.The participant will be positioned supine for the PPIVM's and prone for the PAIVM's. For the PAIVM's, the assessor will apply centrally directed posterior-anterior (central P/A) force toward the spinous process or posterior-anterior directed force to the articular pillars (unilateral P/A) from the upper cervical region C0-1, C1-2 and C2-3 to the lower region C6-7 on each side. Any perceived resistance to passive motion will be recorded. The participant will be asked to report any familiar pain provocation on an NPRS. A positive test at a cervical level will be defined as a report of familiar local or referred pain when the assessor rate resistance to passive motion (Manual Spinal examination test have demonstrated moderate to excellent intrarater and interrater reliability in patients with axial neck pain referred for diagnostic facet joint blocks).