EFFECTS OF HANDEDNESS ON CERVICAL SIDE FLEXION IN ADULTS

Hand dominance decides the involvement of extremities during activities of daily living therefore each side of the body undergoes different amounts of stress and load which leads to varying degenerative changes. When diagnosing musculoskeletal problems and tracking prognosis, range of motion (ROM) assessments are frequently used. Therefore, ROM is a helpful clinical indicator of tailored treatment plans. Current rehabilitation literature suggests to goal for equal ROM at the effected joint as contralateral side which may differs greatly based on the dominance of the extremity. The aim of the project is finding the average readings for cervical range of motion (CROM) for lateral flexion in left and right-hand dominant population respectively. Demographic details of 308 participants of both genders (age 18-28 years) were documented which were divided into two groups based on their hand dominance i.e. left and right, subjects were informed about the procedure after which the ranges for cervical lateral flexion on both sides were recorded in degrees using a single inclinometer method. The normative reference value of left cervical lateral flexion (LCLF) & right cervical lateral flexion (RCLF) of participants with right hand dominance which is stated in Mean ± SD. The LCLF & RCLF’s-mean and ranges are expressed to be 42.272 (26.00-62.00) & 47.344 (31.00-71.00) degrees respectively. To get the precise evaluation, the geometric mean (95%CI) was employed, which is as follows: 41.616 (41.088-43.457) & 46.641 (46.045-48.642). The normative reference value of LCLF & RCLF of participants with left hand dominance which is stated in Median (IQR). The LCLF & RCLF median and ranges are expressed to be 51.00 (32.00-70.00) & 47.00 (32.00-69.00) degrees respectively. To get the precise evaluation, the geometric mean (95%CI) was employed, which is as follows: 49.787 (49.175-51.421) & 47.866 (47.225-49.605). The research was effective in determining the normative reference value of cervical lateral flexion in subjects aged 18 to 28 with respect to hand dominance.利手（hand dominance）决定了日常生活活动中四肢的参与模式，因此身体两侧会承受不同程度的应力与负荷，进而引发程度各异的退行性改变。在诊断肌肉骨骼疾病与追踪预后时，关节活动度（range of motion, ROM）评估是常用临床手段，ROM因此成为定制化治疗方案的重要参考指标。当前康复医学研究提出，应将患侧关节的ROM恢复至与对侧一致的目标，但这一目标可能因四肢利手性的不同而存在显著差异。本研究旨在分别获取左利手与右利手群体的颈椎侧屈活动度（cervical range of motion, CROM）平均测量值。本研究共纳入308名18至28岁的男女受试者，记录其人口学特征，并根据利手分为左利手与右利手两组。受试者在充分知晓试验流程后，采用单倾角仪法以角度为单位记录双侧颈椎侧屈活动度。右利手受试者的左侧颈椎侧屈（left cervical lateral flexion, LCLF）与右侧颈椎侧屈（right cervical lateral flexion, RCLF）的参考正常值以均值±标准差（Mean ± SD）表示，其中LCLF与RCLF的均值及取值范围分别为42.272（26.00~62.00）度与47.344（31.00~71.00）度。为获得更精准的评估结果，本研究采用了几何均值（95%置信区间，95%CI），结果如下：LCLF为41.616（41.088~43.457），RCLF为46.641（46.045~48.642）。左利手受试者的LCLF与RCLF参考正常值以中位数（四分位距，interquartile range, IQR）表示，其中LCLF与RCLF的中位数及取值范围分别为51.00（32.00~70.00）度与47.00（32.00~69.00）度。为获得更精准的评估结果，本研究同样采用了几何均值（95%CI），结果如下：LCLF为49.787（49.175~51.421），RCLF为47.866（47.225~49.605）。本研究成功明确了18至28岁人群中，不同利手群体的颈椎侧屈活动度参考正常值。