Assessment of Cervical Resting Posture among Apparently Healthy Individuals Using an Adapted Linear Excursion Measurement Device

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Posture is defined as the relationship between a segment and part of the body related to other adjacent segments; and the relationship between all the segments of the human body [1]. It is an indicator of biomechanical efficacy, equilibrium, and neuromuscular coordination [2]. The biomechanical ideal configuration for the human cervical spine is characterised by a posterior concave arc or lordosis [3]. Incorrect posture characterized by loss or reversal of the normal cervical lordosis, has been associated with chronic musculoskeletal pain in a number of studies [4-6]. The cervical spine acts as the junction between the head and the trunk. Skeletal mal-alignment or changes in alignment may indicate muscle lengthening or shortening, and strength imbalances between muscular agonists and antagonists [7]. Excessive or abnormal muscle tension, required when abnormal postures are maintained over time, can lead to muscle spasm and pain [8,9]. University students seem to be a high risk group for neck pain [10]. In addition to the factors predisposing to pain in the general population, students subject themselves to hours of prolonged reading, [10,11] writing and computer work [12] which make them high-risk group for neck pain due to the relatively poor posture adopted during these activities [11]. A method of objectively assessing cervical resting posture and defining poor posture has been reported by Grimmer [13-15], who developed the Linear Excursion Measurement Device. In this study, an adaptation of this instrument was used to assess and ascertain the risk of developing neck pain among students and the need for greater awareness of proper ergonomics with a view to reducing the likelihood of developing cervical postural problems. It is clear that there is a need for reliable methods to objectively assess neutral posture of head and neck. Several studies have shown that maintaining a poor cervical resting posture over time is a risk factor for predisposition to development of neck pain. Poor head posture is considered to be inefficient, increasing the antigravity load on cervical structures, instigating abnormal and compensatory activities by them, and resulting in pain. This poor posture is characterized by extremely large and/or extremely small cervical excursion angles at both the upper and lower cervical region, measured using the linear excursion measuring device as noted by Grimmer [13-15].