Analysis of carpet weaver's posture in Tabriz by photogrammetry method: A pilot study

Abstract

According to studies, there is a close relationship between ergonomic risk factors and work habits with musculoskeletal pain and body posture. Posture and sitting position of people in the workplace during long-term work activities plays a role in changing and shaping the posture of different parts of the body. The aim of this study is to the analysis of carpet weaver's posture in Tabriz by photogrammetry method. Materials and Methods: In this cross-sectional study, 55 carpet weavers who had informed consent were selected by available methods from patients referred to the Physical Medicine and Rehabilitation Clinic with musculoskeletal pain in 2018, and referred to the Physical Medicine Research Center for posture and BMI analysis. In this place, using a non-invasive photogrammetric posture measuring device, 3 photographs were taken with a digital camera from the front, back and side of the patient in a standing position, from the cervical, thoracic and lumbosacral spines. After imaging, the software analyzed and measured the postural angles using landmarks on the body. At the end, the patients' data were analyzed and, if any, the patient's postural dysfunction was identified. Data were analyzed using SPSS software version 26 and Pearson correlation test. Results: In this study, the mean (standard deviation) age of the subjects was 48.85 (±10.5) years. None of the variables of carpet weavers' posture were normal. The highest posture of Tragus-Plumb Line D in 54 cases (98.2%) were Forward Head. The highest posture of Acromion-Plumb Line D in 52 cases (94.5%) were Protracted. In posture of Pelvic Tilt A, most carpet weavers with 53 cases (96.4%) had an Anterior deviation. In posture of Trunk Sway A, most carpet weavers with 29 cases (52.7%) deviated to the Posterior. The highest posture of Body Sway A in 53 cases (96.4%) were Anterior Displacement. In posture of Hip-Plumb Line D in carpet weavers, all 55 cases (0.100%) had an Anterior deviation. The highest posture of Lateral Knee A in 40 cases (72.7%) were Flexion. Finally, In posture of Knee-Plumb Line D, most carpet weavers with 54 (98.2%) deviated to the Anterior. Among the posture variables in the subjects, except Knee-Plumb Line D, which was directly correlated with body mass index, other variables such as: Head Horizontal A, Tragus-Plumb Line D, Lumbar Lordosis A and Hip-Plumb Line D was inversely correlated with body mass index; Of course, there was no statistically significant correlation between all these variables and body mass index (P-value> 0.05).