Ergonomic Assessment of Risk Factors for Musculoskeletal Disorder in Selected Auto repair Shops

Abstract

This study assessed risk factors for musculoskeletal disorder in auto repair shop by analyzing and assessing typical auto mechanic daily  tasks using ergonomic assessment tools with consideration to risk factors such as awkward postures, high hand force and repetitive  motion. Questionnaire and physical measurements were employed for data collection from 11 auto mechanics, ages ranging between 15 to 51 years. Video camera was used to take snap shots of auto mechanics while working while video footages were used to aid the  development of hierarchical task analysis diagram. A rapid upper limb assessment of the subjects for 23 auto mechanic tasks was  conducted. The height and weight of subject including the weights of objects were  inputted to the 3 Dimensional Static Strength Prediction Program for low back compression analysis. Results showed that 19 tasks of the 23 tasks assessed had very high risk ratings of 7. Lifting tasks 4, 6, 8 and 10 violated ergonomic criteria for all modeled postures. Extreme stoop lift posture yielded the highest low back   compression forces increasing risks for low back pain. This work has shown that auto mechanics are at risk of Musculoskeletal Disorder, and low back compression analysis violated ergonomic criteria thus making auto mechanics are susceptible to low back pain. There is need to ergonomically redesign the work process and system to prevent the situation getting worse.