Mobile touch screen devices (MTSDs) have become an integral part of our daily lives; the time we spend using them is increasing. As children using them from a younger, formative age it might have a greater negative impact on their development. The objective of this thesis is to identify the impact of mobile device usage on school aged children and create a guidebook for physiotherapy students who might do their practice in an elementary school if the possibility opens for them in the future.

After defining a research question, the basis for theory was collected. Focusing on differences between paediatric and adult musculoskeletal systems, changes of physiological growth, atypical development, assessing children’s posture, biomechanics of MTSD use and how it affects posture, and how to support healthy development. Relevant studies about the postural effects of MTSD use were found with Google Scholar and PubMed.

Studies found connection between excessive MTSD use and musculoskeletal discomfort or pain in the neck or shoulder area. However, there is a need for further studies in the topic, especially with longitudinal design because there are only a few studies focusing on this age group.