Effects of School Backpacks on Spine Biomechanics During Daily Activities: A Narrative Review of Literature

Abstract

Objective: The purpose of this narrative review is to summarize the effects of carrying school backpacks on spine and low-back biomechanics as a risk factor for low back pain in young individuals. Background: Backpacks constitute a considerable daily load for schoolchildren. Consistently, a large number of children attribute their low back pain experience to backpack use. Method: A literature search was conducted using a combination of keywords related to the impact of carrying backpacks on lower back biomechanics. The references of each identified study were further investigated to identify additional studies. Results: Twenty-two studies met inclusion criteria. A total of 1,159 people aged 7 to 27 years were included in the studies. The added load of a backpack and the changes in spinal posture when carrying a backpack impose considerable demand on internal tissues and likely result in considerable spinal loads. The findings included results related to the effects of backpack weight and position on trunk kinematics and spine posture as well as trunk muscle activity during upright standing, walking, and ascending and descending stairs. Conclusion: Backpack-induced changes in trunk kinematics for a given activity reflect alterations in mechanical demand of the activity on the lower back that should be balanced internally by the active and passive responses of lower back tissues. Although the reported alterations in trunk muscle activities and lumbar posture are indications of changes in the active and passive response of the lower back tissues, the resultant effects on spinal load, that is, an important causal factor for low back pain, remains to be investigated in the future. A knowledge of backpack-induced changes in spinal loads can inform design of interventions aimed at reduction of spinal load via improved backpack design or limitation on carrying duration. Application: This narrative review is intended to serve as an educational article for students and trainees in ergonomics and occupational biomechanics.

Assessment of Postural Changes Among School-Going Children Due to Heavy Backpacks in Lahore

“…According to results in this study, most parts of body showed good postural balance but some areas as trunk which showed fair postural balance, 46.2 % were fair and 10.3% were poor and 43.4 % good, these results indicating that heavy backpacks alter the mechanics of trunk curvature that's why scoliosis is very common in children. According to a study postural deviations and load on spine can be prevented by reducing weight of bag packs and the duration of wearing the bags [15]. Similar to the current study other studies finds that with variation in the weight of bags after one schooling year changes were found in the postures especially in parameters of rotation.…”

Einfluss des Schulrucksackgewichtes bei Grundschulkindern: Gang, Muskelaktivität, Haltung und Stabilität

“…Obwohl das Thema des Tragens eines Schulrucksacks seit langem von wissenschaftlichem Interesse ist und die Traglast biomechanische Anpassungen in Rücken und Körperhaltung bewirkt [ 17 ], konnte eine Kausalität für das Auftreten von Rückenschmerzen bisher nicht eindeutig belegt werden [ 32 , 34 ].…”

Distribution and imaging characteristics of spina bifida occulta in young people with low back pain

“…The extra load caused by backpacks and the posture of carrying backpacks may cause considerable spine load. Moreover, the mechanical demand on the lower back caused by the trunk movement caused by backpacks increases, which needs to be balanced by active and passive responses of the lumbar tissue [28] .…”