results the results showed that the highest compressive force exerted on the back was equal to 4002 n and the lowest force 1425 n. moreover, 76% of the tasks were reported to have the highest compressive force greater than the recommended limit; 72% of the tasks had an li 1 - 3 and 28% of them had an li less than 1. there was a weak direct correlation between compressive force and rwl. backgrou...

The advantages and disadvantages of different methods of carrying objects on spine loading are still not fully understood. Previous studies have either examined the effects of carrying using physiological measures or examined isolated spine segments using biomechanical models. Additionally, most studies have been restricted to only a small number of carrying conditions. Very few studies have at...

As the nature of many materials handling tasks have begun to change from lifting to pushing and pulling, it is important that one understands the biomechanical nature of the risk to which the lumbar spine is exposed. Most previous assessments of push-pull tasks have employed models that may not be sensitive enough to consider the effects of the antagonistic cocontraction occurring during comple...

the purpose of this historical review is to summarize the work of paul of aegina and especially his contribution to the treatment of spine disorders and trauma. a major review of the literature was undertaken with emphasis on the treatise of paul himself as well as those of later scholars and historians. paul expanded the horizons of surgery of his time, using his talent to perform very complic...

OBJECTIVE To quantify the dynamic loads and intervertebral motions throughout the cervical spine during simulated rear impacts. METHODS Using a biofidelic whole cervical spine model with muscle force replication and surrogate head and bench-top mini-sled, impacts were simulated at 3.5, 5, 6.5, and 8 g horizontal accelerations of the T1 vertebra. Inverse dynamics was used to calculate the dyna...

The spine is a long and slender column which supports the upper body. In the 1960s, the compressive force acting on the spine estimated by the intradiscal pressure measured in vivo was found to exceed 2600N. However the ligamentous lumbar spine is known to be unstable when subjected to compressive loads of 88 N. It is generally agreed that the ligamentous spine itself is unstable but can be sta...

While heavy lifting has been identified as an important risk factor for low back disorders, little is known about workplace spatial layout - the relative positions of shelves and the impact of this on spine loads. The objective of the current study was to investigate how the relative positions of the load origin and destination impact three-dimensional spine loads. Seven females and seven males...

Patient handling continues to represent a high risk task for low back pain (LBP) among health caregivers. Previous studies indicated that manual transfers of patients impose unacceptable loads on the spine even when two caregivers perform the transfer. Patient lift devices are considered a potential intervention; however, few biomechanical analyses have investigated the spine loads and LBP risk...

STUDY DESIGN The impact of various levels of mental processing and pacing (during lifting) on spine loading was monitored under laboratory conditions. OBJECTIVES To explore how mental demands and pacing influence the biomechanical response and subsequent spine loading and, to determine whether individual characteristics have a modifying role in the responses. SUMMARY OF BACKGROUND DATA Mode...

BACKGROUND Low back loading and risk associated with pushing activities have been poorly understood. Previous studies have demonstrated that increases in anterior/posterior shear forces are primarily initiated by antagonistic coactivity within the torso. Yet, few studies have considered the range of activities that might contribute to the antagonistic coactivation and subsequent spine loading. ...