Rahmatalla S, et al. - Authors analyzed 16 healthy male candidates with prospective simulator study to compare the relative efficiency of immobilization systems in restricting involuntary movements of the cervical spine using a dynamic simulation model. They tested immobilization configurations as cot alone, cot with a cervical collar, long spine board (LSB) with a cervical collar and head blocks, and vacuum mattress (VM) with a cervical collar and quantitated involuntary cervical rotation, flexion/extension, and lateral bend with a motion capture technology. They observed the LSB and the VM more efficient in checking cervical movement than the cervical collar and consequently, the LSB found more helpful in reducing repetitive and acute movements than the VM under some conditions.