Low Back PainBack PainBack InjuriesMusculoskeletal DiseasesBackLumbar VertebraeHuman EngineeringMusculoskeletal SystemMusculoskeletal PainNeck PainAcute PainMucinosesOccupational DiseasesSpasmSacroiliac JointTriamcinoloneChronic PainPain MeasurementSacrumIntervertebral Disc DisplacementLumbosacral RegionRadiculopathySpondylosisIntervertebral Disc DegenerationLaminectomyIntervertebral DiscDiskectomySportsPostureOccupational HealthQuestionnairesPrevalenceDisability EvaluationPainChronic DiseaseEquipment DesignRisk FactorsMagnetic Resonance ImagingCross-Sectional StudiesFollow-Up StudiesTime FactorsRetrospective StudiesTreatment OutcomeFailed Back Surgery SyndromeLiftingPhysical Therapy ModalitiesChiropracticSpinal DiseasesManipulation, SpinalSpineBack MusclesExercise TherapySick LeaveZygapophyseal JointManipulation, ChiropracticBiomechanical PhenomenaAbsenteeismProspective Studies