Ossification, HeterotopicMyositis OssificansOssification of Posterior Longitudinal LigamentAnkylosisOsteogenesisTotal Disc ReplacementElbow JointLongitudinal LigamentsLigamentum FlavumFibrous Dysplasia, PolyostoticArthroplasty, Replacement, HipSpinal Cord InjuriesPubic SymphysisMaxillofacial AbnormalitiesGrowth PlateActivin Receptors, Type IElbowHipPseudopseudohypoparathyroidismCystostomyCartilageBone and BonesAcetabulumHip JointRange of Motion, ArticularPubic BoneGermany, WestFractures, BoneChondrocytesOsteoarthritis, HipFemur HeadGTP-Binding Protein alpha Subunits, GsPostoperative ComplicationsBone Morphogenetic Protein 2Bone DevelopmentEpiphysesParaplegiaIndomethacinAnti-Inflammatory Agents, Non-SteroidalFracture HealingArm InjuriesFracture Fixation, InternalOsteoblastsJoint ProsthesisDislocationsFemoracetabular ImpingementQuadriplegiaEtidronic AcidHip ProsthesisBone Morphogenetic ProteinsSkullAlkaline PhosphataseHyperostosis, Diffuse Idiopathic SkeletalCollagen Type XBone Morphogenetic Protein Receptors, Type ITomography, X-Ray ComputedGout SuppressantsChondrogenesisCalcification, PhysiologicTreatment OutcomeCranial SuturesLigamentsPostoperative CareOrthopedic ProceduresRetrospective StudiesCervical Vertebrae