Gregory Roytman, DC, PhD
Associate Research ScientistAbout
Research
Publications
2026
Influence of soft tissue composition and arm diameter on fracture strain in simulated humeral shaft fractures undergoing functional bracing
Lee A, Roytman G, Reuter A, Becker N, Tommasini S, Wiznia D, Fram B. Influence of soft tissue composition and arm diameter on fracture strain in simulated humeral shaft fractures undergoing functional bracing. Injury 2026, 57: 113276. PMID: 41967152, DOI: 10.1016/j.injury.2026.113276.Peer-Reviewed Original ResearchHumeral shaft fracturesFinite element analysisFunctional bracingShaft fracturesFEA modelFinite element analysis findingsFracture siteCadaveric biomechanical testingNon-operative treatmentArm diameterStrain valuesArm sizeAdiposity levelsBiomechanical testingConcentric cylindrical tubesSoft tissue characteristicsSoft tissue compositionBrace designBrace treatmentPatient selectionCadaveric armsFracture strainPlastic braceLevels of strainLateral forceDoes Soft Tissue Envelope Affect Rates of Union in Functional Brace Treatment of Humeral Shaft Fractures?
Maloy G, Kebeh M, Schneble C, Roytman G, Stockwell E, Fram B. Does Soft Tissue Envelope Affect Rates of Union in Functional Brace Treatment of Humeral Shaft Fractures? Journal Of Orthopaedic Trauma 2026, 40: 189-195. PMID: 41218156, DOI: 10.1097/bot.0000000000003121.Peer-Reviewed Original ResearchHumeral shaft fracturesBody mass indexBrace treatmentNonoperative managementShaft fracturesTreatment of humeral shaft fracturesSix-week follow-up visitFailure of nonoperative managementAssociated with nonunionSoft tissue measurementsFollow-up visitProgression to unionTime pointsPost-reduction radiographsRate of unionSoft tissue thicknessCurrent smoking statusAssociated with ageWeeks post-injuryDeltoid tuberositySoft tissue envelopeMedian ageAO/OTA classificationFracture site motionFunctional bracingDigitalization of the Modified Physical Performance Test
Grosek W, Roytman G, Kim Y, Wiznia D, Wilen L, Morgado-Vega N, Tommasini S, Garza-Rice J, Aslam R. Digitalization of the Modified Physical Performance Test. Journal Of Engineering And Science In Medical Diagnostics And Therapy 2026, 9 DOI: 10.1115/1.4069442.Peer-Reviewed Original ResearchModified Physical Performance TestPhysical performance testsPhysical functionPractice agreementMeasures of physical functionPatients' physical performanceRehabilitation cliniciansPhysical medicineRehabilitation unitBalance scoresLimits of agreementPhysical performancePearson correlation testClinician oversightTime scoresInpatient sectionRehabilitationBland-Altman analysisPerformance testsClinical trialsScoresCorrelation testMotor dysfunctionTime investmentClinicians
2025
The effect of osteochondral fragment loss on maximal tibiotalar articular stress in posterior malleolus fractures: A finite element study
Roytman G, Rizzo S, Jonnalagadda A, Tommasini S, Wiznia D, Yoo B. The effect of osteochondral fragment loss on maximal tibiotalar articular stress in posterior malleolus fractures: A finite element study. Injury 2025, 56: 112754. PMID: 40972084, DOI: 10.1016/j.injury.2025.112754.Peer-Reviewed Original ResearchPosterior malleolus fractureContact stressOsteochondral defectsMalleolus fractureAnkle rangeArticular contact stressSingle-leg-stanceFinite element studyLayer of cartilageFracture sizePosterior-most pointCircular osteochondral defectsMaximal dorsiflexionNo significant differenceCT scanDefect sizeArticular stressFinite elementTibiotalar jointFracture interfaceDorsiflexionElement studyDegree of comminutionAnklePosterior articular surfaceRisk of Distal Femur Fracture in Antegrade Intramedullary Nail Fixation of Proximal Femur Fractures: A Finite Element Study
Roytman G, Lahik S, Tommasini S, Wiznia D, Fram B. Risk of Distal Femur Fracture in Antegrade Intramedullary Nail Fixation of Proximal Femur Fractures: A Finite Element Study. Journal Of Orthopaedic Research® 2025, 43: 1599-1605. PMID: 40443200, DOI: 10.1002/jor.26113.Peer-Reviewed Original ResearchSingle-leg stanceAntegrade intramedullary nailingTip terminationMaximum stressFinite element modelFinite element studyFemur fracturesDistal femur fracturesExtent of failureElement modelLoading scenariosBody weight loadElement studyIntramedullary nail fixationProximal femur fracturesOsteoporotic femursRisk of peri-implant fractureNail fixationWeight loadingIntramedullary nailingLoadPeri-implant fracturesGeriatric patients
2024
Sustentaculum fracture fixation with lateral plate or medial screw fixation are equivalent
Roytman G, Salameh M, Rizzo S, Dhodapkar M, Tommasini S, Wiznia D, Yoo B. Sustentaculum fracture fixation with lateral plate or medial screw fixation are equivalent. Injury 2024, 55: 111532. PMID: 38614015, DOI: 10.1016/j.injury.2024.111532.Peer-Reviewed Original ResearchSubtalar jointCadaveric anklesSustentaculum tali fracturesFresh-frozen cadaveric anklesT-testAssess patient outcomesPaired t-testUn-paired t-testAnkle modelAnkleRight ankleLeft ankleMid-tibiaPatient outcomesRetrospective observational studyScrew fixationObservational studyMethod of fixationFracture fixationBiomechanical functionMedial approachBody massFixation methodsInterosseous ligamentNo significant differenceFabricating patient-specific 3D printed drill guides to treat femoral head avascular necrosis
Bell C, Feizi A, Roytman G, Ramji A, Tommasini S, Wiznia D. Fabricating patient-specific 3D printed drill guides to treat femoral head avascular necrosis. 3D Printing In Medicine 2024, 10: 10. PMID: 38564090, PMCID: PMC10986134, DOI: 10.1186/s41205-024-00208-z.Peer-Reviewed Original ResearchUsing Computed Tomography-Based Three-dimensional Modeling and Computer Navigation for Minimally Invasive Core Decompression and Adjuvant Orthobiologic Therapy of Femoral Head Avascular Necrosis
Feizi A, Bell C, Roytman G, Park N, Wang A, Tommasini S, Wiznia D. Using Computed Tomography-Based Three-dimensional Modeling and Computer Navigation for Minimally Invasive Core Decompression and Adjuvant Orthobiologic Therapy of Femoral Head Avascular Necrosis. Arthroplasty Today 2024, 26: 101337. PMID: 38497084, PMCID: PMC10940782, DOI: 10.1016/j.artd.2024.101337.Peer-Reviewed Original ResearchFemoral head avascular necrosisAvascular necrosisSurgical techniqueCore decompressionBone marrow aspirate concentrateDelay disease progressionOutcome of core decompressionAdjuvant therapyCellular therapyAspirate concentrateDisease progressionFemoral head collapseImprove outcomesLesionsDebilitating conditionTherapyComputer navigationNecrosisDecompressionHead collapseThree-dimensional modelFemoral headOff-the-Shelf Tibial Cone Sizes May Not Accommodate All Patients’ Bone Morphology and May Lead to Cortical Breaches in Revision Total Knee Arthroplasty: A 3D Modeling Study
Tung W, Kunsel K, Roytman G, Donnelley C, Pratola D, Tommasini S, Bernstein J, Wiznia D. Off-the-Shelf Tibial Cone Sizes May Not Accommodate All Patients’ Bone Morphology and May Lead to Cortical Breaches in Revision Total Knee Arthroplasty: A 3D Modeling Study. Arthroplasty Today 2024, 26: 101340. PMID: 38455865, PMCID: PMC10918480, DOI: 10.1016/j.artd.2024.101340.Peer-Reviewed Original ResearchThe feasibility of a novel 3D-Printed patient specific cutting guide for extended trochanteric osteotomies
Bergemann R, Roytman G, Ani L, Ramji A, Leslie M, Tommasini S, Wiznia D. The feasibility of a novel 3D-Printed patient specific cutting guide for extended trochanteric osteotomies. 3D Printing In Medicine 2024, 10: 7. PMID: 38427157, PMCID: PMC10905807, DOI: 10.1186/s41205-024-00204-3.Peer-Reviewed Original ResearchPatient-specific cutting guidesCutting guidesPlanned osteotomySoft tissue injuriesTotal hip arthroplasty surgeryCT scanSurgical techniqueRevision total hip arthroplasty surgeryClinical trialsPerformed osteotomyHip arthroplasty surgeryTissue injuryNon-unionPatientsCadaveric testingSimpleware ScanIPOsteotomySoft tissueTrochanteric osteotomyProximal femurArthroplasty surgeryIntramedullary canalHuman subjectsExtended trochanteric osteotomyFemoral canal