Ilda Molloy, MD, MS
Assistant ProfessorCards
About
Research
Publications
2026
Tapping our resources: do preoperative aspirations add diagnostic value in hip and knee periprosthetic joint infection?
Spichler-Moffarah A, Daddi L, Molloy I, Luu T, Nguyen D, Golden M. Tapping our resources: do preoperative aspirations add diagnostic value in hip and knee periprosthetic joint infection? Journal Of Bone And Joint Infection 2026, 11: 315-321. PMID: 42254316, PMCID: PMC13235295, DOI: 10.5194/jbji-11-315-2026.Peer-Reviewed Original ResearchIntraoperative culturesSynovial aspirationPreoperative aspirationDiagnostic valueKnee periprosthetic joint infectionIntraoperative culture resultsPositive intraoperative culturesTime of surgeryCohort of hipsPeriprosthetic joint infectionIntraoperative specimensIntraoperative samplesAspirate culturesConcordant patientsPJI patientsAdult patientsLaboratory variablesAntibiotic exposureCulture resultsJoint infectionDiscordant resultsDiscordant groupGram negativesPatientsPJINo Improvement in Infection or Complication Rate with Extended Oral Antibiotic Prophylaxis After Primary Total Joint Arthroplasty
Raju A, Jahagirdar O, Pour A, Golden M, Molloy I, Grauer J, Wiznia D. No Improvement in Infection or Complication Rate with Extended Oral Antibiotic Prophylaxis After Primary Total Joint Arthroplasty. The Journal Of Arthroplasty 2026 PMID: 42173207, DOI: 10.1016/j.arth.2026.05.044.Peer-Reviewed Original ResearchThis study investigates extended oral antibiotic prophylaxis after joint replacement surgery, showing no reduction in infection rates or complications compared to standard care.Clinical and Nonclinical Determinants of Simultaneous vs Staged Bilateral Total Knee Arthroplasty
Maloy G, Day W, Halperin S, Islam W, Grauer J, Molloy I. Clinical and Nonclinical Determinants of Simultaneous vs Staged Bilateral Total Knee Arthroplasty. Arthroplasty Today 2026, 39: 102025. PMID: 42100109, PMCID: PMC13145251, DOI: 10.1016/j.artd.2026.102025.Peer-Reviewed Original ResearchStaged bilateral TKABilateral TKASimultaneous bilateral TKABilateral total knee arthroplastyTotal knee arthroplastyStaged bilateral total knee arthroplastyNonclinical factorsMultivariate logistic regressionKnee arthroplastyElixhauser Comorbidity IndexNonclinical determinantsAdult patientsStaging procedureSurgical decisionSurgical selectionPatient characteristicsComorbidity indexStaged fashionPatientsSimultaneous procedureTKA patientsLogistic regressionOddsArthroplastySurgeryConversion Total Knee Arthroplasty in Patients Who Have Periarticular Hardware: One Operation May Be Enough
Molloy I, Abbaszadeh A, Yilmaz M, Sherman M, Restrepo C, Parvizi J. Conversion Total Knee Arthroplasty in Patients Who Have Periarticular Hardware: One Operation May Be Enough. The Journal Of Arthroplasty 2026 PMID: 41839357, DOI: 10.1016/j.arth.2026.03.020.Peer-Reviewed Original ResearchConversion TKAHardware removalBody mass indexStaging procedureTotal knee arthroplastyPeriarticular hardwareOptimal managementOutcomes of patientsConversion total knee arthroplastySignificant differenceRemoval of hardwareStatistically significant differenceKnee arthroplastyTime of TKARate of infectionPostoperative complicationsPatient agePostoperative infectionNo significant differenceSurgical approachSurgical intervention(sRetrospective studyMass indexPrimary outcomeActive infectionHealth-Related Social Needs Are Associated With Worse Physical Function, Pain, and Mobility in Hip and Knee Osteoarthritis Patients at Presentation
Winter A, Hayashi C, Túa-Vargas L, Chau N, Gibson D, Rubin L, Molloy I, Wiznia D. Health-Related Social Needs Are Associated With Worse Physical Function, Pain, and Mobility in Hip and Knee Osteoarthritis Patients at Presentation. Arthroplasty Today 2026, 37: 101871. PMID: 42254073, PMCID: PMC13237586, DOI: 10.1016/j.artd.2025.101871.Peer-Reviewed Original ResearchHealth-related social needsPatient-Reported Outcomes Measurement Information SystemPatient-Reported Outcomes Measurement Information System scoresKnee osteoarthritis patientsPhysical functionOsteoarthritis patientsFinancial strainAssociated with worse physical functionLiving situationOutcomes Measurement Information SystemCenters for Medicare & Medicaid ServicesPain interference domainsSingle-institution cross-sectional studyMeasurement Information SystemWorse physical functionMental health domainsPain interference scoresIn-person interviewsCross-sectional studySocial needsHealthcare disparitiesWeighted least squares linear regressionHealth domainsMental healthMedicaid ServicesHealth-Related Social Needs Associated With Worse Patient-Reported Outcomes and Increased Adverse Events Following Total Joint Arthroplasty
Hayashi C, Winter A, Túa-Vargas L, Chau N, Kalia A, Gibson D, Rubin L, Molloy I, Wiznia D. Health-Related Social Needs Associated With Worse Patient-Reported Outcomes and Increased Adverse Events Following Total Joint Arthroplasty. Arthroplasty Today 2026, 37: 101739. PMID: 41993229, PMCID: PMC13081215, DOI: 10.1016/j.artd.2025.101739.Peer-Reviewed Original ResearchHealth-related social needsPatient-reported outcomesFood insecurityAssociated with worse patient-reported outcomesPatient-reported outcome measuresHealth-care equitySingle-institution cross-sectional studyBlack patientsEmergency department visitsIn-person interviewsPostoperative physical functionCross-sectional studyRisk of readmissionOdds of reoperationPhysical functionAdverse social conditionsDepartment visitsIn-personEmergency departmentCharlson Comorbidity IndexPersonal healthOutcome measuresTKA outcomesScreening toolWhite patientsIntraoperative Vancomycin Does Not Change Periprosthetic Joint Infection Risk in Patients Undergoing Total Joint Arthroplasty
Jiang W, Sanchez J, Halperin S, Molloy I, Grauer J, Rubin L. Intraoperative Vancomycin Does Not Change Periprosthetic Joint Infection Risk in Patients Undergoing Total Joint Arthroplasty. The Journal Of Arthroplasty 2026 PMID: 41544893, DOI: 10.1016/j.arth.2026.01.043.Peer-Reviewed Original ResearchRevision-free survivalPeriprosthetic joint infectionIntraoperative vancomycinSurgical site infectionSite infectionMatched patientsMethicillin-resistant Staphylococcus aureusOdds of superficial surgical site infectionsSuperficial surgical site infectionLog-rank testKaplan-Meier analysisBody mass indexMultivariate logistic regressionAssociated with lower oddsCefazolin prophylaxisProphylactic antibioticsElixhauser Comorbidity IndexAntibiotic prescriptionsAdult patientsAdverse eventsJoint infectionMass indexMedical complicationsType II diabetesComorbidity index
2025
TAPPING OUR RESOURCES: DO PREOPERATIVE ASPIRATIONS ADD DIAGNOSTIC VALUE?
Moffarah A, Luu T, Daddi L, Nguyen D, Molloy I, Golden M. TAPPING OUR RESOURCES: DO PREOPERATIVE ASPIRATIONS ADD DIAGNOSTIC VALUE? Orthopaedic Proceedings 2025, 107-B: 70-70. DOI: 10.1302/1358-992x.2025.12.070.Peer-Reviewed Original ResearchProsthetic joint infectionMethicillin-sensitive Staphylococcus aureusKnee prosthetic joint infectionIntraoperative culturesSynovial aspirationPreoperative antibioticsRetrospective reviewAspirate culturesAbsence of antibiotic therapyNegative preoperative culturesPositive intraoperative culturesNegative intraoperative culturesTime of surgeryIntraoperative specimensPreoperative culturesAntibiotic therapyDiscordant patientsPolymicrobial infectionsNegative culturesPreoperative aspirationSurgical managementJoint infectionPatientsSurgeryConcordant results2025 ICM: Antibiotic Prophylaxis in Primary Joint Arthroplasty
Cooper A, Lima A, Luo T, Arshi A, Spangehl M, Elganzoury I, Mortazavi S, Adjel A, Ahadi K, Albatran K, Alkhawashki H, Akinola B, Anderson L, Babazadeh S, Brause B, Buterin A, Cao L, Carvalho A, Certain L, Cordero J, Cortés-Penfield N, Gahramanov A, García-Bógalo R, Hansen E, Hewlett A, Hoveidaei A, Humbatov A, Kallel S, Kigera J, Kim K, Lastinger A, Lopreite F, Luque J, Lustig S, Madjarevic T, Molloy I, Moucha C, Novikov D, Poultsides L, Poursalehian M, Rajgopal A, Reznice J, Riaz T, Rodriguez-Pardo D, Ronde-Oustau C, Schade M, Sekar P, Suleiman L, Talevski D, Tarabichi S, Villafuerte J, Walter B, Yamada K, Young S, Younis A. 2025 ICM: Antibiotic Prophylaxis in Primary Joint Arthroplasty. The Journal Of Arthroplasty 2025, 41: s362-s375. PMID: 41161514, DOI: 10.1016/j.arth.2025.08.061.Peer-Reviewed Original ResearchNasal Methicillin-Resistant Staphylococcus Aureus Screening in Orthopaedic Patients: We Should Not Ignore Methicillin-sensitive Staphylococcus Aureus
Abbaszadeh A, Molloy I, Restrepo C, Parvizi J. Nasal Methicillin-Resistant Staphylococcus Aureus Screening in Orthopaedic Patients: We Should Not Ignore Methicillin-sensitive Staphylococcus Aureus. The Journal Of Arthroplasty 2025, 41: 576-580. PMID: 40570987, DOI: 10.1016/j.arth.2025.06.072.Peer-Reviewed Original ResearchMethicillin-resistant S. aureusMethicillin-sensitive S. aureusPrevalence of methicillin-resistant S. aureusMethicillin-sensitive S. aureus colonizationPrevalence of methicillin-sensitive S. aureusSurgical site infectionS. aureus colonizationCharlson Comorbidity IndexNasal screeningS. aureusStaphylococcus aureusMethicillin-resistant S. aureus colonizationCause of surgical site infectionMethicillin-resistant Staphylococcus aureus screeningScreening patientsMethicillin-sensitive Staphylococcus aureusOrthopaedic patientsDecolonization of patientsStaphylococcus aureus screeningHistory of coagulopathyOrthopaedic proceduresRisk of colonizationPoorly controlled hypertensionMethicillin-sensitiveElective orthopaedic procedures
Clinical Care
Overview
Ilda Molloy, MD MS, is an assistant professor of orthopaedics at Yale School of Medicine specializing in primary hip and knee replacements, including less invasive anterior hip approaches. Additionally, she performs partial knee replacements, and complex revision hip and knee replacements with extensive training in navigation, robotics, and patient-specific arthroplasty.
Dr. Molloy’s decision to become an orthopaedic surgeon followed a passion for helping patients with hip and knee disorders regain their mobility and independence. “I work with patients to redefine their limitations and provide both operative and nonoperative solutions to their pain. I empower them to participate in their care,” she says.
Adult reconstructive surgery through total hip and knee arthroplasty has become ubiquitous in orthopaedic practice due to its success in improving pain and restoring physical function. "While there is gratification in seeing patients take their first pain-free steps after a successful primary total joint replacement, my passion lies in the revision surgeries—helping in cases where there is not a straightforward solution. These cases require a comprehensive understanding of the pathology and creativity in formulating an operative plan,” Dr. Molloy says.
Dr. Molloy also is a published researcher and public speaker trained in health informatics at The Dartmouth Institute. Her research includes assessment and improvement of patient outcomes, development of appropriate patient expectations, and surgeon performance measures.
Fact Sheets
Periacetabular Osteotomy (PAO)
Learn More on Yale MedicineOsteoarthritis
Learn More on Yale MedicineTotal Hip Replacement (Direct Anterior Approach)
Learn More on Yale MedicineHip Labral Tears
Learn More on Yale Medicine
Board Certifications
Orthopaedic Surgery
- Certification Organization
- AB of Orthopaedic Surgery
- Original Certification Date
- 2025
Yale Medicine News
News
News
- June 29, 2026
The Case for Fewer Antibiotics in Joint Replacement Surgery
- January 01, 2026Source: WFSB
Doctors warn against doing too much too quickly when starting New Year fitness routines
- September 23, 2024Source: Washington Post
How to relieve hip pain
- June 24, 2024Source: Consumer Reports
How to Relieve Hip Pain: The moves, meds, and other treatments you should know about
Get In Touch
Contacts
Locations
Patient Care Locations
Are You a Patient? View this doctor's clinical profile on the Yale Medicine website for information about the services we offer and making an appointment.