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To describe the process of developing a craniosynostosis decision aid.We conducted a mixed-methods exploratory study between August 2019 and March 2020 to develop a decision aid about surgical treatment for single suture craniosynostosis.A single tertiary care academic children's hospital.The decision aid development team consisted of surgeons, research fellows, a clinical nurse practitioner, clinical researchers with expertise in decision science, and a university-affiliated design school. Qualitative interviews (N = 5) were performed with families, clinicians (N = 2), and a helmeting orthotist to provide feedback on decision aid content, format, and usability.After cycles of revisions and iterations, 3 related decision aids were designed and approved by the marketing arm of our institution. Distinct booklets were created to enable focused discussion of treatment options for the 3 major types of single suture craniosynostosis (sagittal, metopic, unicoronal).Three decision aids representing the 3 most common forms of single suture craniosynostosis were developed. Clinicians found the decision aids could help facilitate discussions about families' treatment preferences, goals, and concerns.We developed a customizable decision aid for single suture craniosynostosis treatment options. This tool lays the foundation for shared decision-making by assessing family preferences and providing clear, concise, and credible information regarding surgical treatment. Future research can evaluate this tool's impact on patient-clinician discussions about families' goals and preferences for treatment.
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Craniossinostoses , Criança , Humanos , Craniossinostoses/cirurgia , Técnicas de Apoio para a DecisãoRESUMO
OBJECTIVE: To critically analyze pediatric opioid prescription patterns after cleft and craniosynostosis repairs. DESIGN: Observational study 1) retrospectively reviewing pediatric opioid prescriptions from July 2018 to June 2019 and 2) prospectively surveying patients about actual opioid use from August 2019 to February 2020. SETTING: Academic tertiary care pediatric hospital. PATIENTS: 133 pediatric patients undergoing cleft lip and/or palate or craniosynostosis repairs. Prospective surveys were offered at postoperative visits; 45 of 69 eligible patients were enrolled. INTERVENTION: None. MAIN OUTCOME MEASURES: Opioid doses prescribed at discharge and actual home opioid use. RESULTS: 90 patients with cleft lip and/or palate and 43 patients with craniosynostosis were included. Median prescribed opioid doses were 10.3 for cleft lip and/or palate procedures (range 0-75), and 14.3 for craniosynostosis repairs (range 0-50). In patients with cleft lip and/or palate, there was a negative correlation between age at surgery and prescribed opioid doses (rs = -0.228, p = 0.031). 45 patients completed surveys of home opioid use. No patients used more than 10 doses. Forty percent used no opioids at home, 33% used 1 to 2 doses, 18% used 3 to 5 doses, and 9% used 6 to 10 doses. CONCLUSIONS: Opioid prescriptions vary widely after common craniofacial procedures. Younger patients with cleft lip and/or palate may be more likely to be prescribed more doses. Actual home opioid use is less than prescribed amounts, with most patients using five or fewer doses. A prescribing guideline is proposed.
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Fenda Labial , Fissura Palatina , Craniossinostoses , Criança , Humanos , Analgésicos Opioides/uso terapêutico , Fenda Labial/cirurgia , Estudos Retrospectivos , Estudos Prospectivos , Fissura Palatina/cirurgia , Padrões de Prática Odontológica , Craniossinostoses/cirurgiaRESUMO
OBJECTIVE: To examine the frequency of autologous and alloplastic ear reconstructions for patients with microtia in the United States, and describe post-index procedure rates associated with each method. DESIGN: Retrospective cohort study. SETTING: Claims data from 500 + hospitals from IBM® MarketScan® Commercial and Multi-State Medicaid databases. PATIENTS/PARTICIPANTS: A total of 649 patients aged 1 to 17 years with International Classification of Diseases, ninth/tenth revision (ICD-9/10) diagnoses for microtia, congenital absence of the ear, or hemifacial microsomia. INTERVENTIONS: Alloplastic or autologous ear reconstruction between 2006 and 2018. MAIN OUTCOME MEASURE: Post-index procedures performed within 1 year following the index repair, analyzed across the study period and separately for each half of the study period (2006-2012, 2012-2018). RESULTS: A total of 486 (75%) qualifying patients received autologous and 163 (25%) received alloplastic reconstruction. Secondary procedure rates were significantly higher in the autologous group at 90 days (P = .034), 180 days (P < .001), and at 365 days (P < .001). Alloplastic reconstruction accounted for 23.2% of reconstructions in the first half of the study period compared with 26.7% in the second half (P = .319). One-year secondary procedure rates in the autologous group were not significantly different between both halves of the study period (69.7% vs 67.1%, P = .558), but were significantly lower in the second half for the alloplastic group (44.9% vs 20.2%, P = .001). CONCLUSIONS: In these databases, autologous reconstruction is more common than alloplastic reconstruction. Autologous reconstruction is staged, with most undergoing a secondary procedure between 3 months and 1 year postoperatively. Secondary procedure rates decreased over time in patients undergoing alloplastic reconstruction.
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BACKGROUND: The opioid abuse crisis is rampant in the United States. Children and adolescents are unique risk groups in this crisis; age-specific concerns include accidental ingestion and association with high-risk behaviors. Studies aimed at disposal are limited in pediatric patients. Our study aimed to determine whether an educational brochure detailing a simple opioid disposal method using dish soap could enhance disposal in postoperative pediatric patients. METHODS: A prospective survey study of pediatric plastic surgery patients at the St. Louis Children's Hospital was performed from January to December 2020. Patients were assigned into two groups: those who received the educational brochure at the time of surgery and those who did not. In clinic, patient caretakers completed anonymous preoperative and/or postoperative surveys regarding opioid use and disposal. RESULTS: Surveys of 326 patients were analyzed (188 preoperative, 120 pre/postoperative, and 18 postoperative). Prescribed opioids were all consumed in 19% of patients. Receiving the educational brochure significantly increased the opioid disposal of leftover medications: 78% versus 35% (OR 6.52, 95% CI [2.03, 21.37], p < 0.001). Although not statistically significant owing to small sample size (p = 0.09), 71.4% of families with excess opioids in the home preoperatively retained unused postoperative opioids versus 31.6% without preoperative opioids. CONCLUSIONS: Postoperative opioids are overprescribed for most pediatric plastic surgery patients. A simple brochure significantly increases proper postoperative opioid disposal, representing a cost-effective, convenient, risk-free method to decrease opioid misuse and accumulation in our communities.
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Analgésicos Opioides , Transtornos Relacionados ao Uso de Opioides , Adolescente , Analgésicos Opioides/uso terapêutico , Criança , Humanos , Transtornos Relacionados ao Uso de Opioides/prevenção & controle , Dor Pós-Operatória/tratamento farmacológico , Dor Pós-Operatória/prevenção & controle , Padrões de Prática Médica , Estudos Prospectivos , Sabões , Inquéritos e QuestionáriosRESUMO
Patients with unilateral cleft lip often require secondary procedures due to asymmetric fullness or deficiencies along the mucosal free margin of the upper lip. Here, we describe our technique for mucosal advancement and repair to attain symmetry. METHODS: Maneuvers to obtain vermilion and mucosal height include (1) use of a tailored vermilion flap; (2) supraperiosteal release of the lesser segment; (3) backcut "poker incision" to mobilize the mucosal flap on the lesser segment; (4) transverse release of mucosa across the greater segment; (5) accurate reduction along vermilion-mucosal junction; and (6) bilateral medial mucosal advancement. To examine postoperative outcomes, photographic data were available for 14 patients with unilateral complete cleft lip. The Cleft Lip Component Symmetry Index was then calculated as a ratio of upper lip height on cleft to noncleft sides, where an index of 1 indicates symmetry. RESULTS: Sixteen consecutive patients underwent unilateral cleft lip repair with this technique over a 3-year period, none of whom have required secondary operations. The symmetry index for 14 of 16 patients was 1.02 ± 0.11 (95% confidence interval [0.96, 1.08], P = 0.56), demonstrating satisfactory upper lip symmetry. CONCLUSIONS: Postoperative asymmetry after unilateral cleft lip repair, particularly along the free margin, continues to be a common problem, necessitating secondary procedures. The technique of mucosal repair merits more careful attention than it has previously received, and here we describe in detail a method that has allowed for improved symmetry.
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OBJECTIVE: To determine the rate of revision alveolar bone grafting (ABG) in patients with cleft lip and palate (CLP) before and after the introduction of postoperative computed tomography (CT). DESIGN: Retrospective case-control study analyzing the incidence of revision ABG in patients with and without postoperative CT scans for graft success evaluation. SETTING: Academic tertiary care pediatric hospital. PATIENTS: Eighty-seven patients with CLP or cleft lip and alveolus treated with autologous iliac crest bone grafting for alveolar clefts over a 10-year period (January 2009 to March 2019) with minimum 6-month follow-up. Fifty patients had postoperative CT evaluation; 37 did not. INTERVENTIONS: Postoperative CT to determine ABG success, versus standard clinical examination and 2-dimensional radiographs. MAIN OUTCOME MEASURES: Requirement for revision ABG, defined as failure of the original graft by clinical or radiographic examination. RESULTS: Fifty-eight percent of patients underwent a postoperative CT scan at median interval of 10 months after surgery. Patients with postoperative CT evaluation had a 44% rate of revision ABG (22/50) for inadequate graft take, compared to 5% (2/37) in patients without postoperative CT (P < .001; 95% CT, 31%-58% in the CT group, 1%-16% in the non-CT group). CONCLUSIONS: Computed tomography evaluation after ABG is associated with a significantly increased revision rate for inadequate graft take. The presence of a secondary palatal fistula at the time of original ABG is not associated with revision requirement. Lack of standardized dental and orthodontic records complicates the study of ABG outcomes and presents an area for systems-based improvement.
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Enxerto de Osso Alveolar , Fenda Labial , Fissura Palatina , Transplante Ósseo , Estudos de Casos e Controles , Criança , Fenda Labial/diagnóstico por imagem , Fenda Labial/cirurgia , Fissura Palatina/diagnóstico por imagem , Fissura Palatina/cirurgia , Humanos , Estudos Retrospectivos , Tomografia Computadorizada por Raios XRESUMO
BACKGROUND: Several studies have illustrated the efficacy of pregabalin in decreasing postoperative opioid use in adults undergoing orthognathic surgery. We aimed to study the effects of a single dose of preoperative pregabalin on total opioid consumption after orthognathic surgery in individuals with cleft lip and palate. METHODS: This is a retrospective cohort study of consecutive patients who underwent Le Fort I midface advancement between June 2012 and July 2019. All patients had a diagnosis of cleft lip and palate. The treatment group received a 1-time preoperative dose of pregabalin; the control group did not. Total morphine milligram equivalent (MME) consumption was calculated by adding intraoperative and postoperative opioid use during admission. RESULTS: Twenty-three patients were included in this study; 12 patients received pregabalin. The pregabalin group had significantly lower total opioid consumption (total MME 70.95 MME; interquartile range [IQR]: 24.65-150.17) compared to the control group (138.00 MME; IQR: 105.00-232.48) (MUâ=â31.00, Pâ=â0.031). The difference in mean pain scores in the treatment group (3.21â±â2.03) and the control group (3.71â±â2.95) was not statistically significant (Pâ=â0.651, 95% confidence interval -1.75 to 2.75). CONCLUSIONS: A 1-time preoperative dose of pregabalin before orthognathic surgery in patients with cleft lip and palate reduced total opioid consumption during admission without increasing patient pain. A single preemptive dose of pregabalin should be considered an effective adjunct to pain management protocols in patients undergoing orthognathic surgery.
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Fenda Labial , Fissura Palatina , Cirurgia Ortognática , Adulto , Analgésicos Opioides/uso terapêutico , Fenda Labial/cirurgia , Fissura Palatina/cirurgia , Humanos , Dor Pós-Operatória/tratamento farmacológico , Pregabalina/uso terapêutico , Estudos RetrospectivosRESUMO
BACKGROUND: Hand-injured patients seen in the emergency department can often be followed as outpatients for definitive care and rehabilitation. Many face barriers to continuing care in the outpatient setting that impact quality of care delivery. The authors aimed to evaluate patterns of outpatient follow-up after initial emergency department evaluation of traumatic hand injuries, identify factors associated with poor follow-up, and suggest areas for improvement. METHODS: In this retrospective cohort study, the authors reviewed records of adult patients with acute hand injuries referred for outpatient follow-up after initial plastic surgery consultation in the emergency department of a single urban Level I trauma center over a 12-month period (n = 300). Patients were grouped by insurance (i.e., no insurance, Medicaid, Medicare, or private). Outcomes included completion of outpatient follow-up, hand therapy participation, and emergency department return visits. RESULTS: Factors significantly associated with failure to follow up included male sex (OR, 3.58; 95 percent CI, 1.57 to 8.16), uninsured status (OR, 3.47; 95 percent CI, 1.48 to 8.16), Medicaid insurance (OR, 4.46; 95 percent CI, 1.31 to 15.25), and lack of a driver's license (OR, 3.35; 95 percent CI, 1.53 to 7.34). Hand therapy attendance and unexpected emergency department return visits also varied significantly by insurance type (p < 0.001). CONCLUSIONS: There is a significant disparity in the use of outpatient care after emergency department visits for acute hand injuries. Uninsured and Medicaid-insured patients are significantly less likely to initiate recommended hand specialty follow-up, and significantly less likely to complete follow-up even when established with an outpatient clinic. Future research should evaluate targeted interventions for at-risk patients.
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Assistência ao Convalescente/estatística & dados numéricos , Assistência Ambulatorial/estatística & dados numéricos , Traumatismos da Mão/terapia , Disparidades em Assistência à Saúde/estatística & dados numéricos , Cobertura do Seguro/estatística & dados numéricos , Cooperação do Paciente/estatística & dados numéricos , Encaminhamento e Consulta/estatística & dados numéricos , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Assistência Ambulatorial/economia , Serviço Hospitalar de Emergência , Feminino , Humanos , Modelos Logísticos , Masculino , Medicaid/estatística & dados numéricos , Pessoas sem Cobertura de Seguro de Saúde/estatística & dados numéricos , Medicare/estatística & dados numéricos , Pessoa de Meia-Idade , Garantia da Qualidade dos Cuidados de Saúde , Indicadores de Qualidade em Assistência à Saúde/estatística & dados numéricos , Estudos Retrospectivos , Estados Unidos , Adulto JovemRESUMO
OBJECTIVE: Combined metopic-sagittal craniosynostosis is traditionally treated with open cranial vault remodeling and fronto-orbital advancement, sometimes in multiple operations. Endoscopic treatment of this multisuture synostosis presents a complex challenge for the surgeon and orthotist. METHODS: The authors retrospectively analyzed the preoperative and 1-year postoperative CT scans of 3 patients with combined metopic-sagittal synostosis, all of whom were treated with simultaneous endoscope-assisted craniectomy of the metopic and sagittal sutures followed by helmet therapy. Established anthropometric measurements were applied to assess pre- and postoperative morphology, including cranial index and interfrontal divergence angle (IFDA). Patients' measurements were compared to those obtained in 18 normal controls. RESULTS: Two boys and one girl underwent endoscope-assisted craniectomy at a mean age of 81 days. The mean preoperative cranial index was 0.70 (vs control mean of 0.82, p = 0.009), corrected postoperatively to a mean of 0.82 (vs control mean of 0.80, p = 0.606). The mean preoperative IFDA was 110.4° (vs control mean of 152.6°, p = 0.017), corrected postoperatively to a mean of 139.1° (vs control mean of 140.3°, p = 0.348). The mean blood loss was 100 mL and the mean length of stay was 1.7 days. No patient underwent reoperation. The mean clinical follow-up was 3.4 years. CONCLUSIONS: Endoscope-assisted craniectomy with helmet therapy is a viable single-stage treatment option for combined metopic-sagittal synostosis, providing correction of the stigmata of trigonoscaphocephaly, with normalization of the cranial index and IFDA.
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OBJECTIVE: Management of craniosynostosis at an early age is important for mitigating the risk of abnormal cranial development, but treatment can result in significant expenses. Previous research has shown that endoscope-assisted craniectomy (EAC) is less costly than open cranial vault remodeling (CVR) for patients with sagittal synostosis. The aim of this study was to strengthen the existing body of healthcare cost research by elucidating the charges associated with open and endoscopic treatment for patients with nonsagittal synostosis. METHODS: The authors performed a retrospective analysis of data obtained in 41 patients who underwent open CVR and 38 who underwent EAC with postoperative helmet therapy for nonsagittal, single-suture craniosynostosis (metopic, coronal, and lambdoid) between 2008 and 2018. All patients were < 1 year of age at the time of surgery and had a minimum 1 year of follow-up. Inpatient charges, physician fees, helmet charges, and outpatient clinic visits in the 1st year were analyzed. RESULTS: The mean ages of the children treated with EAC and open CVR were 3.5 months and 8.7 months, respectively. Patients undergoing EAC with postoperative helmet therapy required more outpatient clinic visits in the 1st year than patients undergoing CVR (4 vs 2; p < 0.001). Overall, 13% of patients in the EAC group required 1 helmet, 30% required 2 helmets, 40% required 3 helmets, and 13% required 4 or more helmets; the mean total helmeting charges were $10,072. The total charges of treatment, including inpatient charges, physician fees, outpatient clinic visit costs, and helmet charges, were significantly lower for the EAC group than they were for the open CVR group ($50,840 vs $95,588; p < 0.001). CONCLUSIONS: Despite the additional charges for postoperative helmet therapy and the more frequent outpatient visits, EAC is significantly less expensive than open CVR for patients with metopic, coronal, and lambdoid craniosynostosis. In conjunction with the existing literature on clinical outcomes and perioperative resource utilization, these data support EAC as a cost-minimizing treatment for eligible patients with nonsagittal synostosis.
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BACKGROUND: Implant-based breast reconstruction is the most common method of breast reconstruction in the United States, but the outcomes of subsequent implant-based reconstruction after a tissue expander complication are rarely studied. The purpose of this study was to determine the long-term incidence of implant loss in patents with a previous tissue expander complication. METHODS: This is a retrospective review of the long-term outcomes of all patients with tissue expander complications at a large academic medical center from 2003 to 2013. Patients with subsequent tissue expander or implant complications were compared to those with no further complications to assess risk factors for additional complications or reconstructive failure. RESULTS: One hundred sixty-two women were included in this study. The mean follow-up period was 8.3 ± 3.1 years. Forty-eight women (30 percent) went on to undergo a second tissue expander or implant placement. They did not differ from women who went on to autologous reconstruction or no further reconstruction. Of these, 34 women (71 percent) had no further complications and 38 women (79 percent) had a successful implant-based reconstruction at final follow-up. There were no patient or surgical factors significantly associated with a second complication or implant loss. CONCLUSIONS: Following tissue expander complications, it is reasonable to offer women a second attempt at tissue expansion and implant placement. This study demonstrates that long-term success rates are high, and there are no definitive patient or surgical factors that preclude a second attempt at implant-based breast reconstruction. CLINICAL QUESTION/LEVEL OF EVIDENCE: Risk, III.
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Implante Mamário/métodos , Implantes de Mama , Dispositivos para Expansão de Tecidos/efeitos adversos , Expansão de Tecido/efeitos adversos , Centros Médicos Acadêmicos , Adulto , Neoplasias da Mama/patologia , Neoplasias da Mama/cirurgia , Estudos de Coortes , Estética , Feminino , Seguimentos , Humanos , Modelos Logísticos , Mastectomia/métodos , Pessoa de Meia-Idade , Falha de Prótese , Reoperação/métodos , Estudos Retrospectivos , Medição de Risco , Estatísticas não Paramétricas , Resultado do Tratamento , Estados UnidosRESUMO
The use of Eduard Pernkopf's anatomic atlas presents ethical challenges for modern surgery concerning the use of data resulting from abusive scientific work. In the 1980s and 1990s, historic investigations revealed that Pernkopf was an active National Socialist (Nazi) functionary at the University of Vienna and that among the bodies depicted in the atlas were those of Nazi victims. Since then, discussions persist concerning the ethicality of the continued use of the atlas, because some surgeons still rely on information from this anatomic resource for procedural planning. The ethical implications relevant to the use of this atlas in the care of surgical patients have not been discussed in detail. Based on a recapitulation of the main arguments from the historic controversy surrounding the use of Pernkopf's atlas, this study presents an actual patient case to illustrate some of the ethical considerations relevant to the decision of whether to use the atlas in surgery. This investigation aims to provide a historic and ethical framework for questions concerning the use of the Pernkopf atlas in the management of anatomically complex and difficult surgical cases, with special attention to implications for medical ethics drawn from Jewish law.
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Anatomia Transversal/ética , Cirurgia Geral/ética , Ilustração Médica/história , Síndromes de Compressão Nervosa/cirurgia , Neuralgia/cirurgia , Adulto , Anatomia Transversal/história , Dissecação/ética , Dissecação/história , Feminino , Cirurgia Geral/métodos , História do Século XX , Holocausto , Humanos , Socialismo Nacional , Síndromes de Compressão Nervosa/complicações , Neuralgia/etiologia , Nervos Periféricos/anatomia & histologia , Nervos Periféricos/cirurgia , II Guerra MundialRESUMO
Background To evaluate whether the timing of surgery after radiation in autologous breast reconstruction affects major complications. Methods We performed a retrospective review of 454 free flaps (331 patients) for breast reconstruction at a single institution from 2003 to 2014. Charts were reviewed for age, BMI, laterality, flap type (TRAM, msTRAM, DIEP), surgeon, donor vessels (IMA, TD), chemotherapy, smoking, diabetes, hypertension, DVT, venous anastomoses, vein size, and time from radiation (none, < 12 months, or ≥ 12 months). The primary outcome of major complications was defined as partial/total flap loss, thrombosis, ischemia, or hematoma requiring return to the operating room. To identify independent predictors of major complications, a multivariate logistic regression was constructed. Alpha = 0.05 indicated significance in all tests. Results Average age was 47.4 ± 8.4. Free flaps consisted of msTRAM (41.1%), TRAM (29.6%), or DIEP (29.3%). The donor vessel was IMA in 66.9% of flaps or TD in 33.0% of patients with 90.7% using only one vein and 9.3% with two veins. The average IMA/TDV size was 2.5 cm ± 0.5. Preoperative radiation occurred in 31.2% of flaps. There were 54 flaps with at least one major complication (11.7%). On multivariate regression, only flap type (OR =4.04, p < .01) and vein size (OR = 0.13, p = 0.02) independently predicted major complications. Conclusion There was no significant difference in major complications between flaps who had reconstruction within 12 months and greater than 12 months after radiation. Only having a more muscle sparing technique or smaller vein size were independent risk factors for major complications.
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Neoplasias da Mama/radioterapia , Neoplasias da Mama/cirurgia , Mamoplastia/métodos , Complicações Pós-Operatórias/prevenção & controle , Feminino , Retalhos de Tecido Biológico , Guias como Assunto , Humanos , Pessoa de Meia-Idade , Complicações Pós-Operatórias/cirurgia , Reto do Abdome/transplante , Estudos Retrospectivos , Fatores de Risco , Retalhos Cirúrgicos/irrigação sanguínea , Fatores de Tempo , Resultado do TratamentoRESUMO
BACKGROUND: Previous studies have shown that open cranial vault remodeling does not fully address the endocranial deformity. This study aims to compare endoscopic-assisted suturectomy with postoperative molding helmet therapy to traditional open reconstruction by quantifying changes in cranial base morphology and posterior cranial vault asymmetry. METHODS: Anthropometric measurements were made on pre- and 1-year postoperative three-dimensionally reconstructed computed tomography scans of 12 patients with unilateral lambdoid synostosis (8 open and 4 endoscopic-assisted). Cranial base asymmetry was analyzed using: posterior fossa deflection angle (PFA), petrous ridge angle (PRA), mastoid cant angle (MCA), and vertical and anterior-posterior (A-P) displacement of external acoustic meatus (EAM). Posterior cranial vault asymmetry was quantified by volumetric analysis. RESULTS: Preoperatively, patients in the open and endoscopic groups were statistically equivalent in PFA, PRA, MCA, and A-P EAM displacement. At 1 year postoperatively, open and endoscopic patients were statistically equivalent in all measures. Mean postoperative PFA for the open and endoscopic groups was 6.6 and 6.4 degrees, PRA asymmetry was 6.4 and 7.6%, MCA was 4.0 and 3.2 degrees, vertical EAM displacement was -2.3 and -2.3 millimeters, and A-P EAM displacement was 6.8 and 7.8 millimeters, respectively. Mean volume asymmetry was significantly improved in both open and endoscopic groups, with no difference in postoperative asymmetry between the 2 groups (Pâ=â0.934). CONCLUSIONS: Patients treated with both open and endoscopic repair of lambdoid synostosis show persistent cranial base and posterior cranial vault asymmetry. The results of endoscopic-assisted suturectomy with postoperative molding helmet therapy are similar to those of open calvarial vault reconstruction.