Measurement of Skull Bone Thickness for Bone-Anchored Hearing Aids

Federspil, P; Tretbar, Steffen; Böhlen, Friederike H.; Rohde, Stefan; Glaser, Simon; Plinkert, Peter K.

doi:10.1097/mao.0b013e3181d2775f

Cited by 12 publications

(4 citation statements)

References 28 publications

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“…Temporal bone thickness has been extensively studied in the context of otological surgery ( 5 , 34 , 36 – 38 ). Our study reproduces the known variability, showing the largest available bone thickness within a radius of 19 mm from Henle's Spine.…”

Section: Discussionmentioning

confidence: 99%

Quantitative Analysis of Temporal Bone Density and Thickness for Robotic Ear Surgery

et al. 2021

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Background and Objective: Quantitative assessment of bone density and thickness in computed-tomography images offers great potential for preoperative planning procedures in robotic ear surgery.Methods: We retrospectively analyzed computed-tomography scans of subjects undergoing cochlear implantation (N = 39). In addition, scans of Thiel-fixated ex-vivo specimens were analyzed (N = 15). To estimate bone mineral density, quantitative computed-tomography data were obtained using a calibration phantom. The temporal bone thickness and cortical bone density were systematically assessed at retroauricular positions using an automated algorithm referenced by an anatomy-based coordinate system. Two indices are proposed to include information of bone density and thickness for the preoperative assessment of safe screw positions (Screw Implantation Safety Index, SISI) and mass distribution (Column Density Index, CODI). Linear mixed-effects models were used to assess the effects of age, gender, ear side and position on bone thickness, cortical bone density and the distribution of the indices.Results: Age, gender, and ear side only had negligible effects on temporal bone thickness and cortical bone density. The average radiodensity of cortical bone was 1,511 Hounsfield units, corresponding to a bone mineral density of 1,145 mg HA/cm3. Temporal bone thickness and cortical bone density depend on the distance from Henle's spine in posterior direction. Moreover, safe screw placement locations can be identified by computation of the SISI distribution. A local maximum in mass distribution was observed posteriorly to the supramastoid crest.Conclusions: We provide quantitative information about temporal bone density and thickness for applications in robotic and computer-assisted ear surgery. The proposed preoperative indices (SISI and CODI) can be applied to patient-specific cases to identify optimal regions with respect to bone density and thickness for safe screw placement and effective implant positioning.

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Section: Discussionmentioning

confidence: 99%

Quantitative Analysis of Temporal Bone Density and Thickness for Robotic Ear Surgery

et al. 2021

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“…The use of ultrasound in inflammatory soft tissue conditions and superficial tissue disorders of the head and neck region has been long established [ 19 ]. In spite of all limitations, monitoring for bone healing and the detection of intrabony lesions by US have shown promising results [ 1 ].…”

Section: Discussionmentioning

confidence: 99%

“…Federspil et al [ 19 ], in 2010, measured the temporal bone thickness by ultrasonography. They used formaldehyde-preserved human cadaver temporoparietal bones and the ultrasonic probe was placed directly on the bone surface with no soft tissue or soft tissue substitute being used.…”

Section: Discussionmentioning

confidence: 99%

Effect of Cortical Bone Thickness on Detection of Intraosseous Lesions by Ultrasonography

Adibi

Shakibafard²,

Sarvestani

et al. 2015

Radiology Research and Practice

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Background. Usefulness of ultrasound (US) in detection of intrabony lesions has been showed. A cortical bone perforation or a very thin and intact cortical bone is prerequisite for this purpose. Objective. The current in vitro study was aimed at measuring the cut-off thickness of the overlying cortical bone which allows ultrasonic assessment of bony defects. Materials and Methods. 20 bovine scapula blocks were obtained. Samples were numbered from 1 to 20. In each sample, 5 artificial lesions were made. The lesions were made in order to increase the overlying bone thickness, from 0.1 mm in the first sample to 2 mm in the last one (with 0.1 mm interval). After that, the samples underwent ultrasound examinations by two practicing radiologists. Results. All five lesions in samples numbered 1 to 11 were detected as hypoechoic area. Cortical bone thickness more than 1.1 mm resulted in a failure in the detection of central lesions. Conclusion. We can conclude that neither bony perforation nor very thin cortical bones are needed to consider US to be an effective imaging technique in the evaluation of bony lesion.

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“…Bone-anchored implantable hearing aid system (BAHA) is feasible only in children 6 years of age or above because 3 to 4 mm of bone is needed to ensure osseointegration. 148 …”

Section: Treatmentmentioning

confidence: 99%

CMV-induced Hearing Loss

Maheshwari,

Singh,

Boppana

2024

Newborn

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Congenital cytomegalovirus (cCMV) infection is the most common fetal viral infection and contributes to about 25% of childhood hearing loss by the age of 4 years. It is the leading nongenetic cause of sensorineural hearing loss (SNHL). Infants born to seroimmune mothers are not completely protected from SNHL, although the severity of their hearing loss may be milder than that seen in those whose mothers had a primary infection. Both direct cytopathic effects and localized inflammatory responses contribute to the pathogenesis of cytomegalovirus (CMV)-induced hearing loss. Hearing loss may be delayed onset, progressive or fluctuating in nature, and therefore, a significant proportion will be missed by universal newborn hearing screening (NHS) and warrants close monitoring of hearing function at least until 5–6 years of age. A multidisciplinary approach is required for the management of hearing loss. These children may need assistive hearing devices or cochlear implantation depending on the severity of their hearing loss. In addition, early intervention services such as speech or occupational therapy could help better communication, language, and social skill outcomes. Preventive measures to decrease intrauterine CMV transmission that have been evaluated include personal protective measures, passive immunoprophylaxis and valacyclovir treatment during pregnancy in mothers with primary CMV infection. Several vaccine candidates are currently in testing and one candidate vaccine in phase 3 trials. Until a CMV vaccine becomes available, behavioral and educational interventions may be the most effective strategy to prevent maternal CMV infection.

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Measurement of Skull Bone Thickness for Bone-Anchored Hearing Aids

Cited by 12 publications

References 28 publications

Quantitative Analysis of Temporal Bone Density and Thickness for Robotic Ear Surgery

Quantitative Analysis of Temporal Bone Density and Thickness for Robotic Ear Surgery

Effect of Cortical Bone Thickness on Detection of Intraosseous Lesions by Ultrasonography

CMV-induced Hearing Loss

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