Middle Ear Prosthesis Displacement in High-Strength Magnetic Fields

Williams, Michelle D.; Antonelli, Patrick J.; Williams, Laura B.; Moorhead, Jacquelyn E.

doi:10.1097/00129492-200103000-00007

Cited by 29 publications

(30 citation statements)

References 10 publications

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“…Biomechanically and histologically completely different from the original, allograft ossicles made of stainless steel, titanium, glass ceramics and Plastipore not surprisingly have a signifi cant incidence of extrusion, may incite infection and foreign body reaction in the middle ear [20,21] . Diagnostic imaging may be hindered by ferromagnetic ossicle prostheses [22] . Even the highly biocompatible hydroxyapatite is being degraded by macrophages and multinucleated giant cells [23] .…”

Section: Discussionmentioning

confidence: 99%

A New Ossicle Homograft Inactivation/Preservation Procedure: Clinical Results

Romualdez

Stauffer²,

Häusler³

et al. 2005

ORL

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A new NaOH-autoclaving inactivation/preservation procedure (IPP) for ossicle homografts, complying with the actual infectious disease guidelines, has been developed and used in our institution for 5 years. This study compares the clinical and audiological results of middle ear reconstruction using the new NaOH-autoclaving inactivated ossicle homografts (22 patients) and the previously used cialit-formaldehyde inactivation procedure (28 patients). During the follow-up period, no homograft extrusion, resorption or disease transmission was observed either for the NaOH-autoclaving or for the cialit-formaldehyde protocol. A postoperative air-bone gap of less than 20 dB in 44% and a postoperative hearing improvement of 10–50 dB in 70% of patients complies with the published success rates of homograft ossiculoplasty in the literature. The analysis and comparison of both tested IPP-patient groups showed no statistically significant differences in the clinical and the audiological results. The NaOH-autoclaving inactivation/preservation protocol should increase ossicle homograft safety even with respect to prion exposure. The good anatomic and audiological long-term results of the new IPP protocol confirm homograft ossicles as a valid and inexpensive approach for middle ear reconstruction.

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Section: Discussionmentioning

confidence: 99%

A New Ossicle Homograft Inactivation/Preservation Procedure: Clinical Results

Romualdez

Stauffer²,

Häusler³

et al. 2005

ORL

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“…1.5 T are becoming more common in research and clinical institutions worldwide (8)(9)(10)(11). Although studies have been conducted to evaluate the safe exposure of implant patients to MRI (8)(9)(10)(11)(12)(13)(14)(15)(16)(17), to our knowledge, no studies have been conducted to assess the safe exposure of elderly implant patients and those who have suffered a past or current episode of infection involving the implant site to MRI. This study tested the strength of human cardiac valve annulus tissue ex vivo in order to determine the forces required to cause partial or total detachment of a heart valve from the surrounding tissue, i.e., valve dehiscence.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Testing of Human Cardiac Tissue: Some Implications for MRI Safety

Edwards¹,

Draper²,

Hand³

et al. 2005

Journal of Cardiovascular Magnetic Resonance

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Specific age-related degenerative cardiac diseases stiffen and strengthen tissue resulting in significant forces being required to pull a suture through valve annulus tissue. These forces are significantly greater than magnetically induced < 4.7 T. Therefore, patients with degenerative valvular diseases are unlikely to be at risk of valve dehiscence during exposure to static magnetic field < or = 4.7 T.

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“…In a study presented by Williams et al (6), an in vivo cadaver TB model demonstrated no displacement of prostheses made from nonferromagnetic stainless steel. In a recent animal study presented by Syms (8), where the Note that none of the prostheses moved in the l.5-T, but all moved in the 9.4 T-MRI scanner.…”

Section: Discussionmentioning

confidence: 96%

“…Williams et al (6) observed no deflections on their suspended string models when titanium was tested. No induced force on titanium prostheses was found by Martin et al (7) in a 3-T MR field; in addition, it was shown, using a new commercially available Fluoroptic thermometer (Luxtron, Santa Clara, CA), that no heating occurred in the titanium prostheses.…”

Section: Discussionmentioning

confidence: 97%

Magnetic Properties of Middle Ear and Stapes Implants in a 9.4-T Magnetic Resonance Field

Fritsch¹,

Gutt²,

Naumann³

2006

Otology &Amp; Neurotology

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Middle ear and stapes implants can move dramatically in petri dishes at 9.4-T MR field, more so than at 1.5 and 3.0 T. The absence of avulsions in the TB group strongly suggests that the surgical means used to fixate the middle ear implants to the middle ear structures successfully overcomes the magnetic moment produced at MR field strengths up to 9.4 T. The use of MR imaging is not contraindicated by this study's findings.

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Middle Ear Prosthesis Displacement in High-Strength Magnetic Fields

Cited by 29 publications

References 10 publications

A New Ossicle Homograft Inactivation/Preservation Procedure: Clinical Results

A New Ossicle Homograft Inactivation/Preservation Procedure: Clinical Results

Mechanical Testing of Human Cardiac Tissue: Some Implications for MRI Safety

Magnetic Properties of Middle Ear and Stapes Implants in a 9.4-T Magnetic Resonance Field

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