ABSTRACT
Objective To analyze the characteristics of spontaneous otoacoustic emission in full-term newbo‐rns .Methods The Capella OAE equipment (Madsen ,Denmark) was used to test Spontaneous Otoacoustic Emission (SOAE) in 147 cases (236ears) who have passed the newborn hearing screening with TEOAE(Transient Evoked Otoacoustic Emissions) .Results The SOAE incidence was 56 .77% (male 41 .51% ,female 69 .23% ;left ear 49 .14% ,right ear 64 .17% ) .It was significantly higher in females (P<0 .05) and in right ear (P<0 .05) .The av‐erage amplitude was 11 .78 ± 8 .36 dB SPL( 11 .73 ± 8 .25 dB in male ,11 .81 ± 8 .43 dB SPL in female;11 .97 ± 8 .56 dB SPL in the left ear ,11 .65 ± 8 .22 dB SPL in the right ear) .There were significant differences in genders(P<0 .01) .The frequency of SOAE focused on 3 .2~ 3 .7 kHz(2 .9~3 .4 kHz in males ,3 .4~3 .9 kHz in females ;3 .2~3 .7 kHz in the left ears ,3 .2~3 .6 kHz in the right ears) .There were significant differences in genders(P<0 .01) .The average peak of SOAE was 3 .70 ± 2 .75(3 .86 ± 2 .87 in males ,3 .62 ± 2 .70 in females;3 .70 ± 3 .02 in the left ears ,3 .70 ± 2 .55 in the right ears) .There were no significant differences in genders and laterality .Conclusion The characteristics of SOAE in full-term newborns include higher incidences ,multiple peaks and high frequency distribution .
ABSTRACT
ObjectiveTo explore the magnitude of the deformation of Durom cup after press-fit implantation in cadaver models and to investigate which part of the cup would deform the most.Methods Three fresh adult cadaver pelves were harvested and were cleaned of soft tissue,preserving the sacrospinous and sacrotuberous ligaments.Bilateral acetabular replacements in all cadaver pelves were performed by a senior surgeon.All acetabulums were reamed with corresponding reamers,and the direction of reaming was 40°to 45° of abduction and 15° to 20° of anteversion.Larger reamers were used sequentially until the anterior and posterior walls were firmly engaged.Six Durom cups were implanted.The deformation of each cup was detected by 3D Digital Image Correlation (3D DIC) method,and the magnitude and the parts of the deformation were recorded.ResultsThe diameters of cups were 50 mm in 2,52 mm in 2 and 54 mm in 2,respectively.All cups generated different degree of deformation,which were mostly located in the posterior-superior quadrant and the areas of the ramus of ischium.After measuring the maximum deformed areas for three times,it was found that the localized depression deformation occurred in all cups.The average deformation value was (41.73±8.86) μm (range,29.91-49.43 μm).There was no significant change in deformation value 24 hours after press-fit implantation and 7 days after removing the cups.ConclusionDurom large diameter metal acetabular component will generate deformation during the press-fit implantation.And the deformation may play an important role in more wear and more ions release.