Fixation of the stapes footplate in children: a clinical and temporal bone histopathologic study.
OBJECTIVE
To clarify the anatomic characteristics, cause, and surgical outcomes relating to fixation of the stapes footplate in children.


METHODS
Retrospective case review and four-center histopathologic study of temporal bones.


METHODS
Tertiary referral center.


METHODS
We reviewed charts and histologic specimens from 12 children, aged 7 to 13 years, who underwent surgery for footplate fixation. We also studied stapes footplates in 288 temporal bones from 181 children ranging from newborn (20-44 weeks of gestation) to 13 years of age.


METHODS
Anomalies of the stapes footplate in children.


RESULTS
The average age of diagnosis of hearing loss was 6.6 years. Criteria for a diagnosis of otosclerosis were progression of a conductive hearing loss and an intraoperative finding of fixation of the anterior stapediovestibular joint in five patients. In contrast, a nonhomogeneous, thickened, fixed footplate and the absence of an annular ligament were indicators of congenital fixation in six children. In one child, there was neither new bone from the otic capsule nor any obvious otosclerotic foci. In the temporal bone study, 17 of 181 (9.4%) children had anomalies of the stapes footplates, with ankylosis in 4 (2.2%). In two subjects (1.1%), there was an otosclerotic focus not in contact with the stapes footplate.


CONCLUSIONS
Children younger than 6 years with various congenital anomalies are more likely to have congenital footplate fixation, which will present intraoperatively as a thickened footplate with a partial or absent annular ligament. Children older than 6 years with progressive conductive hearing loss are more likely to have otosclerosis, which presents as fixation of the anterior stapediovestibular joint. The difference in surgical outcomes is probably related to different degrees of footplate abnormality.
Bachor
Edgar
E
Department of Otolaryngology, SRH Zentralklinikum Suhl gGmbH, Suhl, Germany. ebmail@web.de
Just
Tino
T
Wright
Charles G
CG
Pau
Hans Wilhelm
HW
Karmody
Collin S
CS
D000293:Adolescent; D000844:Ankylosis / Q000175:diagnosis / Q000601:surgery*; D001301:Audiometry, Pure-Tone; D001309:Auditory Threshold / Q000502:physiology; D002648:Child; D002675:Child, Preschool; D003937:Diagnosis, Differential; D005260:Female; D034381:Hearing Loss / Q000209:etiology* / Q000601:surgery; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D010040:Otosclerosis / Q000175:diagnosis / Q000473:pathology / Q000601:surgery*; D012189:Retrospective Studies; D013199:Stapes / Q000002:abnormalities / Q000473:pathology*; D013201:Stapes Surgery; D013701:Temporal Bone / Q000033:anatomy & histology / Q000473:pathology*; D016896:Treatment Outcome