title: The influence of incudostapedial joint separation on the middle ear transfer function.
abstract: OBJECTIVE
  One of the risks in middle ear surgery is high frequency hearing loss. It is believed that manipulations on the middle ear ossicles with the instruments may cause overstimulation of the inner ear and damage of the hear cells. Controversy arises whether temporary separation of the ossicles has any impact on middle ear transfer function and hearing threshold after surgery. The aim of the study is to evaluate the influence of incudostapedial joint (ISJ) separation on middle ear function in an experimental model.
  
  
  METHODS
  With the use of single point laser Doppler vibrometer (LDV) stapes velocity in the intact chain and after ISJ separation was measured in 5 fresh human cadaver temporal bones.
  
  
  RESULTS
  In all cases there was a decrease in stapes velocity after ISJ separation. Mead stapes velocity was reduced for 1 dB in 800 Hz to 9 dB in frequencies above 1,000 Hz. The decrease of velocity was greater in higher frequencies.
  
  
  CONCLUSIONS
  Separation of the ISJ does not reduce significantly the middle ear function.
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, Medical University of Lublin, Lublin, Poland.
authors.forename: Marcin
authors.initials: M
authors.lastname: Szymanski
authors.affiliation: Department of Applied Mechanics, Lublin University of Technology, Lublin, Poland.
authors.forename: Rafał
authors.initials: R
authors.lastname: Rusinek
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, Medical University of Lublin, Lublin, Poland.
authors.forename: Marek
authors.initials: M
authors.lastname: Zadrozniak
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, Medical University of Lublin, Lublin, Poland.
authors.forename: Kamal
authors.initials: K
authors.lastname: Morshed
authors.affiliation: Department of Applied Mechanics, Lublin University of Technology, Lublin, Poland.
authors.forename: Jerzy
authors.initials: J
authors.lastname: Warminski
keywords: Hearing loss; Incudostapedial joint; Laser Doppler velocimetry; Middle ear mechanics