Bone Conduction Force Versus Thresholds and Comfort
Toll, Emanuel, and Letowski (2011) report there has been a historic lack of consensus with regard to the amount of static force that should be applied during bone conduction testing. Therefore, the authors evaluated the responses (thresholds and comfort ratings) of 40 participants with normal hearing and no otological abnormalities as they experienced various forces (from 2.4 to 5.4 Newtons) with regard to head-band and head-strap-based bone conducted hearing.
Toll, Emanuel, and Letowski report that “differences in bone conducted thresholds were well within clinically acceptable test-retest values for audiometric testing….” They concluded that “mean BC thresholds differed only slightly (1.0 to 1.5 dB) in response to varied static forces (2.4 to 5.4 N)” and “higher force levels were associated with significantly greater discomfort….”
For More Information, References, and Recommendations
Ho EC, Monksfield P, Egan E, Reid A, Proops D. (2009) Bilateral Bone-Anchored Hearing Aid: Impact on Quality of Life Measured with the Glasgow Benefit Inventory. Otology & Neurotology (30)7:891-896.
Popelka GR, Derebery J, Blevins NH, Murray M, Moore BCJ, Sweetow RW, Wu B, Katsis M. (2010) Preliminary Evaluation of a Novel Bone-Conduction Device for Single-Sided Deafness. Otology & Neurotology 31: 492-497.
Tjellstrom A. (2010) Bone-Anchored Hearing Aids: From a Test Project to An Established Clinical Routine. ENT & Audiology News 19(1):38-40.
Toll LE, Emanuel DC, Letowski T. (2011): Effect of Static Force on Bone Conduction Hearing Thresholds and Comfort. International Journal of Audiology 50:632-635.