Is the prosthesis length in malleostapedotomy for otosclerosis revision surgery predictable?

Otol Neurotol. 2014 Aug;35(7):1150-5. doi: 10.1097/MAO.0000000000000448.

Abstract

Hypothesis: The prosthesis length in malleostapedotomy for otosclerosis revision surgery can be calculated if the prosthesis length of previous conventional incus stapedotomy is known.

Background: Malleostapedotomy is used in revision surgery for otosclerosis in case of severe incus erosion and malleus or incus fixation.

Methods: Fifteen cadaveric human temporal bone specimens were investigated by means of micro-CT followed by 3D analysis. The distance between the incus and the stapes footplate as well as distances between the malleus and the footplate were measured and compared.

Results: The required length of virtually bent prostheses corresponded approximately to the 1.5-fold of virtual stapes prostheses in 93%. The addition of 2 mm predicted the required prostheses length almost correctly in 80%.

Conclusion: The clinical practice will show whether a preoperative calculation of expected prosthesis length in MS based on the length of the formerly used stapes prosthesis is possible and helpful.

MeSH terms

  • Humans
  • Incus / surgery*
  • Malleus / surgery*
  • Ossicular Prosthesis*
  • Otosclerosis / surgery*
  • Reoperation
  • Stapes Surgery*
  • Temporal Bone / surgery