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The polyethylene prosthesis as described by Shea for reestablishing ossicular continuity after stapedectomy for otosclerosis is usually adequate.
On occasion, the oval window is deeply placed under the horizontal portion of the facial canal and further buried by the promontory. The prosthesis, made from No. 90 polyethylene tubing in the usual manner, is generally too large in diameter, even though beveled at the tip, and impinges on the facial canal or promontory. This problem has been overcome by use of No. 90 and No. 50 polyethylene tubing.
The prosthesis is made in this manner: A cuff of 2 mm. of No 90 tubing is made by threading a No. 50 tube into the No. 90 tubing and cutting it to the desired length of 2 mm. As the prosthesis is generally between 4 mm. and 5 mm. in total length, the rest of the prosthesis is No. 50 tubing. This
STORRS LA. Polyethylene Columella Prosthesis. Arch Otolaryngol. 1961;73(5):564. doi:10.1001/archotol.1961.00740020576012
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