Modes of Failure of Custom Expandable Repiphysis Prostheses by Aditya V. Maheshwari, Patrick F. Bergin, and Robert M. Henshaw J Bone Joint Surg Am Volume

Modes of Failure of Custom Expandable Repiphysis Prostheses

by Aditya V. Maheshwari, Patrick F. Bergin, and Robert M. Henshaw

J Bone Joint Surg AmVolume 93(13):e72

July 6, 2011

©2011 by The Journal of Bone and Joint Surgery, Inc.

Aditya V. Maheshwari et al. J Bone Joint Surg Am 2011;93:e72




Figs. 2-A, 2-B, and 2-C Case 2.



Anteroposterior and lateral radiographs, made just before the revision to a new Repiphysis implant, show the fracture of the spring and the expansion mechanism leading to collapse of the

previously expanded implant (bold arrows) along with extensive metal w...



Clinical photograph, made during the revision surgery, shows extensive metallosis with a dark greenish-gray pseudocapsule surrounding the prosthesis.



Figs. 3-A through 3-E Case 3.



Anteroposterior radiographs made immediately after the first surgery (left) and at the time of the three-month follow-up (right) show substantial lengthening of the implant with expansion of the

spring mechanism and failure of the trumpet flare (arrows).



Intraoperative photograph shows the broken spring mechanism.



Photograph showing the extracted parts of the spring mechanism and the trumpet flare (arrow).



Anteroposterior and lateral radiographs made after injection of the bone cement through the window in the prosthesis to lock the expansion mechanism in situ and to seal the internal

mechanism.



An illustration showing the internal design of a Repiphysis distal femoral replacement prosthesis.



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Modes of Failure of Custom Expandable Repiphysis Prostheses by Aditya V. Maheshwari, Patrick F. Bergin, and Robert M. Henshaw J Bone Joint Surg Am Volume