Five Cases of Failure of the Tibial Polyethylene Insert Locking Mechanism in One Design of Constrained Knee Arthroplasty

Venkata R. Rapuri, Henry D. Clarke, Mark J. Spangehl, Christopher P. Beauchamp

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We describe 5 cases of failure of the locking mechanism of the polyethylene insert and tibial base-plate in one design of constrained condylar knee prosthesis due to disengagement of the locking screw. Loosening of the screw is believed to occur because of a counterclockwise torque created by the axial rotation of the femur on the tibia that occurs as the knee extends during gait. This torque is transmitted via the highly rotationally constrained femoral housing and tibial post to the locking screw. These failures suggest that an alternative locking mechanism should be considered for this prosthesis.

Original languageEnglish (US)
JournalJournal of Arthroplasty
Volume26
Issue number6
DOIs
StatePublished - Sep 2011

Fingerprint

Knee Replacement Arthroplasties
Torque
Polyethylene
Knee Prosthesis
Thigh
Tibia
Gait
Femur
Prostheses and Implants
Knee

Keywords

  • Constrained condylar prosthesis
  • Failure
  • Knee arthroplasty
  • Locking screw

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Medicine(all)

Cite this

Five Cases of Failure of the Tibial Polyethylene Insert Locking Mechanism in One Design of Constrained Knee Arthroplasty. / Rapuri, Venkata R.; Clarke, Henry D.; Spangehl, Mark J.; Beauchamp, Christopher P.

In: Journal of Arthroplasty, Vol. 26, No. 6, 09.2011.

Research output: Contribution to journalArticle

Rapuri, Venkata R. ; Clarke, Henry D. ; Spangehl, Mark J. ; Beauchamp, Christopher P. / Five Cases of Failure of the Tibial Polyethylene Insert Locking Mechanism in One Design of Constrained Knee Arthroplasty. In: Journal of Arthroplasty. 2011 ; Vol. 26, No. 6.
@article{80f68b76f96346f1bb9d32961e093c2e,
title = "Five Cases of Failure of the Tibial Polyethylene Insert Locking Mechanism in One Design of Constrained Knee Arthroplasty",
abstract = "We describe 5 cases of failure of the locking mechanism of the polyethylene insert and tibial base-plate in one design of constrained condylar knee prosthesis due to disengagement of the locking screw. Loosening of the screw is believed to occur because of a counterclockwise torque created by the axial rotation of the femur on the tibia that occurs as the knee extends during gait. This torque is transmitted via the highly rotationally constrained femoral housing and tibial post to the locking screw. These failures suggest that an alternative locking mechanism should be considered for this prosthesis.",
keywords = "Constrained condylar prosthesis, Failure, Knee arthroplasty, Locking screw",
author = "Rapuri, {Venkata R.} and Clarke, {Henry D.} and Spangehl, {Mark J.} and Beauchamp, {Christopher P.}",
year = "2011",
month = "9",
doi = "10.1016/j.arth.2010.07.013",
language = "English (US)",
volume = "26",
journal = "Journal of Arthroplasty",
issn = "0883-5403",
publisher = "Churchill Livingstone",
number = "6",

}

TY - JOUR

T1 - Five Cases of Failure of the Tibial Polyethylene Insert Locking Mechanism in One Design of Constrained Knee Arthroplasty

AU - Rapuri, Venkata R.

AU - Clarke, Henry D.

AU - Spangehl, Mark J.

AU - Beauchamp, Christopher P.

PY - 2011/9

Y1 - 2011/9

N2 - We describe 5 cases of failure of the locking mechanism of the polyethylene insert and tibial base-plate in one design of constrained condylar knee prosthesis due to disengagement of the locking screw. Loosening of the screw is believed to occur because of a counterclockwise torque created by the axial rotation of the femur on the tibia that occurs as the knee extends during gait. This torque is transmitted via the highly rotationally constrained femoral housing and tibial post to the locking screw. These failures suggest that an alternative locking mechanism should be considered for this prosthesis.

AB - We describe 5 cases of failure of the locking mechanism of the polyethylene insert and tibial base-plate in one design of constrained condylar knee prosthesis due to disengagement of the locking screw. Loosening of the screw is believed to occur because of a counterclockwise torque created by the axial rotation of the femur on the tibia that occurs as the knee extends during gait. This torque is transmitted via the highly rotationally constrained femoral housing and tibial post to the locking screw. These failures suggest that an alternative locking mechanism should be considered for this prosthesis.

KW - Constrained condylar prosthesis

KW - Failure

KW - Knee arthroplasty

KW - Locking screw

UR - http://www.scopus.com/inward/record.url?scp=84856349953&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84856349953&partnerID=8YFLogxK

U2 - 10.1016/j.arth.2010.07.013

DO - 10.1016/j.arth.2010.07.013

M3 - Article

C2 - 20801615

AN - SCOPUS:84856349953

VL - 26

JO - Journal of Arthroplasty

JF - Journal of Arthroplasty

SN - 0883-5403

IS - 6

ER -