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Radiographic wear assessment in a total knee prosthesis. 5- to 9-year follow-up study of 158 knees

Sanzén, Lennart LU ; Sahlström, Arne; Gentz, Carl-Fredrik and Redlund-Johnell, Inga LU (1996) In Journal of Arthroplasty 11(6). p.738-742
Abstract
One hundred fifty-eight Porous-Coated Anatomic (Howmedica, Rutherford, NJ) primary total knee prostheses were evaluated clinically and radiographically to measure the remaining thickness of the plastic insert. Anteroposterior radiographs were taken with the beam guided parallel to the tibial plate by a fluoroscope. The knees were forced into varus and valgus, and the heights of the medial and lateral joint spaces, respectively, were measured with a digitizing table. Plastic insert wear could be calculated after correction with a magnification error factor, established by dividing the projected width of the tibial plate by the true size of the used component. After a mean follow-up period of 84 months (range, 58-116 months), wear was... (More)
One hundred fifty-eight Porous-Coated Anatomic (Howmedica, Rutherford, NJ) primary total knee prostheses were evaluated clinically and radiographically to measure the remaining thickness of the plastic insert. Anteroposterior radiographs were taken with the beam guided parallel to the tibial plate by a fluoroscope. The knees were forced into varus and valgus, and the heights of the medial and lateral joint spaces, respectively, were measured with a digitizing table. Plastic insert wear could be calculated after correction with a magnification error factor, established by dividing the projected width of the tibial plate by the true size of the used component. After a mean follow-up period of 84 months (range, 58-116 months), wear was significantly higher for patients with osteoarthritis than rheumatoid arthritis and was 1.4 mm versus 0.7 mm medially (P < .0001) and 0.7 mm versus 0.4 mm laterally (P = .01). Wear was not correlated to thickness of the plastic insert or length of follow-up period. Young age or varus alignment contributed slightly to the amount of wear. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
knee prosthesis, wear, fluoroscopy, radiography, polyethylene
in
Journal of Arthroplasty
volume
11
issue
6
pages
738 - 742
publisher
Elsevier
external identifiers
  • pmid:8884451
  • scopus:0029825882
ISSN
0883-5403
DOI
10.1016/S0883-5403(96)80014-3
language
English
LU publication?
yes
id
f81ac721-1ed8-4c4a-8d78-6077469ad638 (old id 1110362)
date added to LUP
2008-07-29 10:50:10
date last changed
2017-01-01 05:17:28
@article{f81ac721-1ed8-4c4a-8d78-6077469ad638,
  abstract     = {One hundred fifty-eight Porous-Coated Anatomic (Howmedica, Rutherford, NJ) primary total knee prostheses were evaluated clinically and radiographically to measure the remaining thickness of the plastic insert. Anteroposterior radiographs were taken with the beam guided parallel to the tibial plate by a fluoroscope. The knees were forced into varus and valgus, and the heights of the medial and lateral joint spaces, respectively, were measured with a digitizing table. Plastic insert wear could be calculated after correction with a magnification error factor, established by dividing the projected width of the tibial plate by the true size of the used component. After a mean follow-up period of 84 months (range, 58-116 months), wear was significantly higher for patients with osteoarthritis than rheumatoid arthritis and was 1.4 mm versus 0.7 mm medially (P &lt; .0001) and 0.7 mm versus 0.4 mm laterally (P = .01). Wear was not correlated to thickness of the plastic insert or length of follow-up period. Young age or varus alignment contributed slightly to the amount of wear.},
  author       = {Sanzén, Lennart and Sahlström, Arne and Gentz, Carl-Fredrik and Redlund-Johnell, Inga},
  issn         = {0883-5403},
  keyword      = {knee prosthesis,wear,fluoroscopy,radiography,polyethylene},
  language     = {eng},
  number       = {6},
  pages        = {738--742},
  publisher    = {Elsevier},
  series       = {Journal of Arthroplasty},
  title        = {Radiographic wear assessment in a total knee prosthesis. 5- to 9-year follow-up study of 158 knees},
  url          = {http://dx.doi.org/10.1016/S0883-5403(96)80014-3},
  volume       = {11},
  year         = {1996},
}