title: The effect of stem modularity and mode of fixation on tibial component stability in revision total knee arthroplasty.
abstract: The effect of stem length, diameter, and mode of fixation on the motion and stress transfer of a cemented tibial tray were evaluated for in 12 cadaver knees. There was a significant decrease in motion of the tibial tray with increasing press-fit stem length (75-150 mm) and increasing stem diameter (10-14 mm). Cemented tibial stems showed significantly less tray motion than uncemented stems. The short cemented stems produced tray stability equivalent to long press-fit stems. Although there was a trend for increased proximal tibial stress shielding with the use of cement and longer, wider stems, the trend was not statistically significant. Modular, press-fit stems can achieve tray stability similar to a smaller cemented stem and can avoid the potential problems with cement.
authors.affiliation: Department of Orthopaedic Surgery, New York University-Hospital for Joint Diseases, New York, New York 10003, USA.
authors.forename: L M
authors.initials: LM
authors.lastname: Jazrawi
authors.forename: B
authors.initials: B
authors.lastname: Bai
authors.forename: F J
authors.initials: FJ
authors.lastname: Kummer
authors.forename: R
authors.initials: R
authors.lastname: Hiebert
authors.forename: S A
authors.initials: SA
authors.lastname: Stuchin
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D019544:Equipment Failure Analysis; D006801:Humans; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000503:physiopathology / Q000601:surgery; D011474:Prosthesis Design; D016059:Range of Motion, Articular / Q000502:physiology*; D012086:Reoperation; D016474:Weight-Bearing / Q000502:physiology*