title: The Effect of Porous Tantalum Cones on Mechanical Alignment and Canal-Fill Ratio in Revision Total Knee Arthroplasty Performed with Uncemented Stems.
abstract: In revision total knee arthroplasty (TKA), the internal diameter of metal cones may limit the ability of the stem to properly fill the medullary canal. We prospectively studied 115 patients who underwent revision TKA with uncemented stems to evaluate the effect of metal cones on mechanical alignment and stem positioning. Correction on the mechanical alignment was well achieved in all patients, regardless of whether a metal cone was used. The proportion of patients achieving restoration of neutral mechanical alignment was similar between groups, as were the mean canal fill ratio (CFR) and the proportion of patients achieving CFR ≥ 85%. The use of porous tantalum cones in revision TKA with uncemented stems is not an obstacle in achieving optimal mechanical alignment and stem positioning.
authors.affiliation: Department of Orthopaedic Surgery, CHU de Québec, Hôpital de l'Enfant Jésus, Québec City, QC, Canada.
authors.forename: Martin
authors.initials: M
authors.lastname: Bédard
authors.affiliation: Université Laval, Québec City, QC, Canada.
authors.forename: Katherine
authors.initials: K
authors.lastname: Cabrejo-Jones
authors.affiliation: Department of Orthopaedic Surgery, CHU de Québec, Hôpital Saint-François d'Assise, Québec City, QC, Canada.
authors.forename: Michèle
authors.initials: M
authors.lastname: Angers
authors.affiliation: Université Laval, Québec City, QC, Canada.
authors.forename: Rémi
authors.initials: R
authors.lastname: Pelletier-Roy
authors.affiliation: Department of Orthopaedic Surgery, CHU de Québec, Hôpital de l'Enfant Jésus, Québec City, QC, Canada.
authors.forename: Stéphane
authors.initials: S
authors.lastname: Pelet
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation* / Q000379:methods; D005260:Female; D006801:Humans; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D016348:Osseointegration; D016062:Porosity; D011446:Prospective Studies; D012086:Reoperation / Q000295:instrumentation; D013635:Tantalum; D016896:Treatment Outcome
chemical_list: D013635:Tantalum
keywords: canal fill ratio; mechanical alignment; revision total knee arthroplasty; trabecular metal cones; uncemented stems