title: Lumbar total disc arthroplasty: coronal midline definition and optimal TDA placement.
abstract: It is a general principle with arthroplasty insertion that precise implant centering is critical for long term function and outcome. Whilst some authors have proclaimed that lumbar total disc arthroplasty (TDA) may be different, and that off -centre placement may be functionally well tolerated, these claims are premature: significantly worse clinical results have already been reported with poorly placed TDA at 2 years. Accurate TDA placement requires a precise and consistent definition of the desired coronal midline target (which is currently lacking), as well as a procedural mechanism to optimize placement at that target. We summarize our experience, as well as others', in achieving these two requirements. Long-term outcomes after lumbar TDA insertion should only be compared with results from fusion where TDAs have been implanted accurately.
authors.affiliation: University Hospital of North Tees, Department of Spinal Surgery, Hardwick, Stockton North Tees, United Kingdom. l.a.g.marshman@btinternet.com
authors.forename: Laurence A G
authors.initials: LA
authors.lastname: Marshman
authors.forename: Tai
authors.initials: T
authors.lastname: Friesem
authors.forename: Y Raja
authors.initials: YR
authors.lastname: Rampersaud
authors.forename: Jean-Charles
authors.initials: JC
authors.lastname: Le Huec
authors.forename: Manoj
authors.initials: M
authors.lastname: Krishna
authors.forename: Guru R
authors.initials: GR
authors.lastname: Reddy
mesh_terms: D019643:Arthroplasty, Replacement / Q000379:methods*; D006801:Humans; D008159:Lumbar Vertebrae; D013122:Spinal Diseases / Q000601:surgery*; D025321:Surgery, Computer-Assisted / Q000379:methods*