title: [Post-traumatic osteoarthritis of the knee: special indication for navigated TKA].
abstract: Different studies confirmed the increased radiological implantation accuracy for computer-assisted total knee replacements. There was no study stating a significant influence of the navigation technique for total knee arthroplasties on the early clinical outcomes. In these two case reports we try to show special indications for a navigated total knee replacement to utilize the benefits of a navigation system as efficiently as possible.Case 1 had a femoral neck fracture 3 years ago and was treated with a long femoral gamma nail. The hardware was still retained. Case 2 had a fracture of the femoral diaphysis 31 years ago and showed an extra-articular deformity in the frontal and sagittal planes. Both patients developed osteoarthritis of the ipsilateral knee and were implanted with a total knee prosthesis using a navigation system.In both cases the prosthesis components showed perfect radiological alignment. The clinical outcomes at the 3-month follow-up were very satisfying. In case 1 the femoral nail did not have to be removed, thus decreasing surgery duration by 40-60 min.In both cases, the impossibility of using a femoral intramedullary alignment rod could be compensated for by the navigation system.
authors.affiliation: Academic Teaching Hospital, Department of Orthopedic Surgery, Medical University of Innsbruck, Carinagasse 47, A-6800 Feldkirch, Osterreich. Arno.Martin@lkhf.at
authors.forename: A
authors.initials: A
authors.lastname: Martin
authors.forename: O
authors.initials: O
authors.lastname: Wohlgenannt
authors.forename: M
authors.initials: M
authors.lastname: Prenn
authors.forename: A
authors.initials: A
authors.lastname: von Strempel
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D001696:Biomechanical Phenomena; D017760:Bone Malalignment / Q000000981:diagnostic imaging / Q000601:surgery; D005260:Female; D005264:Femoral Fractures / Q000601:surgery*; D005265:Femoral Neck Fractures / Q000601:surgery*; D005500:Follow-Up Studies; D006801:Humans; D008875:Middle Aged; D010003:Osteoarthritis / Q000601:surgery*; D011183:Postoperative Complications / Q000000981:diagnostic imaging / Q000601:surgery*; D011474:Prosthesis Design; D017755:Prosthesis Fitting; D012086:Reoperation; D025321:Surgery, Computer-Assisted / Q000379:methods*; D014057:Tomography, X-Ray Computed