title: Peri-implant femoral fractures: The risk is more than three times higher within PFN compared with DHS.
abstract: BACKGROUND
  Information is lacking regarding incidence rates, treatment regimens, and outcomes concerning peri-implant femoral fractures (PIF). Therefore, we performed a retrospective study to provide scientific data concerning incidence and outcome of PIF following osteosynthesis of proximal femoral fractures (PFF).
  
  
  METHODS
  We retrospectively included all patients who received osteosynthesis for PFF between 2006 and 2015 and in whom PIF was confirmed postoperatively. All available patients with PIF were contacted minimum one year post-surgery.
  
  
  RESULTS
  A total of 1314 osteosynthesis procedures were performed, of which 705 were proximal femoral nails (PFNs), 597 were dynamic hip screws (DHSs), and 12 were screws appliances only. During the same period, 18 PIFs (1.4%) were reported. However, PIF was 3.7 times higher within PFN when compared to DHS (15/705:2.1% versus 3/597:0.5%; odds ratio: 3.7). The following analysis also included 8 patients with PIF who were referred from other hospitals, resulting in a total of 26 patients. Mean patient age was 84.8 years (range, 57-95), with a predominance in female (23×) and in the left femur (19×). PIF occurred after an average of 23.6 months (range, 1-81) post-surgery. The fractures, most of which were spiral-shaped, were most commonly treated with locking plate osteosynthesis. The surgical revision rate was 7.7%, and the one-year mortality was 23.1%. At an average of 43.0 months (range, 12-100) post-surgery, it was possible to contact 18/26 patients (69.2%), and their mean Parker Mobility Score was 5.2 points (range 2-9).
  
  
  CONCLUSIONS
  Peri-implant femoral fracture is a rare incident within the old age traumatology of PFF. However, based on our small number of cases, it occurred within PFN much more frequently compared with DHS. Locking plate osteosynthesis has been shown to be effective and reliable. Surgical revision and mortality rates do not appear to be increased when compared to those with the initial treatment of proximal femoral fractures.
authors.affiliation: Clinic for Trauma, Orthopaedic and Sports Medicine, Hospital Barmherzige Brüder, Prüfeninger Str. 86, 93049 Regensburg, Germany. Electronic address: franz.mueller@barmherzige-regensburg.de.
authors.forename: F
authors.initials: F
authors.lastname: Müller
authors.affiliation: Clinic for Trauma, Orthopaedic and Sports Medicine, Hospital Barmherzige Brüder, Prüfeninger Str. 86, 93049 Regensburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Galler
authors.affiliation: Clinic for Trauma, Orthopaedic and Sports Medicine, Hospital Barmherzige Brüder, Prüfeninger Str. 86, 93049 Regensburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Zellner
authors.affiliation: Clinic for Trauma, Orthopaedic and Sports Medicine, Hospital Barmherzige Brüder, Prüfeninger Str. 86, 93049 Regensburg, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Bäuml
authors.affiliation: Fellowship AO Foundation, Sohag University, 82524 Egypt.
authors.forename: A
authors.initials: A
authors.lastname: Marzouk
authors.affiliation: Clinic for Trauma, Orthopaedic and Sports Medicine, Hospital Barmherzige Brüder, Prüfeninger Str. 86, 93049 Regensburg, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Füchtmeier
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001858:Bone Nails; D001863:Bone Screws; D005260:Female; D005264:Femoral Fractures / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery*; D005593:Fracture Fixation, Internal / Q000009:adverse effects / Q000379:methods*; D017102:Fracture Healing; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D057068:Periprosthetic Fractures / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery*; D012086:Reoperation / Q000706:statistics & numerical data*; D012189:Retrospective Studies; D012737:Sex Factors; D016896:Treatment Outcome
keywords: Dynamic hip screw; Hip fracture; Peri-implant; Proximal femoral nail