title: [Unstable pertrochanteric femur fractures. Failure rate, lag screw sliding and outcome with extra- and intramedullary devices (PCCP, DHS and PFN)].
abstract: OBJECTIVE
  The dynamic hip screw (DHS) often shows a high incidence of therapeutic failure and an impared outcome in the treatment of the unstable pertrochanteric femur fracture (31A2). Therefore often an intramedullary device is recommended. In a retrospective clinical study we examined whether the percutaneous compression plate (PCCP, Gotfried) provides advantages following unstable fractures in comparison to DHS and PFN.
  
  
  METHODS
  From January 2002 to April 2007 135 patients with unstable pertrochanteric femur fractures underwent internal fixation with the PCCP (n = 46, age 78.3, ASA 2.8), DHS (n = 36, age 75.9, ASA 3.0) or PFN (n = 53, age 77.2, ASA 2.8). Radiological and clinical re-examination of the patients (33 PCCP, 24 DHS, 34 PFN) was performed 17 months later.
  
  
  CONCLUSIONS
  The PCCP was implanted in less time than the DHS and PFN (59 vs. 80 vs. 79 min, p = 0.004). Radiographic screening time was low (PCCP 143 vs. DHS 146 vs. PFN 280 s, p = 0.001). Re-operations for wound infections and haematomas occurred in 2 % after PCCP, 14 % after DHS and 4 % after PFN (p = 0.058). There was a low re-operation rate for fracture fixation complications in PCCP (9 %), in contrast to DHS (25 %) and PFN (13 %, p = 0.109). Cut-out was seen more in DHS (19 %, PCCP 2 %, PFN 4 %, p = 0.005). Lag screw sliding was high with DHS (PCCP 4 mm vs. DHS 9 mm vs. PFN 6 mm, p = 0.032). There was no correlation between lag screw sliding and outcome. PCCP, DHS and PFN had the same functional results in Merle d'Aubigné and Harris hip scores.
  
  
  CONCLUSIONS
  Using the minimally invasive PCCP technique in unstable pertrochanteric femur fractures provides a promising therapy option especially with regard to surgical time, radiographic screening time and failure rate. Lag screw sliding was low. There was no advantage of the intramedullary device PFN.
authors: Klinik für Orthopädie und Unfallchirurgie, Schwerpunkt Unfallchirurgie, Universitätsklinikum der RWTH Aachen, Aachen, Germany. mknobe@ukaachen.de
authors: M
authors: M
authors: Knobe
authors: R
authors: R
authors: Münker
authors: R M
authors: RM
authors: Sellei
authors: B
authors: B
authors: Schmidt-Rohlfing
authors: H J
authors: HJ
authors: Erli
authors: C S
authors: CS
authors: Strobl
authors: F U
authors: FU
authors: Niethard
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001860:Bone Plates; D001863:Bone Screws; D004868:Equipment Failure; D005260:Female; D005264:Femoral Fractures / Q000000981:diagnostic imaging / Q000401:mortality / Q000601:surgery*; D005500:Follow-Up Studies; D005593:Fracture Fixation, Internal / Q000295:instrumentation*; D005594:Fracture Fixation, Intramedullary / Q000295:instrumentation*; D017102:Fracture Healing / Q000502:physiology; D018460:Fractures, Comminuted / Q000000981:diagnostic imaging / Q000401:mortality / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures / Q000295:instrumentation*; D011183:Postoperative Complications / Q000000981:diagnostic imaging / Q000401:mortality / Q000601:surgery*; D011859:Radiography; D012086:Reoperation; D012189:Retrospective Studies; D015996:Survival Rate