Pinloc or Hansson pins: a multicenter, randomized controlled study of 439 patients treated for femoral neck fractures

• Published in: OTA international : the open access journal of orthopaedic trauma 2023-12, Vol.6 (4), p.e282-e282
• Main Authors: Åberg, Henrik, Kalland, Kristine, Jonsson, Kenneth B., Johansson, Torsten
• Format: Article
• Language: English
• Subjects: Clinical/Basic Science; femoral neck fracture; Hansson Pin System; Hansson Pinloc system; internal fixation
• ISSN: 2574-2167; 2574-2167
• DOI: 10.1097/OI9.0000000000000282

ObjectivesTo compare the recently developed Hansson Pinloc system, which features 3 cylindrical parallel pins with hooks connected through a fixed-angle interlocking plate, with the Hansson Pin System (2 hook pins) for the treatment of femoral neck fractures. DesignOne hundred fourteen patients with displaced femoral neck fractures and 325 patients with nondisplaced fractures from 9 orthopaedic centers were randomized to either Hansson Pinloc system or Hansson Pin System and followed for 2 years or until death. Age at inclusion was 50 years or older. Main Outcome MeasurementsThe primary outcome was failure (defined as early displacement, nonunion, symptomatic avascular necrosis, or deep infection). Secondary outcomes included revision surgery, Timed Up and Go (TUG) test and patient-reported outcome measures (PROMs: EQ-5D and WOMAC). ResultsFor nondisplaced fractures, the incidence of failure was 14% (23/169) in the Pinloc group and 16% (25/156) in the Hansson group. For displaced fractures, the analysis was stratified by age. Patients aged 50-69 years with displaced fractures showed a 2-year failure rate of 44% (17/39) in the Pinloc group versus 44% (16/36) in the Hansson group. For patients 70 years or older with displaced fractures, 33% (7/21) in the Pinloc group versus 22% (4/18) in the Hansson group failed. At 3 and 12 months, no clinically significant differences between treatment groups were found for EQ-5D-3L, WOMAC, or for the TUG in any fracture type or age group. ConclusionsThere were no advantages for Pinloc in any of the studies aspects. Level of evidence1.