Undisplaced femoral neck fractures need a closed reduction before internal fixation

  • Tatsuya YamamotoEmail author
  • Yoshiomi Kobayashi
  • Hiroaki Nonomiya
Original Article • HIP - FRACTURES



Undisplaced femoral neck fractures (UFNF) are generally treated with in situ internal fixation, and few studies have addressed the impact of closed reduction. The aim of this study was to investigate the clinical outcome of UFNF treated with internal fixation using the Hansson pinloc system after closed reduction.

Patients and methods

This was a retrospective study of 40 patients who underwent internal fixation using the Hansson pinloc system after closed reduction between September 2014 and May 2016. In the present study, posterior tilt, presence of complete fracture, interval from injury to surgery, and changes in activities of daily living were statistically analyzed to investigate the association between nonunion and late segmental collapse (LSC).


Five cases each of nonunion and LSC were identified. The frequency of LSC was significantly higher in patients with preoperative posterior tilt ≥ 20° (p < 0.05). The risks of nonunion and LSC were lower in patients with incomplete fracture (p < 0.05) and fixation within 48 h (p < 0.05). Of the 40 patients, 34 were categorized in the sufficient reduction group fixed with posterior tilt ≤ 5°. Secondary operation rate was lower in the sufficient reduction group (5/34 cases) than in the insufficient reduction group (3/6 cases).


The fixation timing < 48 h decrease the risk of fracture healing complications and sufficient reduction may reduce the risk of secondary operation. Preoperative posterior tilt ≥ 20° and complete fractures on CT scans were related to poor prognosis.


Undisplaced femoral neck fractures Posterior tilt Hansson pinloc system Closed reduction Late segmental collapse Nonunion 



The authors sincerely thank the patients for their participation in this study.

Authors’ contribution

TY collected and interpreted the data and wrote the initial draft of the manuscript. YK analyzed and interpreted the data and also assisted in the preparation of the manuscript. HN designed the study and critically reviewed the manuscript. All authors approved the final version of the manuscript and agreed to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work were appropriately investigated and resolved.

Compliance with ethical standards

Conflict of interest

Tatsuya Yamamoto, Yoshiomi Kobayashi, and Hiroaki Nonomiya declare that there was no conflict of interest regarding this manuscript.

Supplementary material

590_2018_2281_MOESM1_ESM.xlsx (12 kb)
Supplementary material 1 (XLSX 12 kb)


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Copyright information

© Springer-Verlag France SAS, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Orthopaedic SurgerySaiseikai Yokohamashi Tobu HospitalYokohamaJapan
  2. 2.Department of Orthopaedic SurgeryJapanese Red-Cross Shizuoka HospitalShizuokaJapan

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