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Nuclear Medicine and Molecular Imaging

, Volume 51, Issue 1, pp 49–57 | Cite as

Risk Stratification for Avascular Necrosis of the Femoral Head After Internal Fixation of Femoral Neck Fractures by Post-Operative Bone SPECT/CT

  • Sangwon Han
  • Minyoung Oh
  • Seokho Yoon
  • Jinsoo Kim
  • Ji-Wan Kim
  • Jae-Suk Chang
  • Jin-Sook RyuEmail author
Original Article

Abstract

Purpose

Avascular necrosis (AVN) of the femoral head is a major complication after internal fixation of a femoral neck fracture and determines the functional prognosis. We investigated postoperative bone single-photon emission computed tomography/computed tomography (SPECT/CT) for assessing the risk of femoral head AVN.

Methods

We retrospectively reviewed 53 consecutive patients who underwent bone SPECT/CT within 2 weeks of internal fixation of a femoral neck fracture and follow-up serial hip radiographs over at least 12 months.

Results

Nine patients developed femoral head AVN. In 15 patients who showed normal uptake on immediate postoperative SPECT/CT, no AVN occurred, whereas 9 of 38 patients who showed cold defects of the femoral head later developed AVN. The negative predictive value of immediate postoperative SPECT/CT for AVN was 100 %, whereas the positive predictive value was 24 %. Among 38 patients with cold defects, 1 developed AVN 3 months postoperatively. A follow-up bone SPECT/CT was performed in the other 37 patients at 2–10 months postoperatively. The follow-up bone SPECT/CT revealed completely normalized femoral head uptake in 27, partially normalized uptake in 8, and persistent cold defects in 2 patients. AVN developed in 3.7 % (1/27), 62.5 % (5/8), and 100 % (2/2) of each group, respectively.

Conclusions

According to the time point of imaging, radiotracer uptake patterns of the femoral head on postoperative bone SPECT/CT indicate the risk of AVN after internal fixation of femoral neck fractures differently. Postoperative bone SPECT/CT may help orthopedic surgeons determine the appropriate follow-up of these patients.

Keywords

Bone SPECT/CT Avascular necrosis Femoral neck fracture Internal fixation 

Notes

Compliance with Ethical Standards

Conflict of Interest

Sangwon Han, Minyoung Oh, SeokhoYoon, Jinsoo Kim, Ji-Wan Kim, Jae-Suk Chang, and Jin-Sook Ryu declare that they have no conflicts of interest.

Ethical Statement

All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This study was approved by our Institutional Review Board (IRB no. 2016–0231). The Institutional Review Board waived the need to obtain informed consent. This manuscript has not been published before or is not under consideration for publication anywhere and has been approved by all co-authors.

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Copyright information

© Korean Society of Nuclear Medicine 2016

Authors and Affiliations

  • Sangwon Han
    • 1
  • Minyoung Oh
    • 1
  • Seokho Yoon
    • 1
  • Jinsoo Kim
    • 2
  • Ji-Wan Kim
    • 3
  • Jae-Suk Chang
    • 2
  • Jin-Sook Ryu
    • 1
    Email author
  1. 1.Department of Nuclear Medicine, Asan Medical CenterUniversity of Ulsan College of MedicineSeoulRepublic of Korea
  2. 2.Department of Orthopedic Surgery, Asan Medical CenterUniversity of Ulsan College of MedicineSeoulRepublic of Korea
  3. 3.Department of Orthopedic Surgery, Haeundae Paik HospitalInje UniversityBusanRepublic of Korea

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