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Nuclear Medicine and Molecular Imaging
Published in: Nuclear Medicine and Molecular Imaging 1/2017

01-03-2017 | Original Article

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

Authors: Sangwon Han, Minyoung Oh, Seokho Yoon, Jinsoo Kim, Ji-Wan Kim, Jae-Suk Chang, Jin-Sook Ryu

Published in: Nuclear Medicine and Molecular Imaging | Issue 1/2017

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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.
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Metadata
Title
Risk Stratification for Avascular Necrosis of the Femoral Head After Internal Fixation of Femoral Neck Fractures by Post-Operative Bone SPECT/CT
Authors
Sangwon Han
Minyoung Oh
Seokho Yoon
Jinsoo Kim
Ji-Wan Kim
Jae-Suk Chang
Jin-Sook Ryu
Publication date
01-03-2017
Publisher
Springer Berlin Heidelberg
Published in
Nuclear Medicine and Molecular Imaging / Issue 1/2017
Print ISSN: 1869-3474
Electronic ISSN: 1869-3482
DOI
https://doi.org/10.1007/s13139-016-0443-8

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