TY - JOUR
T1 - Patterns of isotope uptake in sequential postoperative bone scan in undisplaced femoral-neck fractures
AU - Yoon, Byung Ho
AU - Kim, Young Woong
AU - Yoon, Hyung Ku
PY - 2013/8
Y1 - 2013/8
N2 - Purpose: We aimed to investigate the changing pattern of isotope uptake in the sequential bone scan test for the prediction of osteonecrosis of the femoral head in patients with an undisplaced femoral-neck fracture. Methods: Fifty-four cases of sequential bone scan for nondisplaced femoral-neck fracture treated by internal fixation with cannulated screws between 2000 and 2009 were retrospectively studied. The mean follow-up period was 4.2 years. The first postoperative bone scan was performed two weeks postoperatively in all patients. Second, third, and fourth follow-up bone scans were performed at one to six months, 12-18 months, and 18-24 months postoperatively. Results: Mean femoral-head ratio (FHR) in the first postoperative bone scan was 0.99. Although it was under 1.0 in 38 patients (70.4 % of the 54 patients), only one patient developed osteonecrosis of the femoral head. The others showed hot uptake in their second follow-up bone scan. Mean FHRs in the second, third, and fourth postoperative bone scans were 1.69, 1.29, and 1.05, respectively, and there were significant statistical differences in each follow-up period (P = 0.035). In addition, there were unique patterns of isotope uptake with the passage of time, such as cold uptake in the early stage, hot uptake in a couple of months, and iso-uptake in the late stage. Conclusions: Early postoperative bone scan results should not be over interpreted when predicting osteonecrosis of the femoral head.
AB - Purpose: We aimed to investigate the changing pattern of isotope uptake in the sequential bone scan test for the prediction of osteonecrosis of the femoral head in patients with an undisplaced femoral-neck fracture. Methods: Fifty-four cases of sequential bone scan for nondisplaced femoral-neck fracture treated by internal fixation with cannulated screws between 2000 and 2009 were retrospectively studied. The mean follow-up period was 4.2 years. The first postoperative bone scan was performed two weeks postoperatively in all patients. Second, third, and fourth follow-up bone scans were performed at one to six months, 12-18 months, and 18-24 months postoperatively. Results: Mean femoral-head ratio (FHR) in the first postoperative bone scan was 0.99. Although it was under 1.0 in 38 patients (70.4 % of the 54 patients), only one patient developed osteonecrosis of the femoral head. The others showed hot uptake in their second follow-up bone scan. Mean FHRs in the second, third, and fourth postoperative bone scans were 1.69, 1.29, and 1.05, respectively, and there were significant statistical differences in each follow-up period (P = 0.035). In addition, there were unique patterns of isotope uptake with the passage of time, such as cold uptake in the early stage, hot uptake in a couple of months, and iso-uptake in the late stage. Conclusions: Early postoperative bone scan results should not be over interpreted when predicting osteonecrosis of the femoral head.
UR - http://www.scopus.com/inward/record.url?scp=84881238487&partnerID=8YFLogxK
U2 - 10.1007/s00264-013-1983-5
DO - 10.1007/s00264-013-1983-5
M3 - Article
C2 - 23812576
AN - SCOPUS:84881238487
SN - 0341-2695
VL - 37
SP - 1541
EP - 1545
JO - International Orthopaedics
JF - International Orthopaedics
IS - 8
ER -