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Table 1 Characteristics of the included studies

From: Fibula allograft propping as an effective treatment for early-stage osteonecrosis of the femoral head: a systematic review

StudyStudy designTotal hips/stage of hipsSex (F/M)Mean age (year)Mean follow-up (month)
Wei et al. 2011 [19]Prospective, noncontrolled study223
IIA, 10
IIB, 61
IIC, 63
IIIA, 89
61/10133.5 (19–54)24
Zeng et al. 2015 [20]Retrospective, noncontrolled study18
IIB, 5
IIC, 13
3/1540.7 (22–49)53.3
Wu et al. 2018 [21]Retrospective, noncontrolled study29
IIA, 9
IIB, 13
IIC, 4
IIIA, 3
7 (hips)/22 (hips)38.9 (24–58)168
Cao et al. 2018 [22]Prospective randomized trialII, 12
III, 17
10/1737.6 (20–62)41.1
II, 13
III, 13
8/1836.9 (18–60)43.9
Feng et al. 2019 [23]Retrospective cohort studyIIA, 12
IIB, 28
IIC, 19
IIIA, 4
IIIB, 4
IIIC, 2
39/3031.5 (21–45)84
IIA, 3
IIB, 5
IIC, 5
IIIA, 18
IIIB, 18
IIIC, 20