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Table 3 Characteristics of included control studies

From: Vascularized pedicle iliac bone grafts as a hip-preserving surgery for femur head necrosis: a systematic review

Year/author Study design Number of patients/hips (follow-up) Average age (years) Gender (M/F) Initial AVN class (hips) AVN etiology (patients/hips) Follow-up time (years) /rate Validity of the studies
TIG Other TIG Other TIG Other TIG Other TIG Other TIG Other
2016/Zhao/Chinaa [21] RCT 23/23 25/25 30 ± 7 33 ± 8 14/9 15/10 ARCO: IIA (4)/IIB (5)/IIC (4)/IIIA (4)/IIIB (4)/IIIC (2) ARCO: IIA (5)/IIB (5)/IIC (3) IIIA (5)/IIIB (4)/IIIC (3) Steroid (7 patients)/alcohol (7)/others (9) Steroid (9 patients)/alcohol (5)/others (11) 1/100% 1/100% Additional file 1: Appendix 2
2006/Yen/Chinab [22] Case-control 33/39 22/22 40 (26–63) 38 (28–52) 30/3 20/2 Steinberg: II (11)/III (12)/IV (16) Steinberg: II (4)/III (11)/IV (7) Steroid (1 patient)/alcohol (15)/idiopathic (17) Steroid (1 patient)/alcohol (12)/idiopathic (9) > 4/NA > 3/NA Additional file 1: Appendix 2
2003/Hasegawa/Japan+c [23] Case-control 26/31 63/77 37.9 (25–53) 39 (19–64) 23/3 44/19 Ficat and Arlet: II (28)/III (3) JIC classification: IB (1)/IC (25)/II (4)/III (1) Ficat and Arlet: II (34)/III (43) JIC classification: IB (3)/IC (62)/II (12) Steroid (8 hips)/alcohol (16)/idiopathic (7) Steroid (46 hips)/alcohol (24)/idiopathic (7) 13 (10–15)/3.84% 7 (5–11)/3.07% Additional file 1: Appendix 2
  1. TIG target intervention group, other other treatments as a control group for the target intervention group, NA not available
  2. aTIG refers to the Mg screw group (vascularized bone grafting fixed by Mg screws), and other treatments refer to vascularized bone grafting without fixation as a control group
  3. bTIG refers to vascularized iliac pedicle bone grafting, and other treatments refer to free vascularized fibula bone grafting
  4. cTIG refers to vascularized iliac pedicle bone grafting, and other treatments refer to transtrochanteric rotational osteotomy