Abstract:[Objective] To compare the clinical outcome of core decompression with or without fibula allograft in the treatment of osteo-necrosis of the femoral head (ONFH). [Methods] A retrospective study was done on the patients who received hip preservation treatment forONFH in our hospital from June 2018 to June 2020. According to the results of doctor-patient communication, 43 cases were treated withcore decompression with fibular allograft support (supported group), while other 27 cases were treated with core decompression only (unsup-ported group). The data of perioperative period, follow-up and imaging were compared between the two groups. [Results] Although the sup-ported group was significantly inferior to the unsupported group in terms of operating time [(55.1±9.2) min vs (40.3±10.3) min, P<0.001), to-tal length of incision [(5.5±0.6) cm vs (3.1±0.7) cm, P<0.001], intraoperative blood loss [(33.7±5.0) ml vs (30.9±4.6) ml, P=0.022], and intra-operative fluoroscopy times [(4.2±1.0) vs (3.6±1.0), P=0.017], the former was significantly superior to the latter in terms of incision healinggrade [case, A/B/C, (30/10/3) vs (10/9/8), P=0.010], ambulation time postoperatively [(3.4±0.4) days vs (4.6±0.7) days, P<0.001] and hospital-ization [(4.8±0.9) days vs (7.1±1.3) days, P<0.001]. As time went in the follow-up period lasted for 24 months, the ARCO grade, bone edemaand joint effusion signs significantly improved (P<0.05), while the Tonnis stage remained unchanged (P>0.05) in the supported group. How-ever, there were no significant changes in the abovesaid items in the unsupported group (P>0.05). There was no significant difference in theabove indexes before and 6 months after surgery between the two groups (P>0.05). At 24 months after surgery, the supported group provedsignificantly superior to the unsupported group in terms of ARCO classification [case, I/II/III/IV, (29/12/2/0) vs (11/10/6/0), P= 0.030], boneedema [case, <15%/15%~30%/≥30%, (34/8/1) vs (14/10/3), P=0.044] and joint effusion [case, 0/1/2/3, (30/11/2/0) vs (10/14/3/0), P=0.026].[Conclusion] For hip preservation treatment of ONFH, core decompression combined with allogenic fibula support has obvious advantagesand achieves satisfactory clinical results.