Objective: The aim of this paper was to investigate the mid-term results of a modified Trapdoor procedure that can allow graftingof the femoral head without surgical hip dislocation in the management of patients with osteonecrosis of the femoral head.Methods: 16 hips of 12 patients (7 female, 5 male; mean age = 38.5 ± 10.7) surgically treated by the new modification of Trapdoorprocedure were retrospectively reviewed and included in the study. Based on the Association Research Circulation Osseous(ARCO) classification system, seven hips (43.7%) were stage 2, and nine hips (56.3%) were stage 3. The mean follow-up was 48.4 ±25.7 months (range = 12-107). All the patients were evaluated postoperatively at the 6th week, 3rd month, 6th month, 1st year, andannually thereafter until their final follow-up. Clinical assessment was performed using the Harris Hip scoring (HHS) system,Non-Arthritic Hip score (NAHS) and Visual analogue pain scale (VAS). At the final follow-up, degenerative changes wereexamined according to the Kellgren-Lawrence scale.Results: The mean HHS increased from 53.43 ± 9.0 (range = 36-67) preoperatively to 83.81 ± 6.1 (range = 72-95) at the final follow-up(P < 0,001). The mean NAHS increased from 51.5 ± 8.2 (range = 36.25-61.25) preoperatively to 86 ± 3.2 (range = 81.5-90) (P < 0,001)at the final follow-up. The mean preoperative VAS decreased from 7.85 ± 0.9 (range = 6.45-9.5) to 3.05 ± 0.9 (range = 1.6-5.2) (P
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