• Jun-Ki Moon, Jae Youn Yoon, Chul-Ho Kim, Sun Hyung Lee, Aditya L Kekatpure, Jun Seong Lee, and Pil Whan Yoon.
• Department of Orthopaedic Surgery, University of Ulsan College of Medicine, Asan Medical Center 88, Olympic-Ro 43-Gil, Songpa-Gu, Seoul, 05505, South Korea.
• Arch Orthop Trauma Surg. 2020 Nov 1; 140 (11): 1655-1663.

IntroductionWe aimed to present the clinical outcomes of multiple drilling and multiple matchstick-like bone allograft for large osteonecrotic lesions of the femoral head as a joint-preserving surgery.Materials And MethodsBetween March 2014 and March 2018, 57 patients (77 hips) who underwent multiple drilling and multiple matchstick-like bone allograft for large lesions (≥ 30%) in osteonecrosis of the femoral head (ONFH) were included. Harris hip scores (HHS) and Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) were obtained preoperatively and at the latest follow-up. Plain radiographs were obtained every 3 months. Femoral head collapse ≥ 2 mm was defined as a radiological failure, and conversion to total hip arthroplasty (THA) was regarded as a clinical failure.ResultsAfter exclusion of 5 patients (5 hips) who lost to follow-up, 52 patients (34 men, 18 women; 72 hips) were finally enrolled. The mean follow-up period was 3.4 (range 2-4.5) years. Nineteen hips (28.4%) required conversion to THA at a mean of 21.6 (range 6-42) months postoperatively. In the remaining 53 hips (71.6%) with clinical success, the mean HHS and WOMAC improved from 63 and 31.3 preoperatively to 80.6 and 16.3 at the final follow-up, respectively (p < 0.001). Radiological failure occurred in four hips (6%). The overall failure rate was 31.9% (23/72 hips), and the mean survival duration until failure was 21.2 months (6-42 months). The lesion size, lesion location, and the use of corticosteroids as the cause of ONFH were associated with clinical failure.ConclusionMultiple drilling and multiple matchstick-like bone allograft may be a useful treatment option for alleviating the symptoms in ONFH patients with large lesions who want to preserve their hips.

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