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Fig. 4 | BMC Musculoskeletal Disorders

Fig. 4

From: Multiple drilling is not effective in reducing the rate of conversion to Total hip Arthroplasty in early-stage nontraumatic osteonecrosis of the femoral head: a case-control comparative study with a natural course

Fig. 4

A Survival analysis of conversion to THA between patients who underwent multiple drilling combined with and without autogenous bone grafting (P = .373, Kaplan-Meier method with log-rank test). Depending on the different extent of necrotic lesion in ONFH patients who underwent multiple drilling, B the survival analysis showed a significant difference in patients with necrotic lesion < 15% (P = .007) and no significant difference in patients with necrotic lesion of 15–30% (C) or > 30% (D) (P = .453 and .657, respectively)

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