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Fig. 3 | BMC Musculoskeletal Disorders

Fig. 3

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. 3

A Survival analysis of conversion to THA between patients who underwent multiple drilling and patients with a natural course of osteonecrosis progression. The difference was not statistically significant. (Kaplan-Meier method with long-rank test P = .191). Depending on the different extent of necrotic lesion, patients receiving multiple drilling showed near significant difference on survival rate in patients with necrotic lesion < 15% (B). However, neither extent of necrotic lesion of 15–30% (C) nor necrotic areas > 30% (D) with multiple drilling had an influence on conversion to THA compared to patients with natural course (P = .227, .995, respectively)

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