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. 2022 Feb 5;15:341–354. doi: 10.2147/JPR.S347961

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© 2022 Luan et al.

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Ultrasound-guided PRP injection for ONFH. The low-frequency convex array probe was aligned with the long axis of the affected femoral head (A) and the needle was advanced using anterior longitudinal approach (B). (a) acetabulum; (b) femoral head; (c) femoral neck.