PMC5458690_01
Anterior posterior pelvic radiograph taken prior to the first surgery.
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F1
Radiographs showed a lateral center-edge angle of 36  and an alpha angle of 83  on the anterior-posterior (AP) and 72  on the frog view (Fig. 1 and 2).
Frog view radiograph taken prior to the first surgery.
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F2
Radiographs showed a lateral center-edge angle of 36  and an alpha angle of 83  on the anterior-posterior (AP) and 72  on the frog view (Fig. 1 and 2).
Follow-up anterior posterior pelvic radiograph taken 3 months after the left hip arthroscopy demonstrating Grade 3 heterotopic ossification on the left side.
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F3
Follow-up radiographs at 3 months after the left hip arthroscopy showed Grade 3 HO on the left side (Fig. 3 and 4).
Follow-up frog view radiograph taken 3 months after the left hip arthroscopy demonstrating Grade 3 heterotopic ossification on the left side.
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F4
Follow-up radiographs at 3 months after the left hip arthroscopy showed Grade 3 HO on the left side (Fig. 3 and 4).
Follow-up radiographs taken 3 months after the right hip arthroscopy showed no heterotopic ossification (Grade 0).
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F5
Follow-up radiographs at 3 months after the right hip arthroscopy showed no HO (Grade 0) (Figure 5).