Femoral neck stress fractures after trampoline exercise: A case report

BACKGROUND: Femoral neck stress fractures (FNSFs) are commonly found in long-distance running athletes. For FNSFs, early diagnosis and proper treatment are important. The objective of this study was to report FNSFs that occurred after excessive exercise using trampoline in middle-aged women. CASE SUMMARY: The patient was a 43-year-old woman who exercised jumping on a trampoline for 6 wk for 1-3 h a day to diet. Exercise includes repeated flexion-extension of the hip joint. The patient was admitted to the hospital due to sudden bilateral groin pain that occurred suddenly during a trampoline exercise. Hip magnetic resonance imaging (MRI) revealed bilateral FNSFs. After 2 wk of follow-up with conservative treatment, the pain slightly decreased. However, it did not disappear completely. It was determined that it was difficult to control symptoms only by conservation treatment. Thus, closed reduction and internal fixation using a cannulated screw were performed for the more painful left hip joint. After operation, the pain was improved. Walking using crutches was possible. Follow-up MRI showed that the right femoral head signal was decreased compared to the left femoral head signal. Therefore, nonsteroidal anti-inflammatory drug and conservative treatment were provided. CONCLUSION: In middle-aged people, excessive trampoline exercise can repeat hip flexion and extension for a short period of time, leading to FNSFs.