PMC8311847_01
The dislocated fracture line in the right femoral diaphysis on AP X-ray radiography of a 19-year-old male case (A). Six months after the treatment, a healed fracture line and metallic operation material are observed (B). Osteochondroma localized at the level of the right lesser trochanter (shown with black arrows) on both X-rays.
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fig1
The fracture line healed, and the callus formation was present in the X-ray (Figure 1).
The axial hip CT image taken after trauma in the emergency department (before the operation) (A) and control axial CT image after six months from the operation (B). After the treatment, the ischiofemoral distance narrowed and the compression of the quadratus femoris muscle increased on CT (ischiofemoral distance indicated by black arrows). F: Femur, OC: Osteochondroma.
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fig2
Ischiofemoral (IF) distance was obliterated (Figure 2). 
Hip MRI examination of the same patient. Fat saturation FSE T2W axial image (A) and FSE T1W axial image (B). Osteochondroma (asterisk) with a 6 mm cartilage cap that causes severe QFM compression by narrowing the right ischiofemoral distance. Normal ischiofemoral distance and QFM on the left. GM: Gluteus maximus, TI: Tuber ischium, QFM: Quadratus femoris muscle, F: Femur.
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fig3
In comparison of old and new images, it was observed that the IF distance was narrower before fracture surgery and increased significantly after fracture reduction and healing (Figure 3).
PMC8311847_02
The hip MRI of the 32-year-old female patient. FSE T1W axial image (A) and fat saturation FSE T2W axial image (B). Osteochondroma (asterisk) causing severe QFM compression by narrowing the ischiofemoral distance on the right. Normal ischiofemoral distance and QFM (shown by black line and arrow) on the left. GM: Gluteus maximus, TI: Tuber ischium, QFM: Quadratus femoris muscle, F: Femur.
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fig4
The fat replacement resulting from atrophy was present (Figure 4-5).
Coronal plane hip MRI images of the same patient. FSE T1W (A) and fat saturation FSE T2W (B). Osteochondroma (shown with black arrows) containing a 4 mm cartilage cap (asterisk) that creates QFM compression by narrowing the ischiofemoral distance on the right. Normal ischiofemoral distance on the left. F: Femur.
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fig5
The fat replacement resulting from atrophy was present (Figure 4-5).