Summary of clinical case (IR- Internal Rotation, Add- Adduction, ER- External Rotation, IFS- Ischiofemoral space).

Table 1: Summary of clinical case (IR- Internal Rotation, Add- Adduction, ER- External Rotation, IFS- Ischiofemoral space).

	Right hip	Left hip
Clinical features	Hip pain with extension to buttock and thigh Pain and limitation in the extremes of movement (mainly IR, Add and ER)	Hip pain with occasional groin pain
Imaging findings	X-Ray: -Crossover sign -Narrowing of the IFS -Sclerosis in the lesser tuberosity MRI: -Narrowing of the IFS-hyper-signal, edema and wasting of the quadratus femoris muscle -Collection in the IFS	X-Ray: -Crossover sign -Narrowing of the IFS MRI: -Narrowing of the IFS -Hyper-signal, edema and wasting of the quadratus femoris muscle
Outcome after surgery	No symptoms at 14 months post-operative	No symptoms at 14 months post-operative