AIIS Avulsion Fracture: Groin Pain After a Kick

AIIS avulsion fracture (Anterior Inferior Iliac Spine) is a typical avulsion injury in the adolescent soccer player. It occurs when the rectus femoris muscle of the quadriceps contracts with extreme power — particularly during a missed kick, a powerful shot or a sudden knee extension — and tears off a bone fragment from its insertion on the pelvis.

Here too the mechanism is age-related: in the adolescent, the tendon insertion on the bone is still maturing and gives way before the muscle. Pain is sudden, localized in the anterior groin region, and the athlete often describes a clear sensation of "tearing" during the gesture.

After first aid and an accurate clinical evaluation, a targeted X-ray confirms the diagnosis and shows any fragment displacement. The path is almost always conservative — rest, unloading, progressive recovery of mobility and a return-to-sport program built around the specific sports gesture, especially for young soccer players who will need to kick with power again.

⚠️ Evaluate within 5–7 days: do not delay. An orthopaedic evaluation within the first 5–7 days of the trauma allows accurate documentation of the avulsion, the right choice among the available treatment options, and the immediate setup of the appropriate workload — keeping the window for early surgery open as well in the rare cases of large displacement.