A rare case of avulsion fracture of the iliac crest apophysis in a young male patient: a case report

The human skeleton is not a static structure of bone and mortar; it is a living, growing framework that changes shape throughout childhood and adolescence. In teenagers, the ends of many bones are capped with soft, cartilage-like growth plates called apophyses. These are the specific spots where powerful muscles and tendons attach to the bone. Because this cartilage is softer than the bone itself, it can sometimes be the weakest link in the chain. When a young athlete makes a sudden, explosive movement—like sprinting, jumping, or kicking—the force of the muscle pulling on the bone can sometimes be strong enough to rip a piece of the growth plate away entirely. This is known as an avulsion fracture. While these injuries are well-known in areas like the hip and knee, they are exceptionally rare in one specific location: the top ridge of the pelvis, known as the iliac crest. Because this injury is so uncommon and the growth plate in this area does not harden into bone until late in adolescence, doctors often struggle to recognize it quickly, sometimes missing the diagnosis or treating it incorrectly.

A team of surgeons at the Technical University of Munich recently shared the story of a sixteen-year-old boy who suffered just such a rare injury. The teenager arrived at the emergency room with severe pain in his right hip after a skiing accident. He had fallen and taken a direct hit to his pelvic region, leaving him unable to stand or move his leg without agony. When the doctors examined him, they found extreme tenderness along the top of his right hip bone, but his hip joint itself seemed fine. Standard X-rays revealed the problem: a large piece of the iliac crest had been torn off and was sitting more than three centimeters away from where it belonged. To get a clearer picture of the damage, the team used a computerized tomography scan, which showed that the fragment was actually quite long, stretching over five centimeters along the top of the pelvis. A magnetic resonance imaging scan confirmed that the surrounding soft tissues were swollen but that the injury was isolated to the bone and its growth plate, with no damage inside the hip joint.

In many cases of this type of injury, doctors would simply advise rest and pain management, allowing the body to heal on its own. However, the surgeons decided that this patient's situation was different. The fragment was displaced too far to heal correctly without help, and the boy was in constant pain. They chose to perform surgery to bring the bone back into place. Under general anesthesia, the team made an incision along the hip, carefully moving aside the muscles and connective tissues to reach the broken piece. They found that the muscles attached to the fragment were still intact, but the bone itself had been sheared off. Using a gentle lever technique while bending the boy's hip, they coaxed the large bone fragment back to its original position. Once aligned, they held it steady with temporary wires and then secured it permanently with three small screws. The surgeons took great care to rebuild the layers of muscle and tissue that had been moved, ensuring the area was stable.

The recovery process was swift and successful. For the first six weeks after the operation, the boy was allowed to put only partial weight on his leg and was restricted from certain movements to let the bone knit together. By the time he returned for a check-up six weeks later, his pain had dropped significantly, and he could bend his hip almost fully. Over the next few months, he gradually increased his activity level. By three months, he was moving his hip freely without pain and had returned to his normal sports. At an eight-month follow-up, he reported no pain at all and was participating in all his athletic activities without limitation. X-rays taken at this final stage showed that the bone had healed completely, with the screws holding the fragment firmly in place and only minor, harmless new bone formation visible near the surgical site.

This case illustrates that while avulsion fractures of the iliac crest are rare and often difficult to diagnose, they can be treated effectively with surgery when the broken piece is significantly displaced. The surgeons noted that the boy's quick return to full activity was likely due to the precise reattachment of the bone and the early stability provided by the screws. While the standard approach for less severe cases remains rest and physical therapy, this report suggests that for young, active patients with large gaps between the bone fragments, surgical fixation offers a reliable path to a full recovery. The authors emphasize that because this injury is so uncommon, more studies are needed to define exactly how much displacement warrants surgery, but in this instance, the decision to operate allowed the teenager to heal faster and return to his life without long-term limitations.