To appreciate why this case matters, it helps to understand what the triradiate cartilage actually is. In children and adolescents, the acetabulum, the socket of the hip joint, is not yet a single piece of bone. Instead, it forms at the junction of three pelvic bones, the ilium, the ischium and the pubis, which meet in the middle at a Y-shaped slab of growth cartilage called the triradiate cartilage. This structure functions like a growth plate, or physis, allowing the acetabulum to expand and remodel as the child grows, ultimately shaping the socket that will house the femoral head for a lifetime. Like all growth plates, it is made of cartilage rather than bone, which makes it mechanically vulnerable in ways that mature skeletons are not. Growth plates are often the weakest link in a child’s skeleton, and forces that would merely bruise muscle in an adult can crack or shear the cartilaginous zones where bone is still forming.

Acute traumatic injuries of the triradiate cartilage are exceedingly uncommon. According to the authors, they typically occur in the setting of high-energy trauma, such as motor vehicle collisions or falls from significant height, and they are almost always accompanied by other pelvic fractures that draw clinical attention. The literature contains only two previously reported sports-related cases of complete triradiate cartilage injuries, making any new case in this category a genuine rarity. What sets the Lille report apart is twofold: the injury was partial rather than complete, and it followed low-energy trauma in a young athlete, a combination that had never been documented before. The fracture was confined to a single arm of the Y-shaped cartilage, specifically the ilioischial synchondrosis, the junction between the ilium and the ischium, while the rest of the triradiate cartilage and the corresponding structure on the opposite side of the pelvis had already fused.

The clinical presentation was strikingly subtle. The 14-year-old patient arrived with sudden-onset hip pain and only moderate functional impairment, a picture that could easily be mistaken for a muscle strain, a hip pointer, or one of the more common apophyseal injuries that plague adolescent athletes. In growing athletes, sudden hip and pelvic pain most often involves avulsion injuries at sites where strong tendons attach to bone, such as the anterior superior iliac spine or the ischial tuberosity. A partial injury buried within the triradiate cartilage would not be high on most differential diagnoses, precisely because it has never been described in this context. The case therefore serves as a caution against anchoring on familiar diagnoses when the clinical picture does not quite fit, particularly in adolescents whose growth plates remain open.

Imaging was the key to unraveling the mystery. Magnetic resonance imaging suggested the diagnosis by revealing abnormalities within the ilioischial portion of the triradiate cartilage, and a subsequent computed tomography scan confirmed the fracture. This two-step imaging pathway reflects the complementary strengths of the two modalities. MRI excels at visualizing cartilage itself, detecting marrow edema, cartilaginous disruption and soft-tissue changes that plain radiographs simply cannot show. CT, by contrast, provides exquisite bony detail and can delineate fracture lines, fragment displacement and the precise relationship of the injury to the remaining growth cartilage. In a structure as small and geometrically complex as the triradiate cartilage, where three synchondroses converge at the center of the acetabulum, having both modalities available proved decisive in establishing a diagnosis that had never before been made.

The rarity of the finding also highlights the biology of pelvic maturation. The triradiate cartilage fuses at a variable age, typically in the mid-to-late teenage years, and the three arms may close at slightly different times. In this patient, the fact that the injury was confined to the ilioischial synchondrosis while the remaining triradiate cartilage was fused suggests that the ilioischial segment was the last to remain open, and therefore the only portion still mechanically vulnerable. Forensic radiology research, including studies of the ischiopubic, ilioischial and iliopubic synchondroses on CT images, has documented this staggered pattern of closure, which is one reason skeletal age estimation can rely on these structures. In the Lille case, that asymmetric maturation created a narrow window of vulnerability that a modest traumatic force was able to exploit.

Why does any of this matter beyond the novelty of a first case report? The answer lies in the long-term consequences that growth plate injuries can produce. Damage to the triradiate cartilage is not just an acute problem; it can disrupt the growth and remodeling of the acetabulum, potentially leading to a shallow or dysplastic hip socket, altered biomechanics and premature osteoarthritis decades later. Classic studies of acetabular triradiate physeal injuries, including work by Bucholz, Ezaki and Ogden in the 1980s, established that these injuries, though rare, can cause growth arrest and secondary acetabular dysplasia. A partial injury that goes unrecognized might heal in a malaligned fashion or trigger asymmetric closure of the remaining cartilage, quietly reshaping the hip socket during the very years when the joint is still developing. Early recognition therefore opens the door to appropriate monitoring, activity modification and follow-up imaging that could protect the long-term health of the joint.

The case also fits into a broader and growing awareness of cartilage vulnerability in adolescent athletes. Previous reports have described bilateral triradiate cartilage injury as an overuse syndrome in an adolescent football player, suggesting that repetitive loading, not just acute trauma, can stress this structure. The new report extends that spectrum by showing that even a single low-energy traumatic event can partially injure the cartilage when only one segment remains open. As youth sports participation intensifies and training loads increase, clinicians in sports medicine, emergency medicine and pediatrics may encounter presentations like this one more often than the historical literature would suggest. The authors’ conclusion is direct: the triradiate cartilage should be carefully evaluated on imaging in young athletes with sudden-onset hip pain, even when the cartilage remains only partially open on one side.

For the practicing clinician, the practical takeaway is a matter of imaging strategy and diagnostic vigilance. Plain radiographs of the pelvis in adolescents are notoriously difficult to interpret around the triradiate cartilage because the cartilage itself is radiolucent and overlying bone shadows obscure the region. When sudden-onset hip pain in a skeletally immature athlete does not correspond to a recognizable muscle or apophyseal injury, MRI becomes the logical next step, with the triradiate cartilage explicitly included in the search pattern. CT can then be reserved for characterizing any suspected fracture. The Lille team’s report, received in August 2026 and published in October 2026, adds a new entity to the differential diagnosis of adolescent hip pain and reminds the medical community that even the rarest structures in the skeleton can fail under the mildest of forces when growth leaves them exposed. For a 14-year-old athlete, that insight may make the difference between a hip that develops normally and one that carries the hidden cost of an injury nobody thought to look for.

Subject of Research: Partial traumatic injury of the acetabular triradiate cartilage in an adolescent following low-energy trauma

Article Title: Partial injury of the triradiate cartilage following low-energy trauma

Article References: Abidi, S., Kaadi, L., De Leeuw, A., Cotten, A., Fron, D., & Boutry, N. (2026). Partial injury of the triradiate cartilage following low-energy trauma. Pediatric Radiology. https://doi.org/10.1007/s00247-026-06798-6

Image Credits: AI Generated

DOI: 10.1007/s00247-026-06798-6

Keywords: triradiate cartilage, pediatric radiology, hip pain, adolescent athlete, growth plate injury, magnetic resonance imaging, computed tomography, acetabulum, pelvic trauma, sports injury, orthopedics, cartilage

The clinical stakes of this research are considerable. Distal humeral physeal separation occurs almost exclusively in immature elbows, typically the result of birth trauma, accidental injury, or—critically—non-accidental trauma. Because the ligaments and joint capsule of a young child’s elbow are stronger than the growth plate cartilage itself, twisting or pulling forces tend to fail through the physis rather than dislocating the joint. True elbow dislocation is exceedingly rare in infants, which means that when a radiograph shows the forearm displaced relative to the humerus, a physeal separation should be the leading consideration. The injury also carries a strong association with child abuse, and its radiographic recognition may be the first clue of unsuspected abuse when the history provided is absent or inconsistent. A missed or delayed diagnosis can lead to permanent growth disturbance and lasting elbow deformity.

The challenge for clinicians is that the diagnostic toolkit is limited at the point of first contact. Ultrasound and magnetic resonance imaging can directly visualize the unossified chondroepiphyses, but these modalities are usually deployed only after the injury is already suspected. Ultrasound is portable and well tolerated by neonates without sedation but is highly operator-dependent, while MRI is constrained by availability and the need for immobilization. Plain radiographs remain the first-line imaging modality for evaluating elbow symptoms in children, yet the abundance of cartilage in the immature elbow makes confident interpretation notoriously difficult. Prior literature on this injury consisted largely of case reports and small retrospective series describing posterior or medial displacement of the radius and ulna relative to the distal humerus, without a controlled comparison against normal elbows.

To fill that gap, the research team searched their institution’s electronic imaging archive for all elbow and forearm radiographs performed in children three years of age or younger over a 16-year period, from January 2008 to December 2024. The initial search yielded 311 examinations, reduced to 259 unique studies after excluding incomplete or unavailable imaging. Reports containing terms such as physeal fracture, physeal separation, or transphyseal fracture of the distal humerus were flagged, and the complete medical records were then reviewed for clinical, imaging, or surgical confirmation of the injury. After rigorous exclusion of normal studies, forearm fractures, supracondylar and metaphyseal fractures, congenital abnormalities, dislocations, condylar fractures, and infections, 19 children with confirmed distal humeral physeal separation formed the study group. A comparison group of 32 age- and sex-matched children without elbow fracture was drawn from the same source population, whose imaging indications ranged from evaluation of congenital or syndromic abnormalities to accidental household trauma and birth-related trauma.

Two board-certified radiologists, one with more than 20 years of experience in pediatric radiology and the other with 11 years spanning pediatric and musculoskeletal imaging, independently reviewed all examinations. They were blinded to group assignment, clinical history, and prior reports, and disagreements were resolved by consensus. For each study, they recorded the presence or absence of soft-tissue swelling on both anteroposterior and lateral views, elbow joint effusion assessed by elevation of the anterior fat pad—the so-called sail sign—or visibility of the posterior fat pad, abnormal ossific fragmentation, and abnormal medial or posterior alignment of the forearm relative to the distal humerus. In children who had developed a capitellar ossification center, the radiocapitellar alignment and the anterior humeral line were also assessed. Inter-rater agreement was substantial to near perfect for most findings, with kappa values ranging from 0.68 to 0.95, although elbow effusion showed only slight agreement at 0.24.

The final cohort comprised 51 children—32 boys and 19 girls—with a median age of just 17 days and a range spanning from birth to 1,186 days. Among the 19 children with physeal separation, birth-related injury was the most common mechanism, accounting for 10 cases, followed by accidental injury in 6 and non-accidental trauma in 3. The median age at diagnosis varied strikingly by mechanism: 3.5 days for birth trauma, 101 days for accidental trauma, and 329 days for non-accidental injury. Most children were treated with closed reduction and percutaneous pinning, while the remainder were managed with immobilization, in one case augmented by external traction. Follow-up data, available for 18 children with a median of 94 days, revealed a sobering reality: more than half had residual limitations in elbow motion, and a minority developed cubitus varus, an inward angulation deformity of the arm.

The imaging results were dramatic. Soft-tissue swelling was present in 94.7 percent of injured elbows on anteroposterior views versus 34.4 percent of controls, and in 78.9 percent versus 12.5 percent on lateral views, differences that were highly statistically significant. Abnormal ossific fragmentation appeared in 78.9 percent of the separation group compared with just 3.1 percent of controls. Most striking of all, abnormal medial forearm alignment was seen in 89.5 percent of children with physeal separation and in exactly zero controls, while abnormal posterior alignment was present in 78.6 percent of the injured group and, again, in no control child. In univariable analysis, medial alignment carried an odds ratio of 455, posterior alignment 213.5, and ossific fragmentation 72.3. But when the researchers applied Firth penalized logistic regression—a method chosen to reduce the small-sample bias that plagues standard logistic regression with sparse data—only abnormal medial forearm alignment remained independently associated with the injury, with an odds ratio of 104.2.

The study also illuminated several technical pitfalls that complicate diagnosis in this population. Elbow effusion, a classic sign of intra-articular injury in older children, proved unreliable here: it was uncommon even among injured children and showed the poorest agreement between readers. The authors explain that in very young children the anterior coronoid and posterior olecranon fossae are underdeveloped, making it difficult to distinguish physiologically prominent fat pads from the pathologic displacement that signals an effusion. Positioning posed another obstacle. Among the 16 children with capitellar ossification, three had suboptimally positioned lateral views that precluded assessment of the radiocapitellar line and anterior humeral line, and the injured group was particularly prone to poor positioning—possibly because additional rotation across the injured physis makes standard views harder to obtain. Among children with adequate lateral views, an abnormal anterior humeral line was present in all children with separation and none of the controls, though the small evaluable subgroup prevented its inclusion in the regression models.

The pattern of ossific fragmentation added further nuance. Fragments in the injured group were distributed relatively evenly across the medial, posteromedial, and posterior distal humerus, mirroring the predominance of medial and posterior displacement. The authors note that some of these appearances likely represented early accessory ossification of the capitellum—the first secondary ossification center to mineralize in the elbow, typically between one and two years of age—that was overcalled as pathology in the presence of an effusion. Only a minority of children had capitellar ossification at all, underscoring the extreme skeletal immaturity of this cohort. Even when the capitellum is present, its small and often irregular early ossification makes confident assessment of the radiocapitellar line and anterior humeral line challenging, since the line drawn along the radial shaft can miss the capitellum in a substantial fraction of normal young elbows, and the anterior humeral line may transect only the anterior third of the immature ossification center in up to 40 percent of children under four.

The authors are candid about their limitations. The retrospective design restricted the clinical information available and precluded repeat imaging, and despite being the largest single-institution cohort reported to date, the sample of 19 cases remains small—a consequence of the injury’s rarity. That small size likely inflated the apparent discriminative power of medial alignment, and the final model’s area under the curve of 1.00, with 100 percent sensitivity and specificity, almost certainly reflects overfitting rather than true performance, the researchers caution. The comparison group, drawn from children imaged for syndromic workups or injury exclusion, may not be entirely normal, though the authors argue this better reflects routine clinical practice. Even so, the central message stands with unusual clarity: in an infant or toddler whose elbow radiograph shows the forearm displaced medially relative to the distal humerus, distal humeral physeal separation should be presumed until proven otherwise, prompting urgent further imaging with ultrasound or MRI, orthopedic referral, and—in cases where the history does not fit—careful consideration of non-accidental trauma. Future prospective studies incorporating comparison views of the asymptomatic side could refine these criteria and help prevent the treatment delays and growth disturbances that have shadowed this elusive injury for decades.

Subject of Research: Radiographic diagnosis of distal humeral physeal separation in infants and toddlers

Article Title: Distal humeral physeal separation: radiographic findings in infants and toddlers

Article References: Yaya-Quezada, C., Nguyen, J. C., Forero-Millan, J., Hailu, S. S., Lerebo, W. T., & Taragin, B. H. (2026). Distal humeral physeal separation: radiographic findings in infants and toddlers. Pediatric Radiology. https://doi.org/10.1007/s00247-026-06790-0

Image Credits: AI Generated

DOI: 10.1007/s00247-026-06790-0

Keywords: distal humeral physeal separation, pediatric radiology, elbow fracture, growth plate injury, infants, toddlers, radiography, child abuse, birth trauma, forearm alignment, elbow effusion, ossific fragmentation