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

The scale of the underlying problem is considerable. In the United Kingdom, approximately one in 20 women develop post-traumatic stress disorder following childbirth, a condition that can flashbacks, nightmares, avoidance behaviours and severe anxiety to persist for months or years after delivery. Many more women describe their birthing experience as traumatic even when they do not meet full diagnostic criteria, and recent research has shown that postnatal PTSD remains substantially underdiagnosed across the UK, meaning many affected women never receive formal recognition or treatment for their suffering. The new economic analysis adds a powerful financial dimension to this clinical picture, demonstrating that the hidden burden of birth trauma translates directly into increased demand on health services and, by extension, on the public purse, strengthening the case for earlier identification and intervention.

The report was authored by the MAP Alliance research team and represents the first published attempt to estimate some of the economic costs associated with PTSD following childbirth in the UK, with a primary focus on healthcare use among affected women. Its evidence base is unusually robust for this field: the analysis draws on a programme of perinatal mental health research that tracked more than 2,000 women in England and Scotland from pregnancy through to two years after birth, repeatedly assessing their mental health, their use of health services and their occupational outcomes. Crucially, the postnatal assessments captured not only PTSD arising from childbirth itself but also PTSD stemming from other traumatic experiences, allowing the researchers to distinguish between trauma related specifically to the birth and trauma from other sources. The report also incorporates findings from a separate survey conducted by the Birth Trauma Association documenting women’s personal accounts of birth trauma and its effects on their lives.

The key findings are stark. Healthcare and support service costs for women with childbirth-related PTSD were 2.5 times higher than for women without PTSD during the six to twelve months after birth. Even women with low or moderate PTSD symptoms, including those reporting only one or two symptoms, showed increased healthcare service costs compared with women without PTSD, demonstrating that the economic impact of birth trauma begins well below the diagnostic threshold. Employment outcomes were also affected: by twelve months postpartum, only 53 percent of women with PTSD had returned to work, compared with 68 percent of women without symptoms, pointing to longer-term economic and employment consequences that extend far beyond the health service. Although women with PTSD were more likely to be referred to mental health support services, more than half received no referral at all, exposing serious gaps in access to appropriate care. Women whose PTSD stemmed from traumatic birth also had slightly higher healthcare costs than those with PTSD arising from other traumas, suggesting greater healthcare needs in this group.

The findings arrive against the backdrop of mounting concern about maternity safety and accountability. The 2024 APPG Birth Trauma Inquiry, co-chaired by Rosie Duffield MP, highlighted the significant impact of birth trauma on women and families and explicitly called for research evidence on the public health and wider societal costs of postpartum PTSD. That call has now been answered with hard numbers. The wider medico-legal context is equally sobering: maternity-related clinical claims against the NHS in 2024-25 cost £3.5 billion, representing 53 percent of all clinical claims by value received in that year. While the new report deliberately restricted its scope to healthcare use, the researchers acknowledge that substantial additional costs fall outside its estimates, including lost productivity, informal care, family breakdown and the long-term effects on children, meaning the true economic burden is likely to be considerably larger than the figures presented.

Professor Susan Ayers, co-author of the report and Professor of Maternal and Child Health at City St George’s, University of London, emphasised the breadth of harm that PTSD symptoms impose on families in the postpartum period, whether the trauma originates in a difficult birth or in other adverse experiences. She noted that many of these outcomes carry direct cost implications for the public purse, and that the research, which focused specifically on healthcare service use, found that health service costs alone for women with PTSD and their babies are over double those of women without PTSD within the first two years after birth, and possibly beyond. Ayers warned that unless action is taken to address birth trauma and PTSD, the annual cost of health service use by women and their babies will remain high, and argued that preventing traumatic births alongside implementing routine screening and treatment for PTSD would both benefit women and families and begin to bring these costs down.

The report’s publication was greeted with strong language from patient advocates. Dr Kim Thomas, Chief Executive of the Birth Trauma Association, said the study shows for the first time the scale of the financial cost of birth trauma to the NHS. She explained that the charity has long been aware that women affected by traumatic birth need far more care in the months and sometimes years following birth, whether in the form of counselling, physiotherapy or surgery. Describing the finding that traumatised women represent a cost to the NHS two-and-a-half times greater than other women in the postnatal period as a wake-up call to policymakers, Thomas urged the government to commission research into the wider costs to the economy when women are lost to the job market or their families break up as a consequence of birth trauma.

In Parliament, the report’s launch was framed as the culmination of years of campaigning. Rt Hon Rosie Duffield MP, Chair of the APPG on Birth Trauma, described it as a landmark report believed to be the first UK research into the economic cost of birth trauma and postpartum PTSD, building directly on the APPG’s 2024 Birth Trauma Inquiry, which she co-chaired and which highlighted the urgent need for research into the wider economic impact of birth trauma. She noted that the APPG has heard compelling evidence of the significant costs involved, from direct pressures on the NHS to lasting financial consequences for families, and welcomed the fact that Professor Ayers secured funding to undertake the work.

Turning evidence into policy, the researchers set out a clear set of recommendations. They call for routine screening and interventions for PTSD during pregnancy and after childbirth, alongside increased access to specialist perinatal mental health support for women experiencing symptoms. They emphasise that preventing traumatic births in the first place has the potential to save the NHS a substantial amount of money while improving the wellbeing of women and families. Workforce training is also highlighted as essential, to raise awareness of perinatal trauma and PTSD, embed trauma-informed principles of care, and help clinicians identify and support women at risk. Finally, the authors stress that further research is needed to ensure screening tools, treatments and trauma-informed care pathways are effective and evidence based, so that a problem long invisible in economic terms can finally be met with services equal to its scale.

Subject of Research: The economic impact of childbirth-related post-traumatic stress disorder on NHS healthcare use in the UK.

Article Title: New report first to outline economic impact of childbirth-related PTSD in the UK

Article References: New report first to outline economic impact of childbirth-related PTSD in the UK. (n.d.). Original publication

Image Credits: AI Generated

DOI: Not provided

Keywords: birth trauma, postnatal PTSD, childbirth-related PTSD, NHS costs, perinatal mental health, maternity care, economic impact, postpartum health, screening, trauma-informed care, women's health, health economics