article · Radiology Case Reports
Evaluating patellofemoral symptoms in children requires an age-aware approach because knee joint morphology changes throughout growth, whereas standard magnetic resonance imaging thresholds are largely based on adult data. A case involving a nine-year-old girl presenting with anterior knee pain and gait disturbance, in the absence of trauma or prior dislocation, illustrates this diagnostic challenge. Imaging revealed a shallow trochlear groove measuring one millimetre and a widened sulcus angle of 164 degrees. Additional observations included Wiberg type II patellar morphology and an Insall-Salvati ratio of 1.3, which were treated as contributory rather than definitive diagnostic factors due to normal paediatric variability. Combining multiple concordant measurements enables clinicians to recognise structural predispositions prior to actual dislocation, enabling tailored, growth-respecting clinical management without misapplying adult benchmarks to skeletally immature patients.
Standard imaging criteria often misjudge paediatric conditions because adult benchmarks fail to reflect continuous skeletal development. Identifying joint abnormalities early allows clinicians to intervene before acute trauma, such as full patellar dislocation, takes place. This approach shows how cross-referencing multiple developmental measurements can guide safer, individualised care that preserves long-term joint function in growing children.
The abstract describes a clinical case report focused on diagnostic interpretation and does not indicate an application pathway.
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Patellofemoral symptoms in children require age-aware interpretation because trochlear and patellar morphology change during growth and several commonly used magnetic resonance imaging (MRI) thresholds were derived from adults. We report a 9-year-old girl with anterior knee pain and gait disturbance, without trauma or documented patellar dislocation. MRI showed a shallow trochlear groove (trochlear depth, 1 mm) and a widened sulcus angle (164°), together with Wiberg type II patellar morphology and an Insall-Salvati ratio of 1.3. The latter 2 findings were interpreted as contributory rather than independently diagnostic because of pediatric variability. The educational value of this case lies in integrating multiple concordant measurements, explicitly acknowledging age- and technique-related limitations, and avoiding uncritical transfer of adult cutoffs to a skeletally immature patient. MRI can identify a structural predisposition before a documented dislocation and support an individualized, growth-respecting management strategy.
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DOI: 10.1016/j.radcr.2026.07.129
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