The purpose of this study was to investigate whether patient age of 16 years and under is a valid “red flag” for back pain, by determining how often magnetic resonance imaging (MRI) investigations in these patients demonstrated significant pathology. This was a retrospective review of cases over a five-year period (2008–12). The radiology database was interrogated to identify all patients aged 16 and under who had undergone an MRI scan of their lumbar spine for a primary complaint of low back pain. All emergency and inpatient admissions were excluded from the study. Casenotes of each of these patients were analysed for demographics, clinical features, diagnosis and outcome. After exclusions, 98 eligible cases were identified. The age range of these patients was 2–16 years (mean age 12.63 years). The MRI scan found no abnormalities in 71.4% of cases. In the scans with positive findings, there were 8 cases of spondylolysis, 3 spondylolistheses, 9 cases of disc degeneration and 5 cases of Scheuermann's. Tumour or infection were found in only 3% of cases, (2 cases sacroilitis, 1 sacral chondroblastoma); there had been sacral or sacroiliac tenderness in each of these cases. In keeping with other recent studies, this study shows that the diagnostic yield of MRI in patients under the age of 16 with low back pain is relatively high (28.6%). However, scan findings did not significantly alter management in the vast majority of cases (97%). Serious pathology (infection or tumour) was found in only 3% of cases. We therefore suggest that an age of 16 years or less, in isolation, should not be a “red flag” indicator for low back pain. We do however advise a lower threshold for imaging in patients presenting with sacral region pain and tenderness

A delay in the diagnosis of paediatric acute and subacute haematogenous osteomyelitis can lead to potentially devastating morbidity. There are no definitive guidelines for diagnosis, and recommendations in the literature are generally based on expert opinions, case series and cohort studies.

All articles in the English literature on paediatric osteomyelitis were searched using MEDLINE, CINAHL, EMBASE, Google Scholar, the Cochrane Library and reference lists. A total of 1854 papers were identified, 132 of which were examined in detail. All aspects of osteomyelitis were investigated in order to formulate recommendations.

On admission 40% of children are afebrile. The tibia and femur are the most commonly affected long bones. Clinical examination, blood and radiological tests are only reliable for diagnosis in combination. Staphylococcus aureus is the most common organism detected, but isolation of Kingella kingae is increasing. Antibiotic treatment is usually sufficient to eradicate the infection, with a short course intravenously and early conversion to oral treatment. Surgery is indicated only in specific situations.

Most studies were retrospective and there is a need for large, multicentre, randomised, controlled trials to define protocols for diagnosis and treatment. Meanwhile, evidence-based algorithms are suggested for accurate and early diagnosis and effective treatment.