Traumatic acromioclavicular separation in the skeletally immature patient is frequently overdiagnosed and overtreated. Fifty-eight children, aged 5 to 16 years, who presented over a 15 year period with injuries to the distal clavicle, were reviewed retrospectively. The majority showed coracoclavicular widening radiographically, suggesting acromioclavicular separation. In 45 cases, a distal clavicular fracture was identified, while an acromioclavicular separation without fracture was initially diagnosed in 13. Long-term followups of these patients demonstrate excellent results with conservative management. "Pseudodislocation" involves a clavicular fracture of the lateral metaphysis or metaphyseal epiphyseal separation and not an acromioclavicular disruption. This pseudodislocation of the acromioclavicular joint in the skeletally immature patient must be differentiated from the adult counterpart to avoid unnecessary operative intervention.

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Our data suggest that heparinization induces platelet activation. We assume that a loss of larger and more activated platelets from the circulation contributes substantially to the platelet function defect of CPB.

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