Use of cast index and three-point index in paediatric both bone forearm fractures: a prospective study

Introduction The majority of paediatric both bone forearm fractures are treated with manipulative reductions and casting; loss of reduction is one of the most commonly reported complications. We aimed to assess the role of cast index and 3-point index as predictor of outcome of a successful closed reduction in distal both bones forearm fractures.

Materials and methods This prospective observational study was conducted at the Department of  Orthopedics, Kalpana Chawala Government Medical College in Karnal to assess the role of cast index and  3-point index as predictor of outcome of a successful closed reduction in distal both bones forearm fractures. In the present study, 55 patients 16 years old were included irrespective of sex with distal both bones forearm fractures, managed by closed reduction and casting were included.

Results Fracture reduction failure was observed in 32.7 % of the patients. Both three-point index and cast index were found to be significantly higher in patients with reduction failure. It was observed that at 2 weeks Area under curve (ROC Curve) for Cast index and Three point index was 0.72 and 0.85 respectively. At 4 weeks, Area under curve for Cast index and Three point index was 0.77 and 0.84 respectively and at 6 weeks 0.74 and 0.86 respectively. Thus, in the present study, CI and 3PI had similar predictability for fracture reduction failure.

Discussion There are a few limitations of our study: We could not observe the patients for a longer period of time to know re-modelling in the long term. We did not take in to consideration the severity of fracture, type of anesthesia used (conscious sedation versus General Anesthesia) and the fracture configuration while assessing the outcomes. We also did not collect information about anthropometric parameters like child weight and diameter of the forearm.

Conclusion The three-point index and cast index are clinically useful tools to assess the quality of cast molding following closed reduction of pediatric forearm fractures and to predict re-displacement in distal forearm fractures.

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