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General Orthopaedics

IS “SOFTCAST” (3M) STRONG ENOUGH FOR ACUTE POTENTIALLY UNSTABLE PAEDIATRIC FOREARM FRACTURES?

South West Orthopaedic Club (SWOC)



Abstract

Softcast is an attractive alternative to POP for unstable forearm fractures, providing a comfortable, water-resistant splint that can be removed without a plaster saw. Unreinforced Softcast has, however, only been recommended for buckle fractures. A laboratory study was undertaken to compare standardised POP, Softcast and reinforced Softcast splints at clinically relevant endpoints. The load at clinical failure of a 6-wrap Softcast forearm splint was 504N in bending, 202N in kinking, and 11Nm in torsion (equalling 30.4%, 26% and 42.2% of the equivalent values for a circumferential 4-wrap POP). Softcast was however stronger in all modes than a fibreglass-reinforced Softcast splint, such has been recommended for acute fractures. Furthermore, the load to failure in all modes exceeds that which can be exerted by body weight in many paediatric patients. Softcast demonstrated complete recovery of its original shape on unloading, and was 4% lighter than POP. A 6-wrap Softcast splint provides adequate mechanical stability and protection for paediatric patients up to 20kg, not engaged in high-risk activities. The primary risk is not of fracture angulation and loss of position, but temporary indentation of the splint, causing discomfort or pain. Considering its ease of removal, Softcast may be preferable for younger paediatric patients.