Thumb Spica Splinting - StatPearls - NCBI Bookshelf - What is a thumb spica cast
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A long-arm thumb spica cast is applied with the elbow in 90 to degrees of flexion to prevent premature removal (see Fig. from Procedure 93). The arm. These images are a random sampling from a Bing search on the term "Thumb Spica Cast." Click on the image (or right click) to open the source.