Low-temperature thermoplastic splinting material

A therapist warms the sheet in controlled water, moulds it around the relevant finger, hand, wrist or forearm, and lets it cool into shape. The finished splint can limit a painful movement, protect healing tissue or support a joint while allowing other movement. It is different from a rigid cast because it may be removable and adjustable. The design depends on the condition, swelling, skin sensitivity and the movement that needs protection; examples include carpal tunnel syndrome, trigger finger and De Quervain's tenosynovitis.

Wear the splint for the schedule given by your clinician and keep fasteners secure without making them tight. Check the skin after removing it, keep the material clean and dry as instructed, and never heat or reshape it at home unless you have been shown how. Gentle movement of uncovered joints can reduce stiffness when permitted. A review may be needed if swelling changes the fit or the splint rubs, cracks or no longer supports the intended movement.

Remove the splint and seek prompt advice for increasing numbness, tingling, unusual colour, cold fingers, severe pressure or rapidly worsening pain. Contact the treating team for blisters, persistent rubbing, skin breakdown or a fit that prevents the movement you were told to keep. After an injury, urgent assessment may be needed if the finger or wrist looks deformed or cannot move.

Ask what the splint is protecting, when it should be worn, which exercises are allowed and how it should be cleaned. Ask how it compares with a standard splint or fracture casting for your diagnosis.