I fractured my 5th metacarpal. how long will i need a cast? does it depend on how bad the fracture is?

4 weeks: Most metacarpal fractures, if well aligned, require 4 weeks of full time splinting or casting. After this 4 week period, most patients can begin mobilization exercises but will require use of a removable splint for an additional 2-4 weeks. The duration of casting or splinting will depend on the severity of the fracture pattern.

Fracture Stability: A cast will likely be applied for a minimum of 3 weeks followed by transition to a splint. However, a variety of options are available and will depend on the stability of the fracture.