i have mcp joint mild effusion and dorsal plate...

Dear Customer
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Does mcp joint mild effusion and dorsal plate partial tear with extension of the fluid into the dorsal plate  needs cast ?
in those cases , usually doctor will need some medical examination first , then determine the best treatment pathway , which usually include a splinter , not cast 
What to do next ? 
1. follow doctor instructions
2. use prescirbed medication 
3. have plenty of rest 
4. if any newsymptoms appeared, reconsult your doctor soon 
Will the joint effusion go way ?
its expected to go away soon , its may need around 2 weeks or more to totally go away
When to expect to get full recovery in your medical condition ?
- its expected to get full recovery around 2-3 months 
Last advice :
- visit your doctor later and do the needed imaging test ( X-ray or MRI ) to make sure of your treatmenot pregression 
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Kind Regards