In November of 2019 the Social Security Administration (SSA) published proposed Rule changes to the categories of disability reviews. Once a person is declared disabled and eligible for disability benefits, the SSA has a category they put you in to determine when your case will be reviewed in the future. The new category is called MIL or medical improvement likely.
This category would include impairments that the SSA believes typically do not result in permanent irreversible structural damage and will likely get better with treatment.
So, if you have a muscular skeletal impairment or a certain mental impairment, you can expect a two (2) year review of your condition by the SSA. It is very important for you to continue medical treatment after receiving a favorable decision from the SSA because your continuing medical treatment is exactly what will be used to determine if you continue to be eligible for benefits.