If the named conservative therapy methods don't bring an sufficient success and the progression can't be stopped or exceeds a certain degree than it is time to think about a spine stifling operation. During the operation a pole which is fixed at the spine with some screws will be brought in your body. This very comlicate operation should only be made in hospitals which are specialised on it.
But an operation always should be the last and a good reflected step. One time operated the stiffness can't be removed. Furthermore everyone should know that indeed an operation promises a good chance to get a straighter spine but it doesn't promise a restless painfreedom or a life without following problems.