There is not normally a need to. What exactly makes you think you should need to do this - especially fo rone row?

Normally the space will be reused a new rows are added/deleted etc. Under rare situations such as a heap table and all new data being added then huge deletes of old data you can end up with a large number of empty pages. These will be used if new rows are added or you can create a clustered index on the table to restructure it.

Mike John