All injuries result in scar tissue. Scar tissue results from a tear to a usually straight and effective muscle fibre. When the muscle tissue rebuilds itself it rebuilds in a mess of fibres. These fibres are strong but are not effective for movement and it then becomes more likely that the fibres around the injury site will become strained and more likely to become injured.
Sports massage will straighten out this mess of fibres allowing the fibres to rebuild in a straight line again.
The result of this is that you are back to normal functioning and it is less likely to have another tear.
All good then !!