A MCL injury is a sprain of the MCL, which is the primary restraint to valgus stress on the knee
Initially, a patient with a MCL injury
is treated with ice, elevation; analgesics, a hinged knee
brace, and protected weight-bearing as tolerated.
The patient should be referred to physical therapy. Intra-articular injection of corticosteroids, and hyaluronic acid, may have a small effect on knee pain.
I think Synvisc treatments are fine.