Do you wear a knee brace for tendonitis?

Knee braces can help with patella tendonitis or Ilitibail Band syndrome (ITBS)

If its patella tendonitis you have (inflammation of the tendon just below the kneecap) then a single patella strap can work really well. It puts pressure through the tendon and supports the kneecap which reduces the forces and friction through the tendon.

If it's ITBS - irritation of the iliotibial band on the outer side of the knee, a double knee strap can work well as it puts pressure through the ITB, again reducing friction.

You may also find that doing strengthening and stretching exercises helps aswell