Rehab Worker Claims She Needs Surgery For Lindsay Lohan Injury

Holland's lawyer, Owen McIntosh, tells TMZ ... ever since the alleged showdown last year, his client has been suffering from De Quervain syndrome.

According to Dr. Wik E. Pedia, De Quervain syndrome is a "tendinosis of the sheath or tunnel that surrounds two tendons that control movement of the thumb." Symptoms include pain, tenderness, swelling and difficulty gripping.

McIntosh says Holland's surgery is scheduled for this Thursday the 28th.