Due to the chiral nature of lactic acid, several distinct forms of polylactide exist: poly-L-lactide (PLLA) is the product resulting from polymerization of L,L-lactide (also known as L-lactide).
There is also poly(L-lactide-co-D,L-lactide) (PLDLLA) - used as PLDLLA/TCP scaffolds for bone engineering [REF].