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PLLA/PMMA blends, which are of interest as in-vivo biomaterials due to their biocompatibility and differential resorbability, were studied with respect to selected mechanical properties. These blends are immiscible and the mechanical properties of the intermediate compositions, particularly the co-continuous compositions near the phase inversion point, are critical to biomedical engineering design. Overall, results show that the mechanical properties of these compositions are quite good, as measured by a variety of methods. Tensile modulus increased 22 % and fracture strength 15%. Flexural modulus was 7-8 % above the proportional value. Dynamic measurements at the glass transition revealed enhanced modulus (storage) around the phase inversion where the modulus was increased>70%. Unusual glass transition data were measured by DMA that seem to indicate an unexpected drop in PMMA glass transition as small to moderate amounts of PLLA are added, supporting other corroborating DSC studies. Preliminary nanoindentation measurements show that blends in this system have higher storage modulus and higher loss modulus than neat PMMA. Overall, this system possesses well bonded interfaces, capable of excellent load transfer, and some degree of polymer molecular orientation that enables synergistic Young’s modulus values in co-continuous blends