The objective of the present study was to quantify the response of an isolated WorldSID rib subassembly to quasi-static and dynamic loading at angles up to 30 degrees from lateral. A test fixture was designed consisting of two flat plates mimicking the WorldSID spine plate and was instrumented with two uniaxial load cells to measure independent loads transmitted by either the inner rib band or the thorax or abdomen ribs. The fixture and WorldSID rib subassembly were loaded in either a quasi-static or dynamic impact at 3, 4, or 5 m/s and at angles 0, ± 15, ± 30 degrees with respect to lateral, rotated about the Z axis. Quasi-static stiffness of the rib did not vary substantially with respect to loading direction for the first 30 mm of stroke. Dynamic stiffness was influenced by loading rate and loading direction, with highest impactor force found for -30 degrees (posterior). Using IR-TRACC deflections, stiffest response was demonstrated at anterior and posterior oblique loading. Maximum impulse to the spine plate load cells was observed at 0 degrees and also resulted in maximum IR-TRACC deflection. Optimized loading to maximize spine impulse while minimizing deflection was dependent on the chosen deflection measurement method (IR- TRACC or external deflection). Future work may characterize response using alternative injury metric measurements.