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Abstracts / Injury Extra 41 (2010) 131-166 155 fixing such condylar fractures is frequently akin to joining eggshells. However, our previous work has also shown that the clamping forces (in the case of the T2SCN), and the stiffness of the cancellous bone and cortical shell contribute to the different mechanisms of load transfer that can occur in these devices. This paper shows some recent work that examines variations in cortical shell thickness, cancellous bone modulus, and the compression force from condylar bolts. A significantly reduced cortical thickness is used while a range of cancellous bone moduli representing good quality bone and weak osteoporotic bone are examined.The model examines both strength and stiffness. In general the pre-compression from the condylar bolts (T2SCN) produces localised compressive stress in the region adjacent to the end washer, but can provide a stiffer construct for subsequent loading. However, this outcome is also dependent on the quality of the cancellous bone adjacent to the nail. With low modulus cancellous bone cortical engagement may restrict the friction developed between bone and nail.Under torsion, the nail constructs are always more effective than side plate constructs, and generally the locked nail provides good load-carrying capacity against torsion loads.