Final answer:
The unsupported length between two points of fixation along an IM Nail is known as lo. It is important to consider the unsupported length for proper fixation and stability of the nail. Understanding this concept is crucial in the field of orthopedics.
Step-by-step explanation:
The unsupported length between two points of fixation along an IM Nail is known as lo. The unsupported length is the portion of the nail that experiences flexing or bending due to the shearing effect of the supported weight. It is important to consider the unsupported length when designing and using IM Nails to ensure proper fixation and stability.
For example, in Figure 5.19, the nail is shown flexing slightly (much larger than actual) due to the supported weight of the picture. The upward force of the wall on the nail illustrates equal and opposite forces across opposite cross sections of the nail. Understanding and considering the unsupported length is crucial in the field of orthopedics, where IM Nails are commonly used for fracture fixation and stabilization.