Which statement about prosthetic selection is true?

Which statement about prosthetic selection is true?

• A. Residual limb length is irrelevant
• B. Shorter residual limbs may limit both the type of prosthesis and socket fit
• C. Length does not affect control
• D. Longer residual limbs always have worse control

Answer: (B)

The main idea is that residual limb length directly influences what prosthetics can be used and how well they fit. Shorter residual limbs provide less surface area for the socket to grip and seal, and they offer fewer muscles or control sites for operating the device. That combination makes it harder to achieve a stable, comfortable socket and can limit the types of prostheses that are feasible, because many designs rely on adequate limb length for suspension, alignment, and control signals. In practical terms, a very short limb may necessitate alternative suspension methods, special socket designs, or even different device options that can accommodate limited shape and muscle availability. If the limb is longer, there are more opportunities for a secure socket and more muscle sites to drive control, which generally expands the range of usable prostheses. However, longer limbs still require appropriate fit and control considerations, so length isn’t the sole determinant of success. This is why the statement about shortening affecting both prosthesis type and socket fit is the best answer.

The main idea is that residual limb length directly influences what prosthetics can be used and how well they fit. Shorter residual limbs provide less surface area for the socket to grip and seal, and they offer fewer muscles or control sites for operating the device. That combination makes it harder to achieve a stable, comfortable socket and can limit the types of prostheses that are feasible, because many designs rely on adequate limb length for suspension, alignment, and control signals. In practical terms, a very short limb may necessitate alternative suspension methods, special socket designs, or even different device options that can accommodate limited shape and muscle availability.

If the limb is longer, there are more opportunities for a secure socket and more muscle sites to drive control, which generally expands the range of usable prostheses. However, longer limbs still require appropriate fit and control considerations, so length isn’t the sole determinant of success.

This is why the statement about shortening affecting both prosthesis type and socket fit is the best answer.