Indications/Contraindications
General:
Upper Extremity Terminal Devices-End Effectors:
Prosthetic devices are tools designed to provide or replicate certain aspects and
functions of the human hand including anatomical realism. All these devices have
benefits, limitations, ranges of function and liabilities that need to be understood by
the user-consumer.
The basis for any reliable functional outcome in using these devices is premised
upon having a well-designed, reliably suspended, comfortable, functional prosthetic
limb, which optimizes the user's remaining physical capabilities, including range of
limb motion and strength. The remaining limb itself, is a very basic limiter of function
and performance. Typically, the longer the limb the more functional capacity over a
prosthesis will be achieved, assuming the limb's muscular and skeletal framework are
not compromised beyond simply hand absence. Loss of muscle tissue, permanent
nerve damage and phantom limb sensations-pain can all impact the user's ability to
perform with a prosthesis. In general, a user with a limb absence where less than
25% of the humerus remains, will not be a good candidate for using upper extremity
prosthetic technology successfully. Additionally, the user's cognitive acuity and
capability are important in understanding the ranges of function and the specific limits
of function, while controlling such prosthetic tools, to optimize their performance and
avoid injury.
Finally, all prosthetic terminal devices, have inherent dangers of entanglement or
engagement where release can be compromised because of their physical exterior
design, unique unforgiving materials, and inanimate lack of "feel". Wearing an upper
extremity prosthesis does involve risk! Training and therapy are always recommended
when using a prosthesis, especially when using new or unique technology or changing
prosthetic system operative controls.
Specific:
Body Powered Devices: Prehensor TDs.
Body powered prosthetic devices using a shoulder harness and cable for operation
require a certain level of physical coordination and strength. Additionally, use of such
devices requires a sound cognitive basis that provides the user with the understanding
of the values of the technology, how it operates and its limitations and the potential for
both performance and self-injury. Body powered prosthetic devices require practice.
More practice will provide better functional outcomes in performance. Certain devices
have capabilities beyond that of the human hand regarding their ability to withstand
impact, withstand load and resist environmental elements such as severe heat, fire,
freezing cold temperatures and caustic chemicals. Other devices are inferior to the
human hand regarding such exposures. The user must understand and take advantage
of the aspects of each type of technology they choose to use .
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