Hand components are the parts of upper limb prostheses that provide function in daily life, and they can be used together with electronic control in myoelectric hand systems. The choice of the hand and wrist section varies according to the amputation level, the structure of the residual limb and the person's needs in daily activities. The suitable component is determined and fitted in line with the specialist physician's prescription and medical report.
Types of hand components
Hand sections with different operating principles can be used in upper limb prostheses:
- Passive (aesthetic) hands: Used for appearance and balance; they do not provide active movement.
- Mechanical (body-powered) hands: They can be opened and closed by means of a cable through shoulder and trunk movements.
- Myoelectric hands: They operate electronically using electrical signals taken from the muscle.
Multi-articulating and myoelectric hands
Multi-articulating hand systems can support different grip patterns by allowing the fingers to move individually; the details of these designs are covered under types and features of bionic hand prostheses. In this way, everyday movements such as holding, gripping and orienting objects may become easier.
In myoelectric hands, surface electrodes detect the signals from muscle contraction and enable the hand to open and close. Movements such as wrist rotation can also be added with additional channels. The wrist section may have a design that can be positioned in different positions.
Assessing suitability
In higher-level limb loss, the hand component is planned together with other components such as prosthetic elbow joints. Which hand component is suitable is assessed according to factors such as residual limb length, the condition of the muscle signals, and carrying and gripping expectations. Component selection, measurement and the fitting process are planned after the assessment of the relevant specialist physician.
This content is for informational purposes; you should consult your physician for diagnosis and treatment.
