The elbow joint is one of the basic components of arm prostheses used for amputations at the upper arm level (transhumeral) or higher, and it is an integral part of above-elbow arm prosthesis fittings. By imitating the bending (flexion) and straightening (extension) movements of the arm, it allows the hand to be brought into different positions in space. Fittings are planned in line with the specialist physician's assessment and prescription/medical report.
Types of elbow joints
Prosthetic elbow joints may have different operating principles depending on the user's needs and the amputation level:
- Mechanical (body-powered) joints: They can be locked and unlocked by means of cables connected to shoulder and trunk movements.
- Electronic (myoelectric) joints: They direct movement using electrical signals taken from the remaining muscle (electromyography); this principle is explained in more detail under myoelectric arm prostheses.
- Lockable joints: They are fixed at a certain angle to maintain the position of the arm during daily activities.
Operating principle
In electronic elbow joints, muscle signals are detected to determine the direction and speed of bending. In some systems, grip force and movement speed are continuously monitored and can be adjusted in proportion to the muscle signal. Correct functioning of the joint depends on proper measurement, custom adjustment and regular check-ups.
Appearance and care
Cosmetic covers fitted to the prosthetic arm can be prepared to match the skin color and texture. Silicone-based covers may make daily cleaning easier; surface dirt can usually be removed with soap and water. The lifespan of the cover varies depending on conditions of use and care.
This content is for informational purposes; you should consult your physician for diagnosis and treatment.
