A transradial (below-elbow) amputee with strong residual wrist flexor and extensor muscles requires a prosthesis for fine hand function. Which type of terminal device is controlled by surface EMG signals from these residual muscles?

• A Body-powered hook with figure-of-eight harness
• B Passive cosmetic prosthesis
• C Myoelectrically controlled prosthetic hand ✓
• D Switch-controlled electric hand operated by chin buttons

Explanation

Myoelectric prostheses use electrodes over residual forearm muscles to detect EMG signals, amplify them, and drive the motorised hand or wrist. They suit transradial amputees with good muscle signal strength who need precision grip without a harness. Body-powered devices rely on shoulder and scapular motion through cables and a harness, which distinguishes them clearly from myoelectric control.

Reference: Orthotics and Prosthetics in Rehabilitation, Chui et al., 4th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.