Intro:

For people with partial hand amputations, performing daily tasks like buttoning a shirt or typing on a keyboard can be extremely difficult. Traditional prosthetic hands often move as one unit, limiting dexterity and fine control.

A new study published in the Journal of Prosthetics and Orthotics evaluated how combining the Starfish procedure—a surgical technique that improves muscle signal detection—with a four-site myoelectric prosthesis can restore independent finger control and improve both hand function and user satisfaction.

Key Findings:

  • Improved function: Patients using the four-site myoelectric prosthesis showed an average 22-point improvement in hand function on the Southampton Hand Assessment Procedure (SHAP).
  • Better dexterity: The Clothespin Relocation Test showed faster completion times (up to 1.8 seconds quicker) after training with the new device.
  • Less effort required: The NASA Task Load Index showed a lower mental workload, suggesting easier and more intuitive control.
  • High satisfaction: All participants reported being “satisfied” or “very satisfied” with the device’s comfort, control, and app configuration.
  • Independent digit control: The prosthesis allowed users to move each finger separately—something traditional prostheses cannot do.

Why It Matters:

The Starfish procedure repositions certain hand muscles closer to the skin surface, improving how sensors detect electrical signals. When used with a four-site myoelectric prosthesis, this enhanced interface gives patients precise control of each prosthetic finger.

This technology allows users to perform detailed, two-handed tasks—like fastening buttons, typing, or handling tools—more efficiently and naturally. For clinicians, it demonstrates how combining surgical innovation with advanced prosthetic design can meaningfully improve upper-limb rehabilitation outcomes.

Conclusion:

Combining the Starfish procedure with a four-site myoelectric prosthesis provides measurable improvements in hand performance, control, and satisfaction. These results highlight the growing potential of individualized prosthetic technology to restore natural function and independence.

If you or your patient has a partial hand amputation, discuss myoelectric prosthesis options with your prosthetist to see if this advanced technology may help improve daily function.

Reference:

Serbin RP, Loeffler BJ, Frix JT, et al. Functional Outcomes and Patient Satisfaction With a Four-Site Myoelectric Prosthesis System Following the Starfish Procedure: A Case Series. Journal of Prosthetics and Orthotics. 2025; 37(4): 212–220.