Intramuscular tendon length in agonist-antagonist myoneural interface components in transtibial amputation:...

Area of Science:

• Biomedical Engineering
• Anatomy
• Rehabilitation Science

Background:

• Muscle spindles and Golgi tendon organs are vital for muscle control and proprioception.
• The agonist-antagonist myoneural interface (AMI) shows promise for restoring proprioception and prosthetic control in amputees.
• Anatomical constraints in residual limbs present challenges for AMI construction.

Purpose of the Study:

• To analyze the intramuscular course of tendons in key lower leg muscles relevant to AMI.
• To investigate correlations between donor anthropometrics and muscle/tendon anatomy.
• To provide anatomical data for improving AMI techniques and prosthetic limb design.

Main Methods:

• Dissection of 25 lower legs from fresh-frozen human Caucasian donors.
• Analysis of gastrocnemius complex, tibialis posterior, tibialis anterior, and peroneus longus muscles.
• Detailed demographic, anthropometric, and imaging measurements, followed by statistical analysis.

Main Results:

• Tendons extended over 75% of the distal muscle belly in all examined muscles.
• Peroneus longus and medial gastrocnemius muscle belly length correlated positively with donor height and weight.
• No significant correlation was found between tendon-to-muscle belly length ratio and donor height or weight.

Conclusions:

• The agonist-antagonist myoneural interface (AMI) can improve proprioceptive feedback for transtibial amputees.
• Donor gender did not influence muscle characteristics, but height and weight did.
• Findings offer crucial anatomical insights for advancing AMI and prosthetic design.