Improved Achilles tendon healing by early mechanical loading in a rabbit model

Area of Science:

• Orthopedic research
• Biomedical engineering
• Regenerative medicine

Background:

• Tendon injuries require effective healing strategies.
• The tendon-bone interface is crucial for functional recovery after repair.
• Understanding the impact of mechanical loading on healing is vital.

Purpose of the Study:

• To evaluate the structural integrity and attachment strength of a healing tendon-bone interface.
• To determine the role of mechanical loading in promoting tendon healing.

Main Methods:

• Sixty rabbits underwent Achilles tendon detachment and repair.
• One group was immobilized post-surgery; the other received immediate loading.
• Histological and biomechanical assessments were performed at 4 weeks.

Main Results:

• The loading group exhibited significantly greater ultimate stress (4.598 N/mm²) compared to the control group (3.388 N/mm²).
• Histological analysis revealed a more organized tendon-to-bone interface with increased chondrocyte presence in the loading group.
• These findings were statistically significant (P < 0.05).

Conclusions:

• Mechanical loading positively influences the healing of the tendon-bone interface.
• Early postoperative loading enhances both the structural organization and attachment strength of repaired tendons.