A new device and method for controlling the load in rabbit medial collateral ligament reconstructions

Area of Science:

• Biomedical Engineering
• Orthopedic Surgery
• Biomaterials Science

Background:

• Assessing intra-operative graft tension is crucial for successful ligament reconstruction.
• Existing methods lack the sensitivity to accurately quantify graft tension.
• Understanding the impact of tension on healing ligament grafts requires precise measurement tools.

Purpose of the Study:

• To develop and validate a sensitive device for measuring prefixation tension in rabbit medial collateral ligament (MCL) grafts.
• To establish a reproducible method for creating varying graft tension levels (tight, anatomic, loose) in an animal model.
• To correlate intra-operative graft tension with immediate postoperative laxity measurements.

Main Methods:

• Development of a novel tensioning device utilizing strain gauges to measure prefixation loads.
• Application of the device to rabbit MCL grafts at three distinct tension levels.
• Immediate postoperative assessment of graft load-deformation behavior using an Instron materials testing machine.
• Quantification of ligament laxity through analysis of low-load behavior.

Main Results:

• The developed tensioning device accurately and reproducibly measured prefixation graft loads.
• Distinct graft tension levels (tight, anatomic, loose) were successfully created intra-operatively.
• A significant correlation was observed between intra-operative graft tension and immediate postoperative MCL laxity.
• A baseline of laxity values was established for future healing studies.

Conclusions:

• The novel tensioning device is effective for quantifying and controlling intra-operative graft tension in MCL reconstructions.
• This tool enables reproducible manipulation of graft tension, facilitating studies on ligament healing.
• The findings provide a foundation for investigating the biomechanical effects of graft tension on healing ligament grafts in an animal model.