Mechanical properties of suture materials in vitro and after in vivo implantation in horses.

This research work tested and compared the tensile strength of four different types of sutures; braided polyester, polyglycolic acid, monofilament nylon, and polydioxanone, both in laboratory conditions and after being implanted in horses over various periods.

Overview of the Study

• The researchers carried out a comprehensive study on four types of suture materials, namely braided polyester, polyglycolic acid, monofilament nylon, and polydioxanone. These sutures were tested for their tensile strengths in a laboratory setting and then implanted in horses to examine their in vivo performance.

Methodology

• A tensile testing method was utilized where reproducible loops of the suture materials were created.
• The sutures were then subjected to an in vitro testing phase where their strength, energy absorption and percentage elongation up to the point of breakage were determined.
• Post the in vitro examination, the sutures were subcutaneously implanted into horses for durations of 7, 14, and 28 days for additional testing.

Findings

• The study revealed that braided polyester suture showed the highest maximum breaking strength and energy absorption over a span of 28 days.
• Polydioxanone sutures demonstrated superior mechanical performance over the same time period compared to polyglycolic acid sutures.
• By the 28th day, none of the measured parameters could be observed in the polyglycolic acid sutures. Thus, indicating these sutures may have undergone complete degradation or absorption within this period.
• Monofilament nylon sutures were found to have the lowest breaking strength amongst the three other materials tested on the 28th day.

Conclusion

• The results of the study indicate the superiority of braided polyester sutures and polydioxanone sutures over polyglycolic acid and monofilament nylon when analyzed for breaking strength and energy absorption over a 28-day period.
• This research could prove beneficial for medical practitioners in selecting appropriate suture material for surgical procedures, particularly those requiring a longer healing period.