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News

New study to test the strength of anterior cruciate ligaments after knee surgery

Lloyd Instruments : 06 August, 2006  (New Product)
Scientists in Germany have been using the latest materials testing equipment from Lloyd Instruments to study the strength of anterior cruciate ligaments after knee surgery.
Scientists in Germany have been using the latest materials testing equipment from Lloyd Instruments to study the strength of anterior cruciate ligaments after knee surgery.

ACLs undergo a great deal of strain during routine exercise, and are often damaged during high profile sports such as football. The patellar tendon is the most commonly used graft in ACL reconstruction. One concern affecting rehabilitation time is the degree of hamstring graft fixation to the bone. The most recent stabilising techniques include attaching special bioabsorbable screws or inserting biodegradable pins into the graft to provide extra support. In either case, it is vital to know that the implant will be flexible and stable enough to withstand the typical stresses during everyday movement.

Researchers at Kiel University and Westfalian Wilhelms University Münster have been using a 5kN twin column LR5KPlus testing machine from Lloyd Instruments to compare hamstring graft fixation techniques. Single and cyclic tensile loads were applied to samples, held in custom made grips, in a parallel orientation to simulate a worse case scenario. After careful analysis of the maximum load results and stiffness data, the team concluded that bioabsorbable pins and bioabsorbable screw fixation provide similar benefits, and either one is justified as a recommended surgical technique.

The LR5KPlus used in the study is a powerful twin column universal testing machine, ideal for testing a variety of materials under different environmental conditions. A quick changeover of sample grip alters functionality completely, which makes testing a viable and cost-effective option in any research or manufacturing setting. It features a 5kN force capacity, and a 'Plug-and-Play' facility for easy setup. There are ten user defined setups, storage for up to 600 results, a powerful 8kHz data sampling rate, support for the company's NEXYGEN MT control software, and a flash upgradeable processor for rapid instrument upgrading.
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