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New screw for retensioning or replacement of the anterior cruciate ligament

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Partner keyword: 
Medical Technology / Biomedical Engineering
Physiotherapy, Orthopaedic Technology
Surgical instrumentation and equipment
Surgical instrumentation and equipment


An orthopaedic surgeon from a Spanish medical institute has developed a system to retension or replace the anterior cruciate ligament in a knee injury by means of an innovative screw. The system avoids the need to extract any graft and therefore it is less aggressive for the patient. The institute would like to get in contact with orthopaedic clinics and manufacturers of medical devices to further develop the system through technical cooperation agreements.



One of the most common and disabling knee injuries, both in the workplace and in sports, is the anterior cruciate ligament injury. It has always been considered that the cruciate ligament does not have the ability to heal on its own, so for its repair it is replaced by a new one. This procedure is known as a ligamentoplasty. Ligamentoplasty is usually performed using a graft from the same injured knee of the patient, either the patellar tendon or the goose foot tendons. This procedure is not without risks and complications and, although it offers acceptable results, it entails the added injury from the graft extraction. On the other hand, it has been observed over years of surgical practice that the ligament is capable of healing, but it almost always does so to surrounding structures such as the posterior cruciate ligament or it remains retracted without healing.
For this reason, a Spanish medical institute has devised a system to retension the injured ligament so that it is not necessary to extract any graft (thus avoiding the added injury of said surgical act) and achieving an anatomical repair of it. It would be a less aggressive technique for the patient and less morbidity. It would be done through a tunnel made in the femur and fixed to it with a double screw designed in the institute.
The main characteristics of the fixation screw concept to be developed are:
- Internal canalization for the extraction of the ligament fixation threads.
- Upper tabs for grip with a “mandrel” type system for insertion.
- Upper opening in its head for the insertion of a dam plug for the threads.
- Extra staple-type fixing arms (at this point both the staple approach and the simple approach, without staple, have been developed). Once the ligament has been sewn, these threads are extracted using a needle, which serves as a guide for the screw and causes these threads to pass through it.
These threads would then be caught by means of the dam plug. To facilitate the insertion of the screw, its guidance with the threads and its final “closure” by means of the dam cap, given the difficulties that this procedure entails on an operating table (poor visibility, different body conditions of the patient, etc.), the complementary development of a tool is proposed to facilitate the different fixation steps of the surgical technique in question.
The medical institute would like to reach technical cooperation agreements with orthopaedic clinics and/or manufacturers of surgical devices with the aim of further developing the system and test its application.

Advantages & innovations

Cooperation plus value: 
This double screw is useful for either retensioning or replacing the broken ACL (anterior cruciate ligament). Therefore, the orthopaedic surgeon can decide intraoperation one technique or the other. In case the surgeon decides to retension the ACL it is not necessary to get any graft from the knee of the patient so it is much less aggressive and the recovery of the patient is quicker.

Stage of development

Cooperation stage dev stage: 
Prototype available for demonstration

Partner sought

Cooperation area: 
The potential partners could be surgical instruments manufacturers and medical institutions working in orthopaedic surgery. The Spanish medical institute would like to reach technical cooperation agreements to further develop this technology.

Type and size

Cooperation task: 
SME 11-50,University,R&D Institution,SME <10,>500 MNE,251-500,SME 51-250,>500


New screw for knee surgery.