CoLS Classic Knee Ligament Repair System

Main principles of the CoLS system:

Graft:
– only one tendon harvested
– short closed loop configuration (4 tendon strands, ST4)
– pre-tensioned
– introduced arthroscopically into knee (all inside)
– press fit in the bone sockets
– 360-degree bone contact 

Bone tunnels:
– independent tunnel positioning using outside-in targeting method
– small diameter (4.5 mm)
– manual retrograde reaming of bone sockets for the graft
– sockets match size of each end of the graft

Fixation:
– suspension of ligament loop using anchoring tape
– CoLS fixation screws placed in the tape using outside-in method

The CoLS system is mainly indicated for:
– partial or complete ACL tears in adults
– PCL tears

The CoLS instrumentation consists of:
– a work table used to prepare and pretension the graft (0–300 N)
– a universal aiming device used for outside-in placement of guide wires in the tibia and femur for ACL and PCL reconstruction
– a set of winged drills used for retroreaming of the bone sockets (7 to 11 mm)

The CoLS system consists of:
– a CoLS screw (ø10 mm, length 20 or 25 mm) made of titanium or PEEK.

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2. Lopes, R., et al., Does retrograde tibial tunnel drilling decrease subchondral bone lesions during ACL reconstruction? A prospective trial comparing retrograde to antegrade technique. The Knee, 2016. 23(1): p. 111-115.
3. Marchand, J.B., et al., Do graft diameter or patient age influence the results of ACL reconstruction? Knee Surg Sports Traumatol Arthrosc, 2015.
4. Lefevre, N., et al., Postoperative discomfort after outpatient anterior crucial ligament reconstruction: A prospective comparative study. Orthop Traumatol Surg Res, 2015.
5. Cassard, X., et al., Anterior cruciate ligament reconstruction in children with a quadrupled semitendinosus graft: preliminary results with minimum 2 years of follow-up. J Pediatr Orthop, 2014. 34(1): p. 70-7.
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7. Colin, F., et al., Aseptic arthritis after ACL reconstruction by Tape Locking Screw (TLS(R)): report of two cases. Orthop Traumatol Surg Res, 2012. 98(3): p. 363-5.
8. Cassard, X., et al., Comments on: « aseptic arthritis after ACL reconstruction by Tape Locking Screw (TLS): report of two cases » by F. Colin, F. Lintz, K. Bargoin, C. Guillard, G. Venet, A. Tesson, F. Gouin published in Orthop Traumatol Surg Res 2012;98(3):363-5. Orthop Traumatol Surg Res, 2012. 98(7): p. 854; author reply 855.
9. Collette, M. and X. Cassard, The Tape Locking Screw technique (TLS): A new ACL reconstruction method using a short hamstring graft. Orthop Traumatol Surg Res, 2011. 97(5): p. 555-9.