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KMID : 0359619950070010021
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Journal of Korean Knee Society
1995 Volume.7 No. 1 p.21 ~ p.25
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The Calculation of the Tibial Tunnel Depth in the Endoscopic ACL Reconstruction
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Abstract
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When performing an anterior cruciate ligament(ACL) reconstruction using a two-incision technique, graft length from the alteral femoral cortex to the anterior tibial cortex is usually of no concern, and bitunnel interference screw fixation can be achieved. But in the endoscopic one-incision technique, placing the gtraft´s tendon-bone interface flush with the intraarticular femoral tunnel results in distal graft protrusion. Mismatch can be avoided if sum of the tibial tunnel length plus the intraarticular distance of ACL is equal to or greater than the graft tendon length plus 20 mm (tehe minimum interference fixation possible when using the smallest available 20 mm long interference screw). The purpose of this study is to determine the relationship between the length of patellar tendon and that of anterior cruciate ligament, to calculate the tibial tunnel depth with thi9s for the elimination of graft-tunnel mismatch through the dissection of 19 cadaveric knees.
@ES The results were as follows:
@EN 1. The average patellar tendon length was 36.2±4.7mm (range 24.7-45.0).
2. The average ACL length was 23.7±3.9mm (range 16.5-30.3).
3. ACL length(mm) =0.73×Patellar tendon length-2.69 (p<0.001).
4. Tibial tunnel depth(mm)=0.27×patellar tendon length+27.69.
Although it shoud be verified with the clinical results, it can be concluded that the graft-tunnel mismatch can be diminished if the tibial tunnel depth s calculated before inserting a guide wire for tibial tunnel with this formula in the
endoscopic one-incision ACL reconstruction.
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