Young Cheol Yoon MD, Abstract Co-Author: Nothing to Disclose

Soo Jeong Yoon MD, Presenter: Nothing to Disclose

Bone tunnel enlargement after anterior cruciate ligament (ACL) reconstruction represents a well-established phenomenon. Clinically, bone tunnel enlargement in the revision ACL reconstruction represents a great challenge to surgeons, may require staged reconstruction and additional operative procedures. To our knowledge, clinical significance of bone tunnel enlargement is not well established and does not known how affect clinical outcome. This study aimed to evaluate correlations between diameter of bone tunnel using computed tomography (CT) with respect to functional and clinical scores.

Forty-seven patient (41 males and 6 females, mean age of 34 years old) who underwent ACL reconstruction with double bundle technique using auto-hamstring graft and had immediate postoperative (range: 1-4 days, mean of 2.5 days) and follow-up CT scans (range: 297-644 days, mean of 410.4 days) entered this study. Diameter of each tunnel (two femoral and two tibial) of both immediate postoperative (D1) and follow-up CT (D2) scans were independently measured by two MSK fellowship trained radiologists. They obtained diameters of each tunnel at 5 levels (proximal end, midportion, distal end, one-quarter and three-quarter portion) from longitudinal plane of each tunnel using double oblique multiplanar reconstruction, and a mean value among five diameters of each tunnel was regarded as diameter of it. Evaluation of graft stability and clinical performance was performed with functional (KT-2000) and clinical scores (IKDC objective, Lysholm). Correlation analysis was performed between D2 and functional and clinical scores, and D2/D1 and functional and clinical scores.

Correlation analysis showed no significant relationship between D2 and functional and clinical scores nor D2/D1and functional and clinical scores (P>0.05). There were no significant effect of age, gender and side (P>0.05). Interobserver variability for measurements shows moderate to excellent (0.4133 to 0.9716). Intraobserver variability measurements show excellent ranging between 0.9911 and 0.8891.

Bone tunnel enlargement after anterior cruciate ligament (ACL) reconstruction by double bundle technique using auto-hamstring graft may not be correlated with graft stability or clinical outcome.

Enlargement of bone tunnel after ACL reconstruction may not need to be emphasized.

Yoon, Y, Yoon, S, Diameters of Femoral and Tibial Tunnels on CT after ACL Reconstruction with Double Bundle Technique Using Auto-hamstring Graft: Correlation with Functional and Clinical Scores.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14004340.html