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Evaluation and Comparison of Femoral Tunnel Placement During Anterior Cruciate Ligament Reconstruction Using 3-Dimensional Computed Tomography: Effect of Notchplasty on Transtibial and Medial Portal Drilling.

Dugas JR, Pace JL, Bolt B, Wear SA, Beason DP, Cain EL - Orthop J Sports Med (2014)

Bottom Line: Advocates of medial portal drilling claim that the transtibial technique results in a more vertical positioning of the graft, which could lead to subsequent failure and/or a residual pivot shift on postoperative examination.However, advocates of transtibial drilling state that with appropriate placement and adequate notchplasty, their technique places the graft in a more anatomically correct position on the wall, negating the resultant potential for pivot shift and early postoperative failure.Both drilling techniques place the graft in an anatomically correct position.

View Article: PubMed Central - PubMed

Affiliation: American Sports Medicine Institute, Birmingham, Alabama, USA.

ABSTRACT

Background: Advocates of medial portal drilling claim that the transtibial technique results in a more vertical positioning of the graft, which could lead to subsequent failure and/or a residual pivot shift on postoperative examination. However, advocates of transtibial drilling state that with appropriate placement and adequate notchplasty, their technique places the graft in a more anatomically correct position on the wall, negating the resultant potential for pivot shift and early postoperative failure.

Hypothesis: Transtibial femoral drilling can adequately reproduce the femoral origin of the anterior cruciate ligament (ACL) and place the graft in an anatomical position equivalent to medial portal drilling.

Study design: Controlled laboratory study.

Methods: Ten matched-pair cadaveric knees (N = 20) were scanned using computed tomography (CT), and 3-dimensional images of the native ACL origin were reconstructed. The matched pairs were then randomized into transtibial and medial portal groups. The femoral tunnel was drilled in each knee according to group. A bamboo skewer was placed in the femoral tunnel, and the knees underwent a second CT scan. Arthroscopic notchplasty was performed, and the femoral tunnels were redrilled. Radiographs confirmed placement, and the post-notchplasty tunnel was reamed with a 4-mm reamer. The knees underwent a third CT scan. CT scans compared femoral tunnel placement with the native ACL footprint before and after notchplasty.

Results: The post-notchplasty transtibial group revealed an average of 68.3% coverage of the native ACL femoral origin. The medial portal group revealed an average of 60.8% coverage, with 1 instance of perforation of the posterior cortex. There were no instances of perforation in the transtibial group.

Conclusion: Both drilling techniques place the graft in an anatomically correct position.

Clinical relevance: Transtibial drilling of the femur can adequately place the entry tunnel at the origin of the ACL's native footprint.

No MeSH data available.


Related in: MedlinePlus

Arthroscopy of the intercondylar notch of a right knee both (A) before and (B) after notchplasty.
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fig2-2325967114525572: Arthroscopy of the intercondylar notch of a right knee both (A) before and (B) after notchplasty.

Mentions: Following CT scanning, the bamboo skewer was removed, and a notchplasty was performed with an arthroscopic shaver and burr through the medial portal to remove “Resident’s Ridge” (Figure 2), changing the configuration of the posterior notch to resemble a smooth, inverted “U” rather than an A-notch, which allows one to visualize the back wall and properly position the over-the-top guide. An arthroscopic shaver was used to “score” the bone at the starting point via the medial portal. A size 7-mm Acufex over-the- top guide was again placed through the tibial tunnel, and the 3/32-mm guide wire was again drilled into the femur through the guide. A second AP and lateral radiograph were performed after notchplasty to confirm correct positioning. A cannulated 4-mm reamer was placed over the guide wire and advanced to a depth of 30 mm. The guide wire was removed and replaced by a 3.5-mm bamboo skewer. The knee was repotted, and a third CT scan was performed.


Evaluation and Comparison of Femoral Tunnel Placement During Anterior Cruciate Ligament Reconstruction Using 3-Dimensional Computed Tomography: Effect of Notchplasty on Transtibial and Medial Portal Drilling.

Dugas JR, Pace JL, Bolt B, Wear SA, Beason DP, Cain EL - Orthop J Sports Med (2014)

Arthroscopy of the intercondylar notch of a right knee both (A) before and (B) after notchplasty.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License 1 - License 2 - License 3
Show All Figures
getmorefigures.php?uid=PMC4555567&req=5

fig2-2325967114525572: Arthroscopy of the intercondylar notch of a right knee both (A) before and (B) after notchplasty.
Mentions: Following CT scanning, the bamboo skewer was removed, and a notchplasty was performed with an arthroscopic shaver and burr through the medial portal to remove “Resident’s Ridge” (Figure 2), changing the configuration of the posterior notch to resemble a smooth, inverted “U” rather than an A-notch, which allows one to visualize the back wall and properly position the over-the-top guide. An arthroscopic shaver was used to “score” the bone at the starting point via the medial portal. A size 7-mm Acufex over-the- top guide was again placed through the tibial tunnel, and the 3/32-mm guide wire was again drilled into the femur through the guide. A second AP and lateral radiograph were performed after notchplasty to confirm correct positioning. A cannulated 4-mm reamer was placed over the guide wire and advanced to a depth of 30 mm. The guide wire was removed and replaced by a 3.5-mm bamboo skewer. The knee was repotted, and a third CT scan was performed.

Bottom Line: Advocates of medial portal drilling claim that the transtibial technique results in a more vertical positioning of the graft, which could lead to subsequent failure and/or a residual pivot shift on postoperative examination.However, advocates of transtibial drilling state that with appropriate placement and adequate notchplasty, their technique places the graft in a more anatomically correct position on the wall, negating the resultant potential for pivot shift and early postoperative failure.Both drilling techniques place the graft in an anatomically correct position.

View Article: PubMed Central - PubMed

Affiliation: American Sports Medicine Institute, Birmingham, Alabama, USA.

ABSTRACT

Background: Advocates of medial portal drilling claim that the transtibial technique results in a more vertical positioning of the graft, which could lead to subsequent failure and/or a residual pivot shift on postoperative examination. However, advocates of transtibial drilling state that with appropriate placement and adequate notchplasty, their technique places the graft in a more anatomically correct position on the wall, negating the resultant potential for pivot shift and early postoperative failure.

Hypothesis: Transtibial femoral drilling can adequately reproduce the femoral origin of the anterior cruciate ligament (ACL) and place the graft in an anatomical position equivalent to medial portal drilling.

Study design: Controlled laboratory study.

Methods: Ten matched-pair cadaveric knees (N = 20) were scanned using computed tomography (CT), and 3-dimensional images of the native ACL origin were reconstructed. The matched pairs were then randomized into transtibial and medial portal groups. The femoral tunnel was drilled in each knee according to group. A bamboo skewer was placed in the femoral tunnel, and the knees underwent a second CT scan. Arthroscopic notchplasty was performed, and the femoral tunnels were redrilled. Radiographs confirmed placement, and the post-notchplasty tunnel was reamed with a 4-mm reamer. The knees underwent a third CT scan. CT scans compared femoral tunnel placement with the native ACL footprint before and after notchplasty.

Results: The post-notchplasty transtibial group revealed an average of 68.3% coverage of the native ACL femoral origin. The medial portal group revealed an average of 60.8% coverage, with 1 instance of perforation of the posterior cortex. There were no instances of perforation in the transtibial group.

Conclusion: Both drilling techniques place the graft in an anatomically correct position.

Clinical relevance: Transtibial drilling of the femur can adequately place the entry tunnel at the origin of the ACL's native footprint.

No MeSH data available.


Related in: MedlinePlus