How Important is the Tunnel Position in Outcomes Post-ACL Reconstruction: A 3D CT-Based Study

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Sports Medicine

Background:

• Anatomical drilling of femoral and tibial tunnels is crucial for successful anterior cruciate ligament (ACL) reconstruction.
• Evaluating tunnel placement accuracy and its impact on patient outcomes is essential.

Purpose of the Study:

• To compare two techniques for drilling femoral and tibial tunnels in single bundle ACL reconstruction.
• To assess patient-reported outcomes and knee stability based on tunnel placement using 3D CT scans.

Main Methods:

• Sixty patients undergoing single bundle ACL reconstruction were divided into two groups (Technique A and Technique B).
• Patient outcomes (Lysholm, IKDC, Tegner, hop test, Lachman test) were evaluated pre-operatively and after a minimum 27-month follow-up.
• 3D CT scans were used to classify femoral tunnel positions (well-placed, slightly misplaced, grossly misplaced) and tibial tunnel positions (optimal, suboptimal).

Main Results:

• No significant difference in tunnel positions was observed between Technique A and Technique B.
• Well-placed femoral tunnels correlated with significantly better Lysholm and IKDC scores.
• Surgeries performed within three months of injury showed significantly better hop test and IKDC scores compared to those done later.

Conclusions:

• Tibial tunnel placement was optimal in most cases and did not differ between techniques.
• Accurate femoral tunnel placement is associated with superior patient-reported outcomes.
• Early surgical intervention (within 3 months of injury) positively impacts functional recovery and patient-reported scores.