Prospective cohort of 72 ACL-deficient patients divided equally into three groups: single-bundle, nonanatomic double-bundle, and anatomic double-bundle hamstring autograft reconstruction. A blinded examiner assessed knee stability before surgery and at 2 years. The study asks whether placing tunnels through the true anatomic footprint centers of both ACL bundles outperforms nonanatomic alternatives.
Earlier comparative studies found no benefit of double-bundle over single-bundle ACL reconstruction — but those double-bundle techniques placed the PLB tunnel at the 1:30 to 3:00 o'clock position, which this group's anatomic work showed is too anterior and proximal relative to the true PLB footprint.
This paper is why the word "anatomic" matters in ACL reconstruction discussions. When a colleague says "I do double-bundle," the relevant question is whether all four tunnel outlets are centered on the true bony footprints. Not just whether two femoral tunnels exist.
When evaluating ACL reconstruction technique, use this framework: nonanatomic double-bundle adds complexity without adding stability; only true anatomic placement of both AMB and PLB tunnels translates to measurable AP laxity (1.1 vs 2.8 mm) and rotational stability improvement.
One technical pearl worth owning: the PLB graft is maximally tensioned in full extension, so tensioning at 30° of flexion risks extension loss. The authors updated their recommendation to 30 N at 10° of flexion for anatomic double-bundle cases.
Prospective cohort of 72 ACL-deficient patients divided equally into three groups: single-bundle, nonanatomic double-bundle, and anatomic double-bundle hamstring autograft reconstruction. A blinded examiner assessed knee stability before surgery and at 2 years. The study asks whether placing tunnels through the true anatomic footprint centers of both ACL bundles outperforms nonanatomic alternatives.
Earlier comparative studies found no benefit of double-bundle over single-bundle ACL reconstruction — but those double-bundle techniques placed the PLB tunnel at the 1:30 to 3:00 o'clock position, which this group's anatomic work showed is too anterior and proximal relative to the true PLB footprint.
This paper is why the word "anatomic" matters in ACL reconstruction discussions. When a colleague says "I do double-bundle," the relevant question is whether all four tunnel outlets are centered on the true bony footprints. Not just whether two femoral tunnels exist.
When evaluating ACL reconstruction technique, use this framework: nonanatomic double-bundle adds complexity without adding stability; only true anatomic placement of both AMB and PLB tunnels translates to measurable AP laxity (1.1 vs 2.8 mm) and rotational stability improvement.
One technical pearl worth owning: the PLB graft is maximally tensioned in full extension, so tensioning at 30° of flexion risks extension loss. The authors updated their recommendation to 30 N at 10° of flexion for anatomic double-bundle cases.