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The Relationship of the Femoral Origin of the Anterior Cruciate Ligament and the Distal Femoral Physeal Plate in the Skeletally Immature Knee

An Anatomic Study

Sports Medicine and Shoulder Service, Hospital for Special Surgery, New York, New York

* Address correspondence and reprint requests to George A. Paletta, Jr., MD, Washington University Department of Orthopaedic Surgery, One Barnes Hospital Plaza, Suite 11300, St. Louis, MO 63110

We defined the anatomic relationship of the anterior cruciate ligament femoral origin to the distal femoral physis in the skeletally immature knee with use of 12 fresh-frozen human fetal specimens (ages, 20 to 36 weeks). Each specimen underwent magnetic resonance imaging, was dissected free of soft tissue, sectioned in the sagittal plane, and stained. The spatial relationship of 1) the epiphyseal side of the physeal proliferative zone to the nearest point of bony attachment of the anterior cruciate ligament and 2) the origin of the anterior cruciate ligament to the over-the-top position were measured. The same measurements were made in 13 skeletally immature knees (ages, 5 to 15 years). We found that the femoral origin of the fetal anterior cruciate ligament developed as a confluence of ligament fibers with periosteum at 20 weeks, vascular invasion into the epiphysis at 24 weeks, and establishment of a secure epiphyseal attachment by 36 weeks. In the fetus, the distance from the anterior cruciate ligament femoral origin to the epiphysis was 2.66 ± 0.18 mm (range, 2.34 to 2.94). There was no significant change in this distance in adolescent specimens (2.92 ± 0.68 mm; range, 2.24 to 3.62). The over-the-top position was at the level of the distal femoral physis.

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