Woo et al. tested 27 pairs of cadaveric human knees across three age groups to determine how donor age and testing orientation affect the structural properties of the femur-ACL-tibia complex. The study used a custom apparatus allowing true anatomical ACL alignment during tensile loading at 30° of knee flexion. Results established new biomechanical benchmarks that supersede prior literature and directly inform ACL graft selection.
Every ACL graft you select is benchmarked against this paper. The 2160 N ultimate load and 242 N/mm stiffness from anatomically tested young donors are the reference values in ROCK and Miller's — numbers that appear directly on the OITE.
When evaluating allograft tissue, donor age matters as much as graft type. A tibialis anterior from a 70-year-old carries roughly one-third the load capacity of the same graft from a 25-year-old. This paper is the reason donor age is a documented variable in allograft procurement and why young-donor tissue is preferred for ACL reconstruction.
When you perform a Lachman test at 30° and find more laxity than the anterior drawer at 90°, that is not a clinical quirk. This paper quantifies exactly why: AP displacement is 45% greater at 30° in young knees, and 34% greater in middle-aged knees.
One nuance worth knowing: the intact knee's AP laxity does not change with age, because all periarticular structures share the load at 100 N. It takes isolated tensile testing of the FATC to unmask age-related ACL deterioration. A reminder that clinical exam alone can underestimate structural ACL compromise in older patients.
Woo et al. tested 27 pairs of cadaveric human knees across three age groups to determine how donor age and testing orientation affect the structural properties of the femur-ACL-tibia complex. The study used a custom apparatus allowing true anatomical ACL alignment during tensile loading at 30° of knee flexion. Results established new biomechanical benchmarks that supersede prior literature and directly inform ACL graft selection.
Every ACL graft you select is benchmarked against this paper. The 2160 N ultimate load and 242 N/mm stiffness from anatomically tested young donors are the reference values in ROCK and Miller's — numbers that appear directly on the OITE.
When evaluating allograft tissue, donor age matters as much as graft type. A tibialis anterior from a 70-year-old carries roughly one-third the load capacity of the same graft from a 25-year-old. This paper is the reason donor age is a documented variable in allograft procurement and why young-donor tissue is preferred for ACL reconstruction.
When you perform a Lachman test at 30° and find more laxity than the anterior drawer at 90°, that is not a clinical quirk. This paper quantifies exactly why: AP displacement is 45% greater at 30° in young knees, and 34% greater in middle-aged knees.
One nuance worth knowing: the intact knee's AP laxity does not change with age, because all periarticular structures share the load at 100 N. It takes isolated tensile testing of the FATC to unmask age-related ACL deterioration. A reminder that clinical exam alone can underestimate structural ACL compromise in older patients.