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Direct measurement of resultant forces in the anterior cruciate ligament. An in vitro study performed with a new experimental technique.
Abstract
A new technique was used to measure the resultant forces in the anterior cruciate ligament during a series of loading experiments on seventeen fresh-frozen cadaver specimens. The base of the ligament's tibial attachment was mechanically isolated with a coring cutter, and a specially designed load-transducer was fixed to the bone-plug that contained the ligament's tibial insertion so that the resultant forces were directly measured by the load-cell. Although the magnitudes of values for forces varied considerably between specimens for a given test condition, the patterns of loading with respect to direction of loading and the angle of flexion of the knee were remarkably consistent. Passive extension of the knee generated forces in the ligament only during the last 10 degrees of extension; at 5 degrees of hyperextension, the forces ranged from fifty to 240 newtons (mean, 118 newtons). When a 200-newton pull of the quadriceps tendon was applied to extend a knee slowly against tibial resistance, however, the force in the ligament increased at all angles of flexion of the knee. Internal tibial torque always generated greater forces in the ligament than did external tibial torque; higher forces were recorded as the knee was extended. The greatest forces (133 to 370 newtons) were generated when ten newton-meters of internal tibial torque was applied to a hyperextended knee. Fifteen newton-meters of applied varus moment generated forces of ninety-four to 177 newtons at full extension; fifteen newton-meters of applied valgus moment generated a mean force of fifty-six newtons, which remained unchanged with flexion of the knee. The force during straight anterior translation of the tibia was approximately equal to the anterior force applied to the tibia. The application of 925 newtons of tibiofemoral contact force reduced the mean force in the ligament that was generated by 200 newtons of anterior pull on the tibia by 36 per cent at full extension and 46 per cent at 20 degrees of flexion.
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“This approach is limited to ex vivo applications.”
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“investigators have proposed a technique involving the isolation of the tibial attachment of the cruciate ligament by creating a bone plug and attaching a load sensor to measure the native ACL force in cadaveric knees [5, 6].”
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“studies demonstrated that passive flexion–extension motions do not load the ACL [5, 30]”
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Metadata
- Authors
- Markolf, K. L., Gorek, J. F., Kabo, J. M., & Shapiro, M. S.
- Affiliations
- University of California, Los Angeles (US)
- ORCID
- Markolf, K L
- Venue
- The Journal of Bone & Joint Surgery
- Published
- 1990-04
- Volume
- 72
- Issue
- 4
- Pages
- 557-567
- ISSN
- 0021-9355 (ISSN-L)
- OpenAlex
- W181468102
- Cited by
- 610
- References
- 0
- Citations by year
- 2026: 8 · 2025: 8 · 2024: 9 · 2023: 15 · 2022: 11 · 2021: 24 · 2020: 15 · 2019: 22 · 2018: 22 · 2017: 20 · 2016: 32 · 2015: 17 · 2014: 20 · 2013: 21 · 2012: 20
- FWCI
- 11.77
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Bone and Joint Surgery (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health (5r01ar037037-03)
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (R01-AR37037)
- Topics
- Health Sciences › Medicine › Surgery › Knee injuries and reconstruction techniques
- Physical Sciences › Engineering › Biomedical Engineering › Lower Extremity Biomechanics and Pathologies
- Health Sciences › Medicine › Orthopedics and Sports Medicine › Tendon Structure and Treatment
- Keywords
- anterior cruciate ligament, tibial attachment, knee hyperextension, tibiofemoral contact forces, anterior tibial translation, knee flexion angle
- MeSH terms
- Aged, Biomechanical Phenomena, Humans, Knee Joint, Ligaments, Articular, Middle Aged, Movement, In Vitro Techniques
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