What question did this study set out to answer?

To determine the effects of simulated quadriceps and hamstrings muscle loads on in situ forces in the anterior and posterior cruciate ligaments during high knee flexion exceeding 120 degrees.

November 25, 2003Journal of Orthopaedic Research®Open Access

In situ forces of the anterior and posterior cruciate ligaments in high knee flexion: An in vitro investigation

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Authors

GLGuoan LiXuzhou Medical College SZShay ZayontzCabrini Hospital EMEphrat MostExponent (United States)

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Implication

In vitro study reveals reduced cruciate ligament forces at high flexion in human knee specimens, indicating lower ligament strain during deep bending.

Key Points

To determine the effects of simulated quadriceps and hamstrings muscle loads on in situ forces in the anterior and posterior cruciate ligaments during high knee flexion exceeding 120 degrees.
Tested 18 fresh-frozen human knee specimens from full extension to 150 degrees of flexion using a robotic testing system.
Applied isolated quadriceps loads (400 N), isolated hamstring loads (200 N), and combined muscle loads (400 N quadriceps / 200 N hamstrings).
Calculated in situ ligament forces across flexion angles using the principle of superposition.
ACL force peaked at 30 degrees of flexion (71.7 +/- 27.9 N with quadriceps load, 52.3 +/- 24.4 N with combined load, and 32.3 +/- 20.9 N with hamstring load) and decreased to approximately 30 N under quadriceps load and 20 N under combined or hamstring loads at 150 degrees.
PCL force peaked at 90 degrees of flexion (34.0 +/- 15.3 N with quadriceps load, 88.6 +/- 23.7 N with combined load, and 99.8 +/- 24.0 N with hamstring load) and declined to approximately 35 N across all load conditions at 150 degrees.
Both cruciate ligaments carried significantly less force at high flexion angles compared to their peak loads at lower flexion angles under identical muscle loading conditions.

Cite This Study

Li et al. (2003) studied this question.

synapsesocial.com/papers/6a9548c119dbadbb777cf7bc https://doi.org/10.1016/s0736-0266(03)00179-7

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November 25, 2003Journal of Orthopaedic Research®Open Access

In situ forces of the anterior and posterior cruciate ligaments in high knee flexion: An in vitro investigation

View Full Paper

Ask AI

Bookmark

Authors

GLGuoan LiXuzhou Medical College SZShay ZayontzCabrini Hospital EMEphrat MostExponent (United States)

Discussion

Member takes

Implication

In vitro study reveals reduced cruciate ligament forces at high flexion in human knee specimens, indicating lower ligament strain during deep bending.

Key Points

To determine the effects of simulated quadriceps and hamstrings muscle loads on in situ forces in the anterior and posterior cruciate ligaments during high knee flexion exceeding 120 degrees.
Tested 18 fresh-frozen human knee specimens from full extension to 150 degrees of flexion using a robotic testing system.
Applied isolated quadriceps loads (400 N), isolated hamstring loads (200 N), and combined muscle loads (400 N quadriceps / 200 N hamstrings).
Calculated in situ ligament forces across flexion angles using the principle of superposition.
ACL force peaked at 30 degrees of flexion (71.7 +/- 27.9 N with quadriceps load, 52.3 +/- 24.4 N with combined load, and 32.3 +/- 20.9 N with hamstring load) and decreased to approximately 30 N under quadriceps load and 20 N under combined or hamstring loads at 150 degrees.
PCL force peaked at 90 degrees of flexion (34.0 +/- 15.3 N with quadriceps load, 88.6 +/- 23.7 N with combined load, and 99.8 +/- 24.0 N with hamstring load) and declined to approximately 35 N across all load conditions at 150 degrees.
Both cruciate ligaments carried significantly less force at high flexion angles compared to their peak loads at lower flexion angles under identical muscle loading conditions.

Cite This Study

Li et al. (2003) studied this question.

synapsesocial.com/papers/6a9548c119dbadbb777cf7bc https://doi.org/10.1016/s0736-0266(03)00179-7

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