Nonweight-bearing anterior knee laxity is related to anterior tibial translation during transition from nonweight bearing to weight bearing

We examined the relationship between anterior knee laxity (AKL), evaluated while the knee was nonweight bearing, and anterior translation of the tibia relative to the femur (ATT), evaluated when the knee transitioned from nonweight‐bearing to weight‐bearing conditions in response to an applied compr...

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Veröffentlicht in:Journal of orthopaedic research 2006-03, Vol.24 (3), p.516-523
Hauptverfasser: Shultz, Sandra J., Shimokochi, Yohei, Nguyen, Anh-Dung, Ambegaonkar, Jatin P., Schmitz, Randy J., Beynnon, Bruce D., Perrin, David H.
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container_end_page 523
container_issue 3
container_start_page 516
container_title Journal of orthopaedic research
container_volume 24
creator Shultz, Sandra J.
Shimokochi, Yohei
Nguyen, Anh-Dung
Ambegaonkar, Jatin P.
Schmitz, Randy J.
Beynnon, Bruce D.
Perrin, David H.
description We examined the relationship between anterior knee laxity (AKL), evaluated while the knee was nonweight bearing, and anterior translation of the tibia relative to the femur (ATT), evaluated when the knee transitioned from nonweight‐bearing to weight‐bearing conditions in response to an applied compressive load at the foot. Twenty subjects with normal knees (10 M, 10 F; 25.2 ± 4.1 years, 169.8 ± 11.5 cm, 71.6 ± 16.9 kg) underwent measurements of AKL and ATT of the right knee on 2 days. AKL was measured at 133N with the KT‐2000™. ATT was measured with the Vermont Knee Laxity Device and electromagnetic position sensors attached to the patella and the anteromedial aspect of the proximal tibia. Three trials for each measure were averaged and analyzed. Measurement consistency was high for both AKL (ICC = 0.97; SEM = 0.44 mm) and ATT (ICC = 0.88; SEM = 0.84 mm). Linear regression revealed that AKL predicted 35.5% of the variance in ATT (p = 0.006), with a prediction equation of YATT = 3.20 + 0.543(XAKL). Our findings suggest that increased AKL is associated with increased ATT as the knee transitions from nonweight‐bearing to weight‐bearing conditions. The potential for increased knee joint laxity to disrupt normal knee biomechanics during activities such as landing from a jump, or the foot strike phase of gait deserves further study. © 2006 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 24:516–523, 2006
doi_str_mv 10.1002/jor.20040
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Twenty subjects with normal knees (10 M, 10 F; 25.2 ± 4.1 years, 169.8 ± 11.5 cm, 71.6 ± 16.9 kg) underwent measurements of AKL and ATT of the right knee on 2 days. AKL was measured at 133N with the KT‐2000™. ATT was measured with the Vermont Knee Laxity Device and electromagnetic position sensors attached to the patella and the anteromedial aspect of the proximal tibia. Three trials for each measure were averaged and analyzed. Measurement consistency was high for both AKL (ICC = 0.97; SEM = 0.44 mm) and ATT (ICC = 0.88; SEM = 0.84 mm). Linear regression revealed that AKL predicted 35.5% of the variance in ATT (p = 0.006), with a prediction equation of YATT = 3.20 + 0.543(XAKL). Our findings suggest that increased AKL is associated with increased ATT as the knee transitions from nonweight‐bearing to weight‐bearing conditions. The potential for increased knee joint laxity to disrupt normal knee biomechanics during activities such as landing from a jump, or the foot strike phase of gait deserves further study. © 2006 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. 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Orthop. Res</addtitle><description>We examined the relationship between anterior knee laxity (AKL), evaluated while the knee was nonweight bearing, and anterior translation of the tibia relative to the femur (ATT), evaluated when the knee transitioned from nonweight‐bearing to weight‐bearing conditions in response to an applied compressive load at the foot. Twenty subjects with normal knees (10 M, 10 F; 25.2 ± 4.1 years, 169.8 ± 11.5 cm, 71.6 ± 16.9 kg) underwent measurements of AKL and ATT of the right knee on 2 days. AKL was measured at 133N with the KT‐2000™. ATT was measured with the Vermont Knee Laxity Device and electromagnetic position sensors attached to the patella and the anteromedial aspect of the proximal tibia. Three trials for each measure were averaged and analyzed. Measurement consistency was high for both AKL (ICC = 0.97; SEM = 0.44 mm) and ATT (ICC = 0.88; SEM = 0.84 mm). Linear regression revealed that AKL predicted 35.5% of the variance in ATT (p = 0.006), with a prediction equation of YATT = 3.20 + 0.543(XAKL). Our findings suggest that increased AKL is associated with increased ATT as the knee transitions from nonweight‐bearing to weight‐bearing conditions. The potential for increased knee joint laxity to disrupt normal knee biomechanics during activities such as landing from a jump, or the foot strike phase of gait deserves further study. © 2006 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. 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Orthop. Res</addtitle><date>2006-03</date><risdate>2006</risdate><volume>24</volume><issue>3</issue><spage>516</spage><epage>523</epage><pages>516-523</pages><issn>0736-0266</issn><eissn>1554-527X</eissn><abstract>We examined the relationship between anterior knee laxity (AKL), evaluated while the knee was nonweight bearing, and anterior translation of the tibia relative to the femur (ATT), evaluated when the knee transitioned from nonweight‐bearing to weight‐bearing conditions in response to an applied compressive load at the foot. Twenty subjects with normal knees (10 M, 10 F; 25.2 ± 4.1 years, 169.8 ± 11.5 cm, 71.6 ± 16.9 kg) underwent measurements of AKL and ATT of the right knee on 2 days. AKL was measured at 133N with the KT‐2000™. ATT was measured with the Vermont Knee Laxity Device and electromagnetic position sensors attached to the patella and the anteromedial aspect of the proximal tibia. Three trials for each measure were averaged and analyzed. 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subjects Adult
anterior cruciate ligament
anterior-posterior tibial displacement
Biomechanical Phenomena
Female
Humans
Joint Instability - diagnosis
Joint Instability - physiopathology
kinematics
Knee Joint - physiology
Male
Movement - physiology
Range of Motion, Articular - physiology
Tibia - physiology
Weight-Bearing - physiology
title Nonweight-bearing anterior knee laxity is related to anterior tibial translation during transition from nonweight bearing to weight bearing
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