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Moataz Eltoukhy, Christopher Kuenze, Jeonghoon Oh, Eryn Apanovitch, Lauren Butler and Joseph F. Signorile

Anterior cruciate ligament (ACL) injury is one of the most common knee injuries among athletes, 1 , 2 with approximately 250,000 injuries every year in the United States. About 80,000 of these injuries occur in athletes younger than 18 years old. 3 About 70% of ACL injuries occur via noncontact

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Grant E. Norte, Katherine R. Knaus, Chris Kuenze, Geoffrey G. Handsfield, Craig H. Meyer, Silvia S. Blemker and Joseph M. Hart

Anterior cruciate ligament (ACL) injuries continue to constitute a common major joint injury among active individuals, often resulting in high economic costs, 1 reduced physical activity, 2 and decreased quality of life. 2 An estimated range of 80,000 to more than 250,000 ACL injuries are

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Travis Anderson, Sandra J. Shultz, Nancy I. Williams, Ellen Casey, Zachary Kincaid, Jay L. Lieberman and Laurie Wideman

Epidemiological research has shown female athletes are up to three times more likely to suffer a non-contact anterior cruciate ligament (ACL) injury than male athletes in similar sports ( Prodromos, Han, Rogowski, Joyce, & Shi, 2007 ). These ACL injuries and associated surgeries result in

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Yukio Urabe, Mitsuo Ochi and Kiyoshi Onari

Objective:

To investigate changes in muscle strength in the lower extremity after ACL reconstruction.

Design:

Prospective case series.

Dependent Variables:

Isokinetic muscle strength measured in 6 movements (hip extension/flexion, hip adduction/abduction, knee extension/flexion) and circumference of the thigh/calf.

Setting:

Clinic and home.

Patients:

44 (24 men, 20 women) between the ages of 16 and 47 years with an ACL rupture. All underwent reconstruction via a semitendinosus autograft.

Main Outcome Measures:

The peak torque for each joint movement was recorded. Repeated-measures ANOVA and power analysis were conducted to detect significant interaction effects.

Results:

The decline of muscle strength after ACL reconstruction remained not only in the knee extensors and flexors but also in the hip adductors.

Conclusion:

Rehabilitation programs that address the behavioral patterns and physiological characteristics of an ACL injury will benefit the athlete’s whole body and lead to a full recovery.

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Mina Samukawa, David Magee and Masaki Katayose

Context:

The effects of tibial rotation after ACL injury have not yet been well determined.

Objective:

To show whether clinical outcomes such as the amount of tibial rotation can affect functional outcomes in normal and ACL deficient knees.

Design:

Case control study.

Setting:

Research laboratory.

Participants:

Twenty normal subjects (Control) and 20 subjects with ACL deficient knees (ACL).

Main Outcome Measures:

Tibial rotation at 30 and 90 degrees of knee flexion was measured using an inclinometer. One-legged hop, crossover hop, figure-of-eight running and 10-m running tests were used and determined the effect(s) of tibial rotation on the outcome of the functional tests.

Results:

There were significant between-group differences in internal and external rotation. The relationship between external tibial rotation and the figure-of-eight index was significantly negatively correlated.

Conclusions:

The amount of tibial rotation is greater in ACL ruptured knees than in uninjured knees, and these greater amounts of tibial rotation affected the figure-of-eight running index.

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Akihiro Tamura, Kiyokazu Akasaka and Takahiro Otsudo

Injury of the anterior cruciate ligament (ACL) is common in high-impact sports. 1 However, approximately 70% of all ACL injuries reportedly occur in noncontact situations and only 30% occur in contact situations. 2 Moreover, females are more likely than males to have noncontact ACL injuries and

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Jessica E. Digiacomo, Riann M. Palmieri-Smith, John A. Redman III and Lindsey K. Lepley

Anterior cruciate ligament (ACL) injuries are among the most functionally disabling conditions in orthopedics, most commonly occurring in young athletes between the ages of 15 and 25. 1 , 2 The rate of injury is estimated at more than 200,000 times per year, with about 75% of individuals electing

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David M. Werner and Joaquin A. Barrios

injury 4 MCL∶2 PCL Meniscus tear 19 Graft type (HS∶PT∶Allo) 9∶12∶4 Abbreviations: ACLR, Anterior Cruciate Ligament Reconstruction; Allo, allograft; BMI, body mass index; HS, hamstrings; MCL, medial collateral ligament; NCAA, National Collegiate Athletic Association; PCL, posterior cruciate ligament; PT