Research and News
Posts tagged ACL
Thera-Band exercise program can improve lower limb biomechanics in females
Jan 30th
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Female athletes are particularly susceptible to anterior knee pain and injury to their anterior cruciate ligament (ACL). This increased risk is thought to result from poor dynamic control of the hip and knee, particularly when the foot hits the ground. The inability to control hip adduction, knee valgus, and internal rotation in the transition from an open- to closed-chain position of the leg may result from weakness of the hip abductor and external rotator muscles.
Researchers have suggested that females have weakness of their hip abductors, extensors, and external rotators (Prins et al. 2009). Exercise programs using Thera-Band® elastic resistance for females with anterior knee pain have been successful and featured previously in the Academy blog. These programs include core stabilization, as well as hip and knee strengthening exercises.
In the January 2012 journal, Medicine and Science in Sports and Exercise, Brazilian researchers published a study of 28 healthy female athletes. They wanted to determine if their exercise program could improve lower limb biomechanics, which theoretically may help reduce injuries. The subjects were assigned to either an 8 week training group or non-exercising control group.
The More >
Balance training improves risk factor for ACL injury
Jun 20th
Anterior cruciate ligament (ACL) tears are often detrimental to an athlete’s season. Biomechanical analysis of the lower extremity suggests that cutting maneuvers increase the load on the ACL by increasing valgus and internal rotation forces when the knee is extended. While reconstructive surgery and rehab are often successful, it’s obvious that preventing ACL injuries through training and conditioning would be beneficial.
Some controversy exists regarding the optimal method of training for preventing ACL injuries in athletes. Researchers recruited 50 Australian Rules football players and randomly assigned them to one of 4 training programs: machine weights, free weights, balance training, and machine weights plus balance training. The balance training groups performed exercises using balance boards, mini trampolines, inflatable disks, and exercise balls. Subjects were tested before and after the 12-week programs for knee loads during running and cutting maneuvers. The balance training group significantly decreased their peak valgus and internal rotation moments during the cutting maneuver, which may help reduce the risk of ACL injuries.
In contrast, the strength training groups (machine weight and free weight) tended to increase their knee loads that place stress on the ACL. The authors recommend that athletes perform balance training to reduce the risk of ACL injury. This More >
Proprioceptive training reduces injury rates and recovery time in female soccer players
Oct 28th
Proprioceptive exercise training has been shown in several studies to reduce soccer injury rates. Unstable surfaces such as Thera-Band® Stability Trainers, Stability Discs, and balance boards can be part of an effective proprioceptive training program. Several studies have shown reductions in ACL tears and ankle sprains which are considered “non-contact” injuries. German researchers hypothesized that the same preventive effects of proprioceptive training may apply to other lower extremity injuries, namely hamstring, patellar tendon, and Achilles tendon injuries. They implemented a multi-station soccer-specific exercise program involving jumps and balance training on a wobble board with the Premier League female soccer team, Bayern Muenchen. Their results were published in the American Journal of Sports Medicine.
At the end of the 3 year intervention, non-contact hamstring injury rates were significantly reduced 64%, from 22.4 to 8.2. Patella tendon injuries were reduced by 67% (3 vs. 1) and achilles injuries reduced by 100% (1.5 to 0). The mean time lost to injury for the players also significantly decreased from 14.4 days to 1.5 days. In addition, the researchers identified a dose-effect of the training: the more time spent balance training, the lower the rate of injuries.
This study suggests that implementing soccer-specific proprioceptive training can reduce non-contact and More >
Neuromuscular exercise program effective for ACL Rehabilitation
Mar 16th
Rehabilitation after ACL reconstruction usually involves 6 months of physical therapy, including strength and balance exercises. Traditional ACL rehab has focused on increasing strength of knee and lower extremity muscles. More recently, “neuromuscular” exercise programs that de-emphasize strength training have been used successfully in Europe.
Physical therapy researchers in Norway compared 2 types of ACL rehabilitation in 74 post operative patients. In the study, published in the American Journal of Sports Medicine, patients were randomly assigned to a traditional exercise program or a neuromuscular exercise program. The neuromuscular program (described in a separate study) included balance exercises on foam pads, wobble boards, and mini-trampolines. Download their rehabilitation protocol here. Plyometric and agility exercises were also included. Each group was tested for their strength, pain, function, and quality of life.
At a 2-year follow-up, the neuromuscular exercise group significantly increased in function and pain compared to the strengthening group, while the strengthening group only improved in hamstring strength. The authors suggested that both balance and strength exercises be included in ACL rehabilitation program. Thera-Band® Stability Trainers and balance boards are ideal for use in a neuromuscular rehabilitation program.
Reference: Risberg MA, Holm I. The long-term effect of 2 postoperative rehabilitation programs after anterior cruciate ligament reconstruction: a randomized controlled clinical trial More >
Thera-Band® program helps improve lower extremity strength and biomechanics in female athletes
Feb 1st
Anterior cruciate ligament (ACL) tears occur in about one in every 3000 Americans; 80% of these injuries are non-contact, often requiring surgical reconstruction. Female athletes have a higher incidence of ACL injury, likely due to biomechanical differences compared to males. Research has focused on exercise programs that help improve these biomechanics in order to prevent ACL injuries. Dr. Dan Herman MD, PhD received a research award from Thera-Band Academy to investigate the effects of a strengthening program on jump-landing biomechanics of female athletes at the University of North Carolina. The protocol utilized Thera-Band® elastic bands and exercise balls.
Initially, Dr. Herman published a study concluding that while the protocol was effective at improving strength, the biomechanics of the athletes remained unchanged. He concluded that strengthening alone was not sufficient, and set out to find what needed to be combined with the training program. His subsequent study combined the Thera-Band strengthening protocol with video-assisted feedback, and he compared the combined intervention to a group receiving feedback only. Dr. Herman and his colleagues found that the group receiving both feedback and strengthening improved their biomechanics more than the feedback-only group. The paper won the 2008 O’Donoghue award from the American Orthopedic Society for Sports Medicine, given to the best More >
