After an ACL Injury: Physical Therapist Explains Quadriceps Strengthening Progression

After an ACL Injury: Physical Therapist Explains Quadriceps Strengthening Progression

The anterior cruciate ligament (ACL) is a supportive structure inside the knee joint. After it is injured, there are many important areas to focus on during recovery including range of motion, flexibility, strength, balance and core strength. Each of these areas, as well as mechanics with running, jumping, sprinting and cutting, must return to normal before returning to sports.
One area that requires extra attention during recovery is the quadriceps (quad), a group of muscles on the front of the thigh extending to the knee. Due to an injury and after surgery, the body’s response is to “turn off” the nerves to the quadriceps muscle.
What is persistent quadriceps weakness?
Some athletes have quadriceps weakness, and this takes longer to get stronger than other muscles. Unfortunately, this weakness can last years, and bodies will find ways to compensate for quadriceps weakness. However, you may be able to do activities like running and jumping while still having poor quad strength. This is because your hips and ankles are able to compensate, which “hides” quadriceps weakness. This continued weakness can change the way the knee is loaded when running and jumping, which might stress the joint over time.
What is the best way to strengthen the quad muscle?
“There are ways to strengthen the weak quad muscle in isolation,” Physical therapist Jacob Landers, P.T., D.P.T.,O.C.S., CSCS says. “Using a knee extension machine is the most efficient exercise for strength training.” Ideally, strength training should occur three times per week.

Finding the correct weight to use can be difficult, but here are some helpful tips:

  • Set the weight to a challenging amount and attempt as many reps as possible.
  • Try to do a full set with both legs and then repeat the exercise with one leg.
  • If you can do more than 10 reps, add more weight and try again.
  • Repeat this process until the maximum number of reps you can complete is less than 10. This will be your starting weight.

 What comes next?

“Once you have built a base of quad strengthening throughout the first couple of months, work on training different aspects of strength, such as explosiveness and deceleration,” Landers says. Work on performing this quadriceps exercise at faster speeds or performing the lowering phase of the exercise more slowly. Ask for guidance from a strength and conditioning coach or physical therapist for other variations.
This training should be part of a comprehensive program for athletic readiness. Want to know how you can work with our team at Scottish Rite for Children? Read about our bridge program and sign up today!

Study Looks at Re-Injury Rate After ACL Reconstruction in Young Athletes

Study Looks at Re-Injury Rate After ACL Reconstruction in Young Athletes

Wrapping up his third year as a medical student at UT Southwestern Medical School, Craig Kemper, B.B.A., has participated in several projects with the Center for Excellence in Sports Medicine research team. Kemper was the lead author on a project looking at athletes who were back to sport after an anterior cruciate ligament (ACL) tear and reconstruction that was recently presented at the 39 annual meeting of the Mid-America Orthopaedic Association. The organization comprises orthopedic surgeons from 20 states, including Texas.

After surgery for the “primary” ACL tear, as many as 1 in 4 young athletes re-tear the reconstructed ACL or the ACL in the other knee. The rate for these “secondary” ACL tears in young athletes is a concern for researchers and clinicians in pediatric sports medicine. This review included patients seen over three years at Scottish Rite for Children for an ACL tear and reconstruction to determine whether participation in multiple sports protects against re-injury.

The 145 patients in the study were

  • an average age of 14 years.
  • 50% male, 50% female.
  • > 50% reported playing only one sport (single-sport athletes)
    • Most played soccer.
    • On average, these athletes returned to sports in fewer days than multi-sport athletes.

Kemper says young athletes continue to feel pressured to choose one sport at earlier ages to “not be left behind.” Many recommend multi-sport participation to help an athlete develop varied skills and protect from overuse injuries unique to growing children, including apophysitis and osteochondritis dissecans.

“We give this advice, but we aren’t sure if it applies to this population regarding re-injury after an ACL reconstruction,” says co-author and Medical Director of Clinical Research, Henry B. Ellis, M.D. “The time out of sports is already so long for an ACL tear, we are eager to learn all the variables that contribute to re-injury rates. Other studies have looked at surgical techniques, but this one looks at sport-participation and time to return-to-play.”

Although single-sport athletes were cleared to return to sports in a shorter time than multi-sport athletes, the analysis found no difference in the rate of secondary ACL injuries within two years of follow-up for this group. “Results like this are still helpful and give direction for future projects,” says Ellis. “More importantly, they help me as a pediatric orthopedic surgeon know how to counsel my patients.”

 

SINGLE-SPORT ATHLETES NOT EXPERIENCING INCREASE IN SECONDARY TEAR INCIDENCE DESPITE EARLIER CLEARANCE, Craig Kemper, B.B.A., K. John Wagner, III, B.S., Connor M. Carpenter, B.B.A., David E. Zimmerhanzel, B.S., Philip L. Wilson, M.D., Henry B. Ellis, M.D.

Learn more about ACL injuries on our website.

The Comeback Kid

The Comeback Kid

Cover story previously published in Rite Up, 2021 – Issue 3.

by Hayley Hair

The Comeback is Bigger Than the Setback

On the wide-open field under the scorching summer sun, soccer player Lillian lines up her kick and launches the soccer ball through the air hurtling toward the goal. Today she’s in practice leading up to her select soccer team’s upcoming season. Last fall’s season looked dramatically different as an anterior cruciate ligament (ACL) rupture and meniscus tear took 12-year-old Lillian and her parents not only by surprise but also, unfortunately, out of the game.

“I was in the far corner and a girl hit me from the side,” Lillian says. “I heard several pops, and then I was on the ground in tears. It was just the most painful thing.” Lillian was able to limp away after the injury, but it hurt, and the pain persisted. Lillian’s mother, Debbie, set up a doctor’s appointment to have Lillian’s knee examined. “I had this vision that an ACL injury was excruciating, and you couldn’t walk,” Debbie says. “She was in pain, but not what I thought it would look like. It hurt, but she was mobile.”

Following X-rays and an MRI, Lillian’s injury was confirmed. “Just hearing the doctor say, ‘torn ACL,’ I couldn’t think of anything. My mind just stopped,” Lillian says. Later that day and feeling overwhelmed about her future sports goals, Lillian searched online to find out what professional athletes experienced injuries like hers. Then she saw her soccer idol’s name pop up on the list. “It’s happened to a lot of professional players, like Alex Morgan, who I’ve looked up to my entire life. That kind of comforted me.”

The Ins and Outs of ACL Injuries in Children

The ACL is a stabilizing ligament in the central part of the knee that stabilizes translation and rotation of the joint and is typically injured in pivoting, twisting and agility sports. Over the last several decades, recognition of ACL injuries has increased, and rupturing the ACL is particularly common in female soccer.

One hears about torn ACLs frequently in adult sports, but what happens when the injury presents in children? Lillian’s X-rays showed that her growth plates were still open, signaling plenty of growing in her future, so her best bet for care would be provided by a pediatric orthopedic specialist. She was referred to Scottish Rite for Children’s Orthopedics and Sports Medicine Center in Frisco and into the care of pediatric orthopedic surgeon Philip L. Wilson, M.D., assistant chief of staff and director of the Center for Excellence in Sports Medicine.

For a growing athlete, the experts at Scottish Rite for Children have unparalleled experience providing non-operative and arthroscopic care to treat common sport-related injuries including concussions, ligament injuries and cartilage conditions in the knee, ankle, shoulder, elbow and hip.

“Some ACL injuries may not need to be reconstructed if there are no cartilage injuries or shifting or instability of the knee,” Wilson says. “Unfortunately, this is less common, and despite rehabilitation, many children need surgery due to laxity in their ligaments and their high activity levels.” For Debbie and Sergio, Lillian’s parents, Wilson was the perfect fit for determining their daughter’s care.

“Dr. Wilson sat with me and my daughter and answered every question I had under the sun about the data, his experience and his research. He was an open book about everything,” Debbie says. “The whole team was positive. They made us feel like we had a great plan in place and that it’s all going to be just fine.”

The Right Surgical Technique for Patients Like Lillian

That research Wilson reviewed with the family is the novel ACL surgical technique for growing athletes that he and pediatric orthopedic surgeon Henry B. Ellis, M.D., created and subsequently published in the American Journal of Sports Medicine and presented at the annual meetings of the Pediatric Orthopedic Society of North America and the American Orthopedic Society of Sports Medicine.

“We have found in our research at Scottish Rite studying a particular technique that we developed that this can cut ACL reinjury rates in half,” Wilson says. “Female adolescent soccer players, like Lillian, have a particularly high risk of reinjury, sometimes as high as 25%, which is the highest that we have recorded in youth and young adult sports. Adding the stabilizing ligament helps reduce that reinjury risk. She also had cartilage repair, which is common is 70% in our ACL injury population.”

Lillian had a quadriceps tendon autograft for her ACL repair. She also had a lateral tenodesis with her iliotibial band, which means Wilson used a strip of tissue from the side of the knee to add a secondary stabilizing ligament that helps control rotation and protect the knee.

“There’s nothing you can tell a parent to put them at ease when their child is going through the actual procedure,” Sergio says. “There’s nothing routine when someone puts your child under anesthesia, but when you are in a facility like Scottish Rite, in a place where the doctors are proven performers, that gives you peace of mind.”

Scottish Rite provides world-class care for patients including access to psychologists, nutritionists, physical therapists, athletic training staff, specialized nurses, advanced practice providers and many others who play a significant role in ensuring complete physical and mental readiness to return to play. “We are fortunate to have the resources to take care of the whole patient,” Wilson says. “We also have a keen interest in the research surrounding these injuries and contribute to that research in terms of factors predictive of injury, surgery techniques, patient outcomes and potential complications of treatment.”

Novel ACL Reconstruction Diagram

Returning to Sports After Surgery and Physical Therapy

Finding the proper treatment and completing the surgery are a huge jump start to recovering from an ACL injury, but getting back on the field and ready to safely return to competitive game play takes time. For Lillian, it was nine months.

“When you see your child be very physically active, and then one day, it all comes crashing down, that for me as a parent was deeply concerning,” Debbie says. “I knew the journey to get anywhere near that level of activity again was going to be many, many months.”

By helping Lillian understand that recovery could take up to a year, Wilson worked alongside the family to get her healthy both physically and mentally to return to soccer. “Every time I went to visit him, he said I was doing great and healing ahead of schedule, and that made me want to work even harder,” Lillian says. “I pushed my hardest through every single drill and activity I did, and here I am, and I feel better than ever.”

Wilson says the biology of internal healing in the knee takes at least nine months. That time allows for the new ligament graft to heal to the bone and grow a blood supply. That also includes building back the muscle and strength to regain control of the leg to protect the surgically constructed knee. “Return prior to that time leads to increased reinjury rates,” Wilson says. “Scottish Rite has a stepwise progression of strengthening, agility and neuromuscular control activities to help prepare patients to return to sports.”

Following Scottish Rite’s well-established, highly successful physical therapy program, Wilson recommended Lillian participate in Scottish Rite’s training classes to foster further recovery and prepare for the functional testing and physician’s clearance required for her to safely return to soccer. Following months of rehabilitation, many patients need additional strengthening and emotional support to trust their injured leg, beyond what can typically be received during traditional physical therapy. “I just felt so much comfort even though I didn’t know anyone there,” Lillian says. “Being around the people who have had an injury and who are around my age, it just felt so heartwarming. We would help each other no matter what, and it was just an amazing feeling.”

Back on the Field

Lillian followed her sports medicine team’s instructions very closely. With a great deal of hard work, and added support and encouragement from her parents and her teammates, she successfully passed her functional test.

The new soccer season has arrived, and Lillian’s parents love seeing her back out there. “Whenever you have to see them take their first tumble to the ground, you kind of hold your breath, but she popped right up,” Debbie says. “She just needs to be playing and doing what she loves. For the longer term, the more she’s out there, the more she’s going to learn to trust that knee.”

Lillian has learned a great deal during her ACL injury recovery and from her care at Scottish Rite for Children. “Throughout my entire recovery, I always had one quote in the back of my head — ‘the comeback is always stronger than the setback,’” Lillian says. “I carried that with me throughout my entire recovery. It’s been quite an experience, but I think it’s going to all be worth it.”

Read the full issue.

Functional Testing: Why is it Important for Athletes Returning to Sports?

Functional Testing: Why is it Important for Athletes Returning to Sports?


There are many factors to consider before releasing a young athlete back to sports after an injury. Our sports physical therapists and sports medicine physicians continually review and discuss the latest evidence on risk factors for injuries in young and growing athletes. Most of these studies evaluate the risk of injury after an anterior cruciate ligament (ACL) reconstruction and consistently state that as many as 1 in 4 will re-tear the same or have a new injury to the opposite ACL when returning to sports.

Our pediatric sports medicine clinical and research staff often discuss how we know when it is safe to allow an athlete to go back to sports. Here are a few examples of the questions that come up in these conversations:

  • How old is the patient?
  • Has the actual tissue had time to heal since the procedure?
  • Does the athlete plan to play a sport or position that puts them at greater risk?
  • Is the athlete mentally ready and confident to get back in the game?
  • Is it the beginning of the season or does the athlete have several months before competition season?
  • Has the athlete regained full strength and mobility since the injury?
  • Has the rest from the recovery caused the non-injured leg to become weak?
  • Can the athlete safely perform the necessary movements required in the sport(s)?

We continue to study these questions, and many others, to help us make the best decisions for our athletes. Since many of these questions are based on an athlete’s physical strength and ability to move, movement analysis is a critical component of this process. Our movement analysis testing, also known as the functional testing protocol, takes into consideration many aspects of movement to identify who is most at risk of being injured again. The results can be simplified into pass or fail. However, the tests identify specific areas for the athlete to improve before retesting.

Our goals are to get athletes back to sports, keep them in sports and prevent injuries in the future. With tools like these, we can make recommendations based on objective findings. We can also demonstrate to athletes and families, who may be at risk for re-injury, exercises to strengthen areas of weakness.

Learn more about our research in pediatric sports medicine.

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