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Understanding Hip Impingement in Teens: How it Happens and How to Prevent It

Understanding Hip Impingement in Teens: How it Happens and How to Prevent It

by | Jun 17, 2024 | Sports Medicine

Also commonly referred to as hip impingement, femoroacetabular impingement is a painful condition that occurs in the hips of adolescents and young adults. Two bones fit together to make up this “ball and socket” joint including the head of the femur (ball), which is part of the thigh bone, and the acetabulum (socket), which is part of the pelvis.

Impingement, or pinching, causes pain when the bones in the hip joint pinch the labrum, the soft tissue on the perimeter/edges of the acetabulum.
There are three types of FAI:

  • Cam impingement occurs when the shape of the femoral head or ball is abnormal.
  • Pincer impingement occurs when the shape of the acetabulum or socket is abnormal.
  • Combined impingement occurs when both the ball and the socket are abnormal.

Pediatric orthopedic surgeon Henry B. Ellis, M.D., says, “Repetitive activities make changes in the joints. In the hip, either the soft tissues become damaged, the bone actually changes its shape or both of these occur.” The reason for abnormal bone shape is not known. It may occur during development or may be in response to activity.

Symptoms of hip impingement are more likely to occur in those who perform:

  • Repetitive maximal flexion (bending) of the hip, such as deep squatting or high kicking.
  • Repetitive movements in activities, such as running, dance, gymnastics and hockey.

What are the symptoms of femoroacetabular impingement?

  • Pain in the hip or groin, typically in the front.
  • Tenderness and/or swelling of the hip or groin area.
  • Stiffness or pain after sitting for long periods of time.
  • Aching or pain that worsens with certain activities.

How is it diagnosed?
A thorough history and physical examination are used to diagnose a hip impingement. In most cases, X-rays are used to further assess the shape and fit of the bones. If symptoms do not improve or worsen, additional imaging such as an MRI or MR arthrogram may be recommended to further evaluate the soft tissue, the acetabular labrum. An MR arthrogram uses MRI, fluoroscopy and sometimes an injected medication to show the structures inside the joint.
 
How is it treated?
Treatment depends upon the severity of the condition and typically begins with a nonoperative approach which typically includes resting from activities that cause pain or changing to activities that do not. Other treatment options include physical therapy, joint injections or arthroscopic surgery may be required.
 
In a recently published article “Risk Factors for Suboptimal Outcome of FAI Surgery in the Adolescent Patient”*, Ellis and others reported findings after reviewing 126 hips (114 patients) under the age of 18 who were being treated for symptomatic FAI. This work helps Ellis and his colleagues around the country provide better counseling to patients considering surgery for FAI.
 
Early recognition and treatment are important because hip impingement has been shown to be a risk factor for early development of osteoarthritis of the hip.
 
How can hip impingement be prevented?
Overuse injuries like hip impingement and FAI occur with a high volume of training, repetition of certain movements and early specialization in a sport.
 
“Hip impingement in a growing child is bad news. We need to help them monitor and modify their volume of repetitive activities to prevent the condition from worsening, or even better, developing.”

  • Henry B. Ellis

These suggestions can help to prevent FAI and other similar overuse conditions:

  • Avoid sports specialization and play multiple sports throughout high school.
  • Emphasize moderation with load and training.
  • Encourage free play and lifetime sports like cycling and hiking.
  • Avoid year-round participation and encourage weekly and seasonal rest from activities requiring repetitive maximal flexion of the hip.
  • Perform proper warm-up and conditioning for all activities.                                                           

Learn more from Ellis about Hip Injuries in Young Athletes.
 
*Yen, Y. M., Kim, Y. J., Ellis, H. B., Sink, E. L., Millis, M. B., Zaltz, I., Sankar, W. N., Clohisy, J. C., Nepple, J. J., & ANCHOR Group (2024). Risk Factors for Suboptimal Outcome of FAI Surgery in the Adolescent Patient. Journal of pediatric orthopedics, 44(3), 141–146.

Keeping Up with the Count: Hip Health in Dancers

Keeping Up with the Count: Hip Health in Dancers

by | Oct 20, 2021 | Sports Medicine

Dancers and other performing artists place demands on their hips that are unlike those of other athletes. Movements push the range of motion of their hips to extreme ends from an early age. They must have the flexibility for turnouts, leaps, or grand battements, and also absorb dramatic forces from leaps and jumps. All of this while maintaining impressive limb control and stability of their support and gesture limbs over sustained periods.

Key Considerations for Hip Health for Dancers

  1. Mobility in the hip and surrounding muscles.
  2. Balance and stability in the pelvis and core.
  3. Managing training volume.

Hip Mobility
Turnout and extreme ranges of motion during dancing and other performing arts often require more than “normal” hip mobility. For some, the end of the thigh bone in the hip is naturally in a position of retroversion, which allows for the extreme external rotation needed for turnouts. Others have soft tissue laxity, also called joint hypermobility, that predisposes them to successfully achieve the extremes in rotation, extension, flexion, and abduction (out to the side, such as a la seconde) required for their art form. Dancers with natural hypermobility may be more likely to continue, whereas others may “self-select” out of the sport.

Dancers that are not born with these factors may acquire laxity in the joint with many years of training and aggressive stretching of the muscles and soft tissue that make up the hip capsule.

Proper supervision and a comprehensive program are necessary to ensure the stretching does not cause hypermobility in the lower spine. Additionally, extreme motions may cause damage to the labrum, a soft tissue rim that stabilizes the hip in the socket. Therefore, prompt response to signs of pain with mobility should be addressed to avoid damage to the soft tissue, and ultimately the bones in the hip.

Pro Tip: When the core stabilizer muscles don’t support the lower spine, the hip muscles, including the flexors or hamstrings, are forced to provide support. This protective tightness is an undesirable compensation and can be corrected by doing core stabilization exercises.

Pelvic and Core Stability
Mobility of the hip and leg is dependent on having a stable platform. Core stability means abdominal strengthening to many, but there are deeper muscles that must be considered, including:

  • Gluteal muscles – deep hip rotators that help to maintain active turnout and appropriate knee alignment in the posture leg with grand plies and more.
    • Gluteus maximus (hip rotation and extension)
    • Gluteus medius (hip rotation and abduction)
  • Transverse abdominis – deep abdominal muscles

Imbalances and weakness of these muscles cause stress on other joint tissues, including the capsule, labrum, and ligaments. Stretching or stressing beyond their limits can cause pain and injuries in those non-muscular tissues, which then shifts more demand to the muscles around the hip to provide extra support at end ranges of motion. The body then uses other muscles like the hip flexors to stabilize the hip and support a high volume of hip flexion with a turned-out leg, as seen in dance.

A consequence of this demand or overuse of a muscle is muscle tendinitis, the inflammation of the tendon part of a muscle. This condition worsens when there are sudden spikes in the frequency or duration of training, particularly when there is inadequate support from the core to control the pelvis during repeated hip flexion movements.

Stability Exercises:

Abdominal Hollowing Technique
To prevent this chain of compensation, a dancer can learn how to activate the transverse abdominis, the deep abdominal muscles. These muscles help to create a stable base prior to limb movement. Activation of these muscles is described as a “hollowing” technique as the belly button is pulled inward toward the spine. This contrasts with a “bracing” technique that activates the superficial abdominals.

Pro Tip:
A dancer should be able to do an active straight leg raise without any arching of the lower back during the movement. For added abdominal/core muscle activation, use a band for a pull-down during the straight leg raises. This prepares a dancer for flexion associated with high kicks and grand battements without anterior pelvic tilt.

Gluteal Medius Strengthening

Example exercises:

  1. Single leg glute bridge
  2. Kneeling, side plank, hip abduction raises
  3. Clamshell side planks
  4. Side plank development

Pro Tip: It is important to learn to use the gluteus medius instead of the spinal muscles, called the quadratus lumborum, with abduction motions out to the side (a la seconde) or in the posture leg.

Manage Training Volume
Poor form and muscle fatigue can cause undesirable compensations with other soft tissues and muscles, and may lead to direct tissue injury in the joints or muscles. As overuse injuries worsen with time, performance suffers when the muscles are fatigued.

Pay attention to sudden increases in training duration or intensity, such as fall preparation for The Nutcracker, when added to typical training classes because it can leave a dancer vulnerable to injury. Dancers should take a day off one to two times each week for recovery. Proper rest can help prevent injuries, so you stay healthy throughout the season.

Recognizing Adolescent Hip Conditions

Recognizing Adolescent Hip Conditions

by | Aug 21, 2019 | Hip Disorders

Key messages from a presentation by staff orthopedist, David A. Podeszwa, M.D., at Coffee, Kids and Sports Medicine. Article originally published in first quarter, 2018 issue of Pediatric Society of Greater Dallas newsletter. 

Watch the lecture
Print the PDF

Recognizing Hip Conditions in the Pre-Teen and Teenager

Kids of all ages complain frequently of aches and pains around the hip and it is really easy to brush them
off. I would be lying if I said that I haven’t done it to my own children. For the super-active child/teen who participates in high impact activities year-round, it is easy to explain away complaints of hip pain as simple overuse. The combination of anti-inflammatories, stretching and playing through the pain is a common remedy. At the opposite end of the spectrum is the video gamer or book lover who is more sedentary and less interested in exercise. Their complaints of hip pain are easily attributed to deconditioning and weakness. Becoming more active is the simple remedy. Unfortunately, not all hip pain can be ignored. Missing certain conditions early in their presentation can have significant long-term pain and functional consequences. Below are several important pearls to remember that will help you avoid missing a serious hip condition when evaluating a patient with hip pain.

  1. Hip disorders can present with hip or knee pain. Sorting out the etiology and location starts with a good history and physical exam. Is the chief complaint pain, limp, or decreased motion? Some disorders can present without pain and only a limp. Where does it hurt? Hip disorders can present with hip (anterior, lateral, groin), thigh or knee pain. Complaints of constant pain that does not resolve with rest, is worse with weight bearing, limits hip range of motion, and is not improved with anti-inflammatories should be red flags for a significant underlying condition. Physical exam may demonstrate pain with palpation at the anterior superior iliac spine, iliac crest, and or greater trochanter. Pain with range of motion or significant asymmetry in hip range of motion should also be concerning.
  2. Children and adolescents do not get “groin pulls.” Recurrent limping and/or hip pain (especially groin pain) unresolved with rest is likely to have an underlying etiology. “Groin pull” is an easy answer, but it is never the correct one.
  3. An adolescent limping with his/her foot turned out and complaining of hip or knee pain has a slipped capital femoral epiphysis (SCFE) until proven otherwise by an AP and frog-lateral of both hips. Range of motion of the hip will likely be painful, especially with internal rotation when the hip is flexed. In severe cases, there will be obligate external rotation (and often abduction) when flexing the hip. In addition, any pre-teen or teen who presents with thigh or knee pain should have their hips examined as well. Referred pain is very common. Examining the hips in the face of knee pain will help prevent you from missing a serious hip condition. Delay in diagnosis is very common and is correlated with a more severe deformity and poorer outcomes.
  4. Hyperactive boys under the age of 10 who present with a limp (without pain or with vague complaints of hip, thigh or knee pain) should have an AP pelvis and frog-lateral of the hip to evaluate for Legg-Calve-Perthes disease. Far more common in boys than girls (4:1), this condition is most common between 4 and 10 years of age. The affected child is usually small and young appearing for his/her age. The child is able to bear weight, the pain or limp is usually worse with increased activity and there will not be any systemic signs or symptoms. Early diagnosis and treatment can make a significant difference in outcome. Once diagnosed, please refer to a pediatric orthopedist.
  5. Adolescents with hip pain and fever have septic arthritis of the hip until proven otherwise. Transient synovitis most commonly affects children 4-9 years old. Be very skeptical of this diagnosis in any child outside this age range. If the child is younger than four or older than ten years of age with hip pain and fever, think septic arthritis first. The child with transient synovitis may be able to ambulate and may tolerate gentle passive range of motion of the hip. He/she will commonly be afebrile. The CRP is usually <2 mg/dL, ESR usually <40 mm/hr, and WBC usually <12K cells/mL. A child with either transient synovitis or early septic arthritis will respond to ibuprofen. Ibuprofen should not be used as a diagnostic tool, but as a treatment for transient synovitis once the diagnosis is made. The differential diagnosis includes Lyme disease, gonorrhea, post-streptococcal reactive arthritis and hemophilia. Aspiration of the hip with cell count, gram stain, and cultures is the definitive diagnostic procedure for septic arthritis.

As I was taught and I often tell trainees, you don’t have to know what’s wrong, just recognize something is not right. Remembering these pearls will help you recognize when hip pain is really a problem.

Get to Know our SRH Staff: Molly McGuire, Research

Get to Know our SRH Staff: Molly McGuire, Research

by | Mar 26, 2019 | Spotlight

What is your role at the hospital? What do you do on a daily basis? 
My job involves working with teams of surgeon-researchers and coordinators all over the world to collect data about patients they treat for Perthes disease, a rare disease that impacts formation of the hip. We then study this information to understand the phenomenon of Perthes disease and help families. The organization is called the International Perthes Study Group. I help this multicenter research effort by coordinating legal, regulatory, communications and operational aspects of enrollment and data monitoring. I also recruit our own hospital patients for various Perthes-related research projects.  

What led you to Texas Scottish Rite Hospital for Children? How long have you worked here?
I was an academic research coordinator at UT Southwestern. Prior to that, I was in Lima, Peru working on grant-funded research for the University of Pennsylvania and Tulane University. I have been at the hospital for one year, and I’m loving it!  

What do you enjoy most about Texas Scottish Rite Hospital for Children?
My co-workers and colleagues energize and humble me and are the best part of the job.  

What was your first job? 
I was a lifeguard during a shift no one else wanted – 5-9 a.m.in the morning.  

What do you like to do in your spare time?
I spend as much time as I can in the company of my dog, and I play on a recreational women’s soccer team.  

Three words to best describe you:
Studious, committed and adventurous  

What would you do (for a career) if you weren’t doing this?
Professor or CIA, can’t decide.  

What’s the most adventurous thing you’ve ever done?
I served in the Peace Corps.

Learn more about the research conducted in the Center for Excellence in Hip. 

Speak Now for Kids: Physical Therapy Month with Emmitt

Speak Now for Kids: Physical Therapy Month with Emmitt

by | Oct 11, 2018 | Hip Disorders, Press Coverage

View the original story on the Speak Now for Kids website here.

October is National Physical Therapy Month, and we invite you to read about our amazing little patients who have benefited from physical therapy services at our children’s hospitals. Today’s blog is about Emmitt from Texas Scottish Rite Hospital for Children!

Three-year old Emmitt got off to a rocky start. While he was in the utero he was positioned head up ―or breach― instead of head down. As a result, his hips were unable to develop correctly, and he was born with hip dysplasia― an unstable joint dislocation where the upper leg bone does not sit properly in the hip socket.

In an effort to treat the dysplasia, Dr. Rathjen first placed Emmitt in a detachable brace, however the family was soon told that surgery was inevitable. In preparation for the procedure, Emmitt’s legs were wrapped and stretched. This photo was taken at one of the pre-op stretch sessions.

At seven-months-old, Emmitt had his surgery. All went well, but afterwards he spent almost three months in a body cast that extended from his chest to his ankles. “The cast made everything challenging,” says Emmitt’s mother Jennifer. “We had to make adjustments to the way he rode in his car seat, the way he sat down, the way he got his diaper changed, and the way he was held. We are thankful to the extended McMurry family who really came together and also to Dr. Rathjen and the wonderful staff at Scottish Rite Hospital that took care of Emmitt as if he were one of their own.”

When at last the cast was taken off, Emmitt learned to walk in almost no time and―like any little boy―was into everything. “I couldn’t be more grateful for my child being able to run, walk and play like any other healthy two-year-old child,” states Jennifer.