Brock’s Brigade – Fighting Perthes Step by Step

Brock’s Brigade – Fighting Perthes Step by Step

Cover story previously published in Rite Up, 2022 – Issue 3.

by Kristi Shewmaker
Kickball, wiffle ball, four square, taking hikes and riding bikes are a few of the activities 10-year old Brock, of Lee’s Summit, Missouri, enjoys. But, his first love is baseball.
 
“Baseball is his world,” his mother, Rachel, says. “He has played competitive baseball since he was 4.” In the spring of 2021, Brock played shortstop for a local team called the Baseknocks until midseason when he was diagnosed with Legg-Calvé-Perthes disease (Perthes), a rare childhood hip disorder, that temporarily took him out of the game and into a wheelchair.
 
Brock’s symptoms began with a pain in his groin. Then, he started to limp. “It was really bad,” Rachel says. “He couldn’t not limp.” She took Brock to visit his pediatrician who examined him but found nothing obvious like a broken bone. The doctor suggested trying physical therapy. “We thought maybe he had pulled a muscle,” Rachel says. After almost two months of physical therapy, Brock was still limping, and Rachel noticed that the thigh muscle in his right leg was two inches smaller than the thigh muscle in his left leg. “That was pretty alarming to me,” Rachel says. “I thought, ‘There’s something going on. It’s not just a pulled muscle.’” Later, an X-ray revealed that Brock had Perthes, a disease unknown to the family.
 
STEP 1: FINDING AN EXPERT

Perthes disease is a hip disorder that primarily affects the ball of the hip joint. The ball, or femoral head, is the upper part of the thighbone, or femur. The femoral head is normally round and fits inside the round socket of the pelvis. Perthes disease occurs when part or all of the femoral head loses blood supply. Without adequate blood flow, the femoral head bone dies. Over time, the body removes the dead bone and replaces it, initially, with softer bone. This bone is weaker, and the femoral head is more likely to collapse into a flattened position leading to deformity of the hip.
 
Perthes is rare, affecting approximately 15 children per 100,000 and is more common in boys than in girls, with a ratio of 5:1. The cause of Perthes is unknown, and currently, there is no cure. It typically occurs in children between 4 to 8 years old. Brock was diagnosed just before he turned 9.
 
“When you’re diagnosed with something that’s rare, and there’s not a ton of information, you feel like it’s a death sentence,” Rachel says. “I remember crying for the first three or four days because there were no answers, and no doctor could get us in. It was like a big, giant question mark.”
Rachel asked a friend, a physical therapist in nearby Kansas City, if she could recommend someone. Her friend said, “If it were my child, I would go see Dr. Kim at Scottish Rite.”
 
“Late at night, I sent a message to Scottish Rite and received a call the next day,” Rachel says. “Dr. Kim had an opening the day that we were going to be driving back through Dallas after a spring break trip to Galveston. It was clear that it was meant to be.”
 
STEP 2: GETTING EXEMPLARY CARE

A leading expert in Perthes disease, Harry Kim, M.D., M.S., is a pediatric orthopedic surgeon and director of the Center for Excellence in Hip at Scottish Rite for Children. Dr. Kim met with Brock and his family and confirmed the diagnosis.
 
“A perfusion MRI shows how much of the femoral head has blood flow,” Dr. Kim says. “Normally, it should be 100%. In Brock’s case, about 90% had no blood flow, which caused about 90% of his bone to die. His case was severe based on the amount of bone death and his age.”
 
Children ages 6 and younger tend to have better outcomes from Perthes disease because they have greater potential for developing new bone. Also, if half or more of the femoral head dies, the potential for regrowth without deformity is lower.
 
During the family’s initial visits, Dr. Kim and his team, including registered nurse Kristen Odom, explained the disease and Brock’s specific case and outlined the treatment options.
 
“When we came out of that first appointment, Brock said the best thing was that Dr. Kim looked at him, talked to him and asked him questions about how he was feeling, rather than just talking to me,” Rachel says. “It’s so important when you’re scared and uncertain, especially when you’re a kid, and the doctor makes you feel like you truly matter.”
 
After returning to Missouri, Rachel had more questions as the family processed the information. “Kristen spent an hour and 45 minutes on the phone with me,” Rachel says. “When I hung up, I told my husband we won’t ever go anywhere else. That kind of care simply doesn’t exist. When you’re dealing with a rare disease and your baby, that care is priceless.”
 
In May of 2021, Dr. Kim performed surgery on Brock’s right hip. “Brock presented with a mild collapse or deformity of the femoral head,” Dr. Kim says. “Without treatment, it would have degraded much further. We intervened before further collapse occurred.”
 
During the procedure, Dr. Kim cut the bone and positioned it so that he could tuck the femoral head securely into the hip socket. This containment procedure allowed the blood flow to come back naturally. He stabilized the bone with a metal implant that was removed in a later surgery. Over time, the body would remove the dead bone and generate new bone. To ensure healing, Dr. Kim prescribed a controlled weightbearing regimen, meaning Brock was unable to put any weight on his leg.
 
“He couldn’t play baseball, couldn’t run up the street to a friend’s house, couldn’t ride his bike,” Rachel says. “He went to school in a wheelchair, and kids stared at him and asked questions. We thought about ADA (Americans with Disabilities Act) accommodations everywhere we went. We had to rethink everything.”
 
STEP 3: FIGHTING FOR OTHERS

Despite all of these changes, Brock has taken it in stride. “He is my hero,” Rachel says. “Has he complained? Absolutely. Did he hate certain minutes, days and weeks? 100%. But overall, he was relieved to have an answer and a plan and no more pain. He has handled it better than I could have ever imagined.”
 
Last Christmas, Brock wanted to express his gratitude by designing and selling T-shirts as a fundraiser for Scottish Rite. “We called ourselves ‘Brock’s Brigade,’” Rachel says, “and put ‘His Fight Is My Fight’ on the front.” When the family traveled to Dallas for Brock’s second surgery in December, they presented a check for $1,000 to his care team. “Dr. Kim has really made an impression on Brock,” Rachel says. “This was Brock’s way of giving a little back so that hopefully it’s easier for kids in the future.”
 
“This family is so special,” Dr. Kim says. “They have gone through such difficulty, yet they want to help others improve their knowledge and support research. They are not just thinking about themselves but thinking about others.”
 
For more than a year, Brock completed a series of progressive exercises to restore muscle strength and range of motion. He went from using a wheelchair to bearing more and more weight on his crutches. In August, the answer the family had been holding their breath for finally came. Brock was given the all clear to walk.
 
“After we got the A-OK, Brock took his first walk with his dad and his brother,” Rachel says. “They do these “football walks” where his dad throws the football, and they go up ahead and catch it. They got to do that for the first time in a long time.”
 
Brock is especially excited for the day when he is cleared to play the sport he loves most. “Dr. Kim felt confident that Brock would be able to start winter practices and be 100% for spring baseball, which has been his goal from day one,” Rachel says. For now, Brock is easing back into his active life. He walks his dog, Pepper, and plays on the playground with his friends.
 
“The Scottish Rite team has been the biggest blessing to our family,” Rachel says. “Even being eight hours away and having to drive and fly multiple times throughout the last 18 months, I would drive four days to get to Scottish Rite. Our experience has been nothing short of amazing.”

Treating Perthes Disease

Treating Perthes Disease

Perthes disease, also known as Legg-Calvé-Perthes disease, is a childhood disorder of the hip. The disease affects the ball portion of the hip joint, known as the femoral head. Perthes is uncommon — approximately five to 10 children per 100,000 will be diagnosed each year — and it more commonly affects boys — 1 in 760 boys. Here are some interesting facts about this pediatric hip condition.

What Happens to the Hips in Perthes Disease
In a normal hip joint, the round femoral head of your femur fits perfectly into the round socket of the pelvis. Perthes disease interrupts the blood flow to the femoral head, causing all or part of it to die due to the lack of blood. The bone death is medically referred to as osteonecrosis.

Once the bone dies, the femoral head is more prone to breakage and heals poorly in older children. As a result, the pressure and weight on the bone from normal rigorous activities can cause the round portion to become flat over few months to a year after the diagnosis. For one to two years after bone death occurs, new bone gradually begins to fill in the areas where the body has removed the dead bone.

The Cause of Perthes Is Still Unknown
While we know what happens to the hip to alter the round shape of the femoral head, we still don’t know what causes the precipitating interruption of blood flow. We also know that Perthes is not heritable, since less than five percent of the patients have a family history of the disease. However, some other heritable hip conditions or blood disorder can mimic Perthes, such as inherited bone dysplasia like multiple epiphyseal dysplasia and sickle cell disease. History of taking corticosteroid for treatment of asthma, inflammatory conditions or cancer can also produce bone necrosis that mimics Perthes.

Diagnosing Perthes Disease
Because so many other diseases can mimic the symptoms of Perthes, it is known as a disease of exclusion. Doctors will rule out other conditions by taking a careful medical history and performing a physical exam. The physician will typically ask about the following diseases to rule them out:

  • Family history of hip disorders or early joint replacement
  • Steroid use, such as for asthma
  • Prior hip surgeries
  • History of sickle cell disease
  • History of hip infection
  • History of endocrine or clotting disorders

To confirm a potential Perthes diagnosis, doctors will perform X-rays of the hips. If an X-ray is taken too soon after symptoms have begun, it may appear normal. In that case, physicians can order a very sensitive diagnostic test called perfusion MRI if they still suspect Perthes.

Treatments and Complications
The body will naturally remove and replace the dead bone of the femoral head with new bone, so, to some extent, Perthes is self-healing. However, the healing process may be slow and even after healing has taken place, the femoral head may not return to its original round shape. When that fails to happen, patients may experience long-term complications, such as pain, stiffness and arthritis later in life.

Until the healing phase is complete, nonsurgical treatments might include crutches, wheelchairs, casting and/or bracing, and reduced physical activity. Surgical treatments might include pelvic or femoral osteotomy a process that re-orient the pelvis or femur. In older children, another treatment option is to make bone channels to speed up healing and to inject bone marrow stem cells.

While Perthes is in some ways self-healing, femoral heads sometimes don’t heal properly but there are other treatment options are available. With the interventions we have today and new treatment knowledge about the condition, those with Perthes can usually return to daily activities and sports activities without problems.

Learn more about the various hip conditions our experts treat.

Checking In – Perthes Disease

Checking In – Perthes Disease

Checking In – A Scottish Rite for Children Podcast, Episode 4
Perthes Disease

Host: Clinical Nurse Manager, Jennifer Bowden, R.N.
Expert Guests: Director of the Center for Excellence in Hip and pediatric orthopedic surgeon Harry Kim, M.D., M.S., and special guest Kristen Odom, R.N.

Listen to the full episode.
Below are the highlights from this episode:

What is Perthes disease?

Perthes disease is a pediatric hip disorder that usually affects children between the ages of 2 and 14.  The cause of this condition is currently unknown. Perthes disease leads to a loss of blood flow to the hip joint; however, experts do not know why that blood flow is disrupted.

What are some important terms that parents should always be aware of or understand when talking about this condition?
Perthes disease affects the hip. The hip joint includes a ball (femoral head) and socket (acetabulum). Perthes affects the ball part of the hip, causing a disruption and loss of blood supply, which initiates the disease. This leads to necrosis, or death of the bone. A common term used when talking about Perthes is osteonecrosis – osteo=bone and necrosis=death, meaning bone death.

What are the different stages of Perthes disease? 

There are four stages to the disease.

  • The first stage is when the blood flow gets disrupted, also known as necrosis – the stage of bone death.
  • The second stage is fragmentation which is when the body tries to heal the bone, but the ball (femoral head) is weakened, causing it to break down. Because the body is also trying to remove the dead bone, the head starts to collapse or flatten out, which causes it to lose its round shape.
  • The third stage is re-ossification which is when the body begins to remove the dead bone and start to build back the new bone.
    • Re-ossification: 
      • Re: is the starting back
      • -ossi: is the bone
      • -fication: is the new remaking of the bone
  • The fourth stage of Perthes disease occurs when the hip joint is all healed, also known as the healed stage.

What are the symptoms of Perthes disease? 

  • Persistent limping.
  • Pain in the hip, knee or thigh.
  • Stiffness in the hip and/or decrease in range of motion.

How is Perthes diagnosed? 

The diagnosis of Perthes requires determining that the cause of pain is not due to other issues or another condition. A thorough history is taken to make sure it is not something else, and then an examination is done to assess the hip as well as the knee to make sure it is the hip that’s the problem. The diagnosis of Perthes requires X-rays because it’s not just a clinical diagnosis. Diagnostic imaging is required.

For older children, patients over the age of 6, our team usually orders a specific MRI called a perfusion MRI. This test can assess how severe the disease is and provides more clarification on if operative treatment would be beneficial/necessary for the child.

What makes the perfusion MRI an important part of diagnosing Perthes disease?

The perfusion MRI involves injecting MRI contrast into the hip so that the blood flow can be analyzed to better understand where blood flow is lacking. More loss of blood flow means that the disease is more severe, and the healing process can take longer.

Why is it important to be seen by a pediatric orthopedic specialist for Perthes?

Perthes disease is a very uncommon condition that few doctors have experience in diagnosing and treating. It is important for parents to find a pediatric orthopedic specialist with a special interest in Perthes disease that cares for children with the condition regularly.

What can a parent and patient expect when they come to Scottish Rite to be seen for Perthes? 

The team at Scottish Rite provides a comprehensive assessment of the child – thorough history and physical exam, required imaging and reviewing any previous X-rays or testing that has been done previously.

The child’s emotional state is also assessed. They are asked to complete a PROMIS questionnaire which asks the child about anxiety, depressive symptoms and their peer relationship, as well as psychological aspects of the patient. Perthes is a chronic condition meaning the treatment can take months and, for some, years to overcome. Our team provides care for the whole child – mind, body and spirit.

What are the treatment options for Perthes disease?

All children are different, as is the severity of each child’s condition, so the treatment plan created for each child diagnosed with Perthes is also unique. Our team evaluates each patient – the stage of the disease they are in, range of motion and pain – then develops an individualized treatment plan.

Non-Operative Treatment

  • Weighted relief treatment – the child is given crutches, a walker or wheelchair to decrease the amount of weight placed on the hip.
  • Petrie casting – a treatment started back in the 1970s which involves putting both legs in the cast with a bar or two bars in between to spread the legs. This allows the hip to rest, especially for the children who are very active and unable to rest themselves.

Operative Treatment
Depending on the child and severity of their condition, surgery is an option to treat Perthes.

International Perthes Study Group
Scottish Rite for Children is the leading center for the International Perthes Study Group (IPSG). IPSG includes over 50 pediatric orthopedic surgeons and researchers from 10 different countries who are dedicated to improving the care of patients with Perthes disease.

The research from this group analyzes the very basic scientific level of the condition to better understand the disease and the key processes that are contributing to the femoral head collapsing and not healing properly. Through that research, the team is trying to develop new and innovative treatments to improve healing for children diagnosed with Perthes.

Learn more about the International Perthes Study Group.

Get to Know our SRH Staff: Molly McGuire, Research

Get to Know our SRH Staff: Molly McGuire, Research

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.