“His feet hit the mat, and almost instantly his knees buckled down, and he just let out the worst scream that you could ever have heard from a child.” That is the voice of Kati Hill, the mother of three-year-old Colton, describing the moment a trampoline park visit in the Dallas-Fort Worth metro shattered her family’s sense of safety. Colton’s femur—the strongest bone in the human body—snapped under the weight of an older child who was allowed to jump in the same zone. Kati’s warning has been shared hundreds of thousands of times across North Texas and beyond, because her realization was a universal one: “We had no idea.”
At Attorney911, and throughout the City of Keller, we meet families precisely at that moment of “no idea.” You were at a birthday party at the Altitude on Kroger Drive or the Urban Air off Southlake Boulevard. You signed the kiosk waiver because the line was long and the staff was encouraging the kids to hurry. Now, your child is in a trauma bay at Cook Children’s or Children’s Medical Center Dallas, and you are being told about Salter-Harris fractures, growth plate monitoring, and potential long-term surgeries.
We are here to tell you that what happened to your child in City of Keller was not an accident. It was the predictable output of a business model that prioritizes throughput and profit over the safety of Keller families. We are The Manginello Law Firm. With over 25 years of experience in catastrophic injury law, our Managing Partner Ralph Manginello and our associate attorney Lupe Peña represent the interests of those whose lives were altered in a second. We don’t just handle personal injury cases; we build corporate accountability cases against the conglomerates that own the trampoline park industry.
The Reality of Trampoline Parks in City of Keller
City of Keller is a premier family community, positioned in the high-growth corridor between North Fort Worth and Southlake. While this makes Keller an attractive market for brands like Sky Zone, Urban Air, and Altitude, it also means that our local families are on the front lines of an industry that is largely self-regulated.
Nationwide, trampolines send over 300,000 Americans to the emergency room every year. According to fresh 2024 epidemiology published in the journal Pediatrics by Teague et al., trampoline park injury rates are not declining in the way the industry suggests. Their data, tracking over 8.4 million jumper-hours, found that foam pit injuries occur at a rate of 1.91 per 1,000 jumpers, and high-performance jumping produces injuries at 2.11 per 1,000. In a busy Keller-area park that sees 500 jumpers on a Saturday afternoon, the statistics suggest an injury is almost inevitable.
Most families in City of Keller have been told the liability waiver they signed at the front desk is an absolute bar to recovery. They have been told that by participating, they “assumed the risk.” But in Texas, and particularly in our backyard, the law is more protective of children than the trampoline park wants you to believe. One of our attorneys, Lupe Peña, used to defend insurance companies and recreational businesses. He knows the secret language inside those Keller waivers because he used to write the arguments for the other side. Now, he uses that “insurance insider” playbook to dismantle their defenses.
If your child was injured on a trampoline in City of Keller, call 1-888-ATTY-911. We work on a contingency basis, meaning you pay nothing unless we win. We advance the costs of the biomechanical engineers and pediatric orthopedic consultants your case requires so that your family’s recovery fund stays intact.
Why a Trampoline Injury is Never an “Accident”
The trampoline park industry in the United States, including those operating near City of Keller, runs on a voluntary safety standard called ASTM F2970. This standard was not written by government scientists; it was drafted by the trampoline industry itself to create a safety floor.
When a park in City of Keller violates its own floor, it isn’t an accident. It is a decision.
- The Staffing Decision: ASTM F2970 requires specific monitor-to-jumper ratios. At peak hours in a Keller park, those ratios often collapse. When a 17-year-old court monitor is on his phone instead of watching the dodgeball court, that monitor didn’t just “miss” the collision. The park chose to understaff the shift to save on labor costs.
- The Maintenance Decision: A foam pit in a trampoline park is not just a pile of cubes. It is a safety system that must be rotated, refilled, and measured for depth. When a jumper bottoms out and strikes the concrete floor, as happened in the landmark $11.485 million Cosmic Jump verdict in Harris County, it is because the park chose to defer maintenance.
- The Design Decision: The industry has known for years that foam pits are dangerous. That is why many parks are switching to pressurized airbags. If your child’s Keller park still uses a foam pit that is compressed and shallow, the park has made a choice to keep an outdated, high-risk attraction in place.
We do not accept the “freak accident” defense. We look for the business decision that put your child’s health at risk. Whether the incident occurred on a backyard Jumpking or Skywalker or at a national chain like Sky Zone or Urban Air, we identify the exact standard that was ignored.
For more information on the immediate steps you should take, watch our video guide: “I’ve Had an Accident — What Should I Do First?” at https://www.youtube.com/watch?v=OCox4Lq7zBM.
The Physics of the Double-Bounce in City of Keller Parks
Many of the most severe injuries we see at parks near City of Keller involve the “double-bounce.” This occurs when a heavier jumper lands on a trampoline bed just as a lighter jumper is pushing off. The energy transfer from the heavier person—often a teenager or adult—to the lighter child can multiply the child’s launch force by up to four times.
Our biomechanical experts model these events to show that the child wasn’t just jumping; they were being thrown by a catapult. This is the mechanism behind some of the most catastrophic pediatric injuries, including:
- Femur Fractures: The thigh bone of a child is pliable but not indestructible. The double-bounce forces the bone to absorb more energy than it can handle.
- Salter-Harris Fractures: This is an injury to the growth plate that can permanently affect how a child’s bone develops. If the growth plate is destroyed at age nine, the child may face a decade of surgeries to correct limb-length discrepancies.
- SCIWORA: Spinal Cord Injury Without Radiographic Abnormality. This is a pediatric-specific horror where the child’s flexible spine torques, injuring the cord without a visible bone fracture. A child in City of Keller might be told they have a “sprained neck” at a local urgent care, only to wake up later unable to feel their legs.
The American Academy of Pediatrics (AAP) has been warning against recreational trampoline use since 1999. In their 2012 and 2019 reaffirmations, they were blunt: “Netting and padding do not eliminate the risk.” When a park in City of Keller allows a 200-pound adult onto the same bed as an 80-pound child, they are violating the core physics of safety.
If you’re dealing with the financial pressure of high-acuity medical care, call 1-888-ATTY-911. We understand the path from trauma bay to recovery, and we fight to ensure the responsible parties pay for every dollar of care your child will need over their lifetime.
The Truth About the “City of Keller” Waiver
The cornerstone of the trampoline park defense is the waiver you signed at the kiosk. In City of Keller and throughout Texas, these documents are framed as an absolute legal wall. The park’s insurance adjuster will tell you the case is closed because of that signature.
They are wrong.
Our team has decoded the Texas legal stack. To be enforceable in Texas, a waiver must satisfy the “fair notice” doctrine established in Dresser Industries v. Page Petroleum. This means the waiver must explicitly use the word “negligence” and the disclaimer must be conspicuous. A waiver buried in 20 screens of an iPad scroll often fails this test.
But more importantly for families in City of Keller, Texas courts follow the Munoz v. II Jaz Inc. doctrine. In Texas, a parent cannot sign away a minor child’s independent legal right to sue for personal injuries. While the parent’s own claims might be limited, the child’s claim survives.
Furthermore, the Cosmic Jump $11.485 million verdict in Houston serves as the ultimate Texas precedent: Gross negligence defeats a waiver. When a park has actual knowledge of a hazard and chooses conscious indifference, the waiver is nothing but noise.
With offices in Houston, Austin, and Beaumont, and a national reputation for taking on corporate giants like BP, Walmart, and Amazon, Attorney911 isn’t intimidated by a piece of paper on a kiosk. We look at the metadata, the formation of the contract, and the specific violations of ASTM F2970 that render the waiver unenforceable.
Learn more about dealing with these tactics in our video: “What to Do if Your Insurance Claim Is Denied” at https://www.youtube.com/watch?v=vsdXq0WOH8M.
Rhabdomyolysis: The Under-Recognized Keller Medical Emergency
A secondary, yet equally devastating injury mechanism occurs in the hot, humid indoor environments of Texas trampoline parks. We call it “Rhabdo.”
Exertional rhabdomyolysis is the breakdown of muscle tissue that releases a protein called myoglobin into the blood. This protein is toxic to the kidneys and can lead to acute kidney failure. In a City of Keller park on a July afternoon, a child who jumps for 90 minutes straight in a poorly ventilated space, drinks a sugary soda instead of water, and becomes overheated, is at extreme risk.
Symptoms often appear 12 to 48 hours after the visit:
- Urine the color of cola or iced tea.
- Muscle pain wildly out of proportion to the activity.
- Extreme fatigue or confusion.
We are currently litigating a $10 million lawsuit against the University of Houston involving rhabdomyolysis and acute kidney failure. We have built the medical expert network and the discovery protocols necessary to prove these complex cases. If your child’s Keller park visit was followed by a hospitalization for kidney issues, this isn’t just “bad luck.” It’s institutional accountability.
Piercing the Corporate Stack: Who Really Pays?
When your child is hurt at a park in City of Keller, you aren’t just suing the local LLC that owns the facility. That local operator is often undercapitalized by design. We go upstream to the deep pockets.
The trampoline park industry has been consolidated under private equity banners. Sky Zone, Inc. (formerly CircusTrix) is parented by Palladium Equity Partners. Urban Air is owned by Unleashed Brands, which was acquired by Seidler Equity Partners in 2023. These parent companies dictate the safety standards, the staffing budgets, and the insurance models for their franchisees.
Our discovery protocol identifies every insurance layer:
- The Operator’s primary General Liability policy ($1M-$5M).
- The Franchisee umbrella layers.
- The Franchisor’s additional-insured coverage and excess towers ($25M-$50M+).
- The Manufacturers’ product liability for defective nets, mats, or harnesses.
We’ve litigated against Fortune 500 corporations, including the fallout from the BP Texas City refinery explosion. The corporate defense firms hired by Sky Zone and Urban Air don’t intimidate us. We know how to find the money that Keller families need to cover lifetime care.
Catastrophic Pediatric Injuries: Measuring the Lifetime Cost
A catastrophic injury on a trampoline in City of Keller isn’t just an ER bill. It’s a lifetime trajectory change. At Attorney911, we build the “Pediatric Life-Care Plan” that most law firms ignore.
- Traumatic Brain Injury (TBI): According to the American Journal of Roentgenology (AJR 2024), 1.6% of pediatric trauma ED visits are trampoline-related. A developing brain is fragile. A concussion at age seven can lead to cognitive decline and academic regression that doesn’t fully manifest until high school.
- Spinal Cord Injury (SCI): The case of Damion Collins, who secured a $15.6 million arbitration award against Urban Air, serves as the benchmark for cervical injuries in this industry. For a child, the lifetime costs of quadriplegia can exceed $25 million in attendant care, home modifications, and specialized medicine.
- Infection Risks: Our unique infection vertical looks at what other firms miss—MRSA and staph infections acquired from unsanitized foam pits. A small cut from a spring-strike (E.6 mechanism) can lead to necrotizing fasciitis if the park’s sanitation protocol failed.
We represent families. We represent the parent who is spending their nights in a hospital chair in Fort Worth or Dallas. We represent the City of Keller resident who was told there’s no case because they “clicked yes.”
To understand how we calculate these values, see our video: “How Do Insurance Companies Calculate Pain and Suffering?” at https://www.youtube.com/watch?v=5EE9AWT12Kg.
What to Do in the Next 7 Days in City of Keller
If an injury happened this week, you are in a race against the park’s evidence-destruction schedule.
- Surveillance Preservation: Most Keller-area jump parks use DVR systems that overwrite footage in 7 to 30 days. We send a formal spoliation letter within 24 hours of retention to freeze that video.
- Kiosk Metadata: The version of the waiver your kid “signed” is stored in a database that may purge on a 72-hour cycle. We demand the audit logs immediately.
- Witness Canvass: The 17-year-old monitor who was on his phone on Saturday may not work there by next Saturday. We use private investigators to find ex-employees who have left the company and are willing to speak honestly about the park’s staff-training gap.
- Medical Chronology: We work with your providers at Keller-area clinics to ensure the medical chart matches the physics of the double-bounce or the foam-pit strike.
Don’t let the park manager “down-play” the injury as you leave the parking lot. This is a common industry tactic—delaying the 911 call and providing ice while the evidence clock ticks.
Call 1-888-ATTY-911 now. Hablamos Español. Lupe Peña speaks with you directly—no interpreters.
Frequently Asked Questions for City of Keller Parents
What if I signed the waiver for my child in City of Keller?
In Texas, a parent cannot bind a minor child to a pre-injury liability waiver under the Munoz v. II Jaz doctrine. Your child’s personal claim remains viable in Keller and throughout the state. Furthermore, if the park was grossly negligent—violating ASTM F2970 standards on staffing or equipment maintenance—the waiver is void even for adults.
How long do I have to sue a trampoline park in Texas?
The personal injury statute of limitations is two years from the date of the injury (Tex. Civ. Prac. & Rem. Code § 16.003). For minors, this is tolled until they turn 18, meaning they have until age 20. However, waiting years is an evidentiary mistake. Evidence in City of Keller parks vanishes in weeks. We file fast to preserve your child’s rights.
Should I let the park insurance company pay for our co-pays?
Be extremely careful. Often, these “goodwill” payments come with a release form disguised as a receipt. Signing that form could terminate your right to pursue a multi-million-dollar recovery for a Salter-Harris growth plate injury. Never take the “friendly adjuster” call without an attorney on your side.
My child fell from the climbing wall at Urban Air. Is the manufacturer liable?
Yes. In cases like Matthew Lu v. Altitude Gastonia, the climbing wall manufacturer (Ropes Courses, Inc.) was named as a defendant. Design failures, such as placing a 30-foot wall over unpadded concrete, create significant product liability exposure. We identify every designer and vendor in the Keller park’s supply chain.
Is the Keller park’s surveillance video really “unavailable”?
That is a tactic we call the “Surveillance unavailable defense.” When a park tells us the camera “didn’t see it,” we demand the DVR hard drive, the access logs, and an affidavit from their IT admin. In the Mathew Knight case in Georgia, a jury awarded $3.5 million because the park’s video glitched at the exact moment of injury across four cameras. We treat “unavailable” as evidence of a cover-up.
Who can I call for the $10M UH rhabdomyolysis case bridge?
Our managing partner Ralph Manginello and associate Lupe Peña are leading the litigation in the UH hazing case. This expertise in the myoglobin cascade and renal tubular damage is directly applicable to Keller-area trampoline rhabdo cases. We are the only firm in Texas with this specific medical-litigation architecture.
For more answers, see our video: “What Should You Not Say to an Insurance Adjuster?” at https://www.youtube.com/watch?v=9UKRbFprB0E.
Why Attorney911 is the Moat for Keller Families
Most personal injury firms in North Texas handle a trampoline case like a car wreck—they send a demand and accept the first policy-limits check. We don’t.
We built our practice around the “moat” of trampoline-industry expertise:
- Inside Knowledge: Lupe Peña wrote these waiver arguments when he worked for the insurers. He knows where the holes are.
- ASTM Mastery: We quote ASTM F2970 and the mandatory European standard EN ISO 23659:2022 from memory. We know their standards better than the on-site Keller managers do.
- Corporate Archeology: We follow the private equity money from City of Keller to the parent companies in Provo, Utah (Sky Zone HQ) or the boardrooms of Seidler Equity.
- Pediatric Specificity: We understand that a Salter-Harris fracture is a decade-long project, not a single medical bill.
As client Chad Harris said, “You are NOT a pest to them and you are NOT just some client… You are FAMILY to them.” We treat the families of City of Keller with that level of dedication.
Don’t let them push you around with a piece of paper signed at a terminal. The waiver is not a wall; it’s noise. We have recovered multi-million dollar settlements for traumatic brain injury and spinal cord injury victims—the same catastrophic categories you are facing.
Contact a City of Keller Trampoline Injury Attorney Today
What happened to your child in City of Keller wasn’t an accident. It was the output of a system that calculated a certain number of injuries as a cost of doing business. The American Academy of Pediatrics has been warning about these risks since 1999. The industry standard ASTM F2970 is the safety floor the park chose to operate beneath. The corporate parents—Sky Zone, Inc. and Unleashed Brands—have lawyers. So do we.
Your child’s case is decided by what gets preserved this week. The DVR overwrites in 7 to 30 days. The attendant on Kroger Drive or off Southlake Boulevard will transfer. The foam pit will be refilled.
Call 1-888-ATTY-911. Hablamos Español. Our associate attorney Lupe Peña speaks with you directly—no interpreters, no delays. We advance every expert cost. No fee unless we win.
Ralph Manginello and our team have 25+ years of experience making corporate defendants pay. We’ve fought BP, and we’ll fight for you. The case starts today.
1-888-ATTY-911
Attorney911.com
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