A 2024 study published in the International Journal of Environmental Research and Public Health tracked over 250 elementary school pitchers across one full year to answer a surprisingly simple question: can the way a kid squats tell us anything about whether they'll hurt their elbow? The researchers tested three different deep squat variations, hands overhead, hands on chest, and hands behind the back, and then followed these young athletes to see who developed medial elbow injuries. What they found was both striking and increasingly difficult to ignore. Players who failed the deep squat test were significantly more likely to develop medial elbow injuries, and the success rate on the squat was 22.6% lower in the injured group compared to those who stayed healthy. Of the three variations, the backward squat (hands behind back) was the most predictive of injury risk. Over the course of one year, 21.7% of these elementary-age pitchers developed medial elbow injuries. The backward squat, as the researchers noted, likely challenges multiple systems at once: ankle dorsiflexion, trunk control, neuromuscular coordination, and postural stability. When young pitchers can't coordinate these systems in a controlled squat pattern, the suspicion is that the same deficits show up during throwing, disrupting energy transfer from the ground up and leaving the elbow to absorb forces it was never designed to handle.

What the Study Found

The study design was straightforward but comprehensive. Researchers assessed 257 elementary school baseball players using three squat variations, each challenging the body in slightly different ways. The overhead squat required the athlete to hold their arms above their head while descending into a full squat. The chest squat had them cross their arms over their chest. The backward squat, which turned out to be the most revealing, required the athlete to place their hands behind their back. The test wasn't about strength or how much weight someone could move, it was about movement quality, coordination, and the ability to organize multiple joints and segments under a simple but demanding task. Players either passed or failed based on their ability to perform the squat without compensation, loss of balance, or positional breakdown. Then the researchers followed these athletes for one year, tracking who developed medial elbow pain or injury.

The results were clear. The injured group had a squat success rate of just 38.7%, compared to 61.3% in the non-injured group. That 22.6% gap wasn't a subtle trend, it was a significant marker. And while all three squat variations showed some relationship to injury risk, the backward squat stood out. Failing this test was the strongest predictor. Why? Because the backward squat removes the counterbalance that your arms normally provide. Without that assist, your body has to rely entirely on ankle mobility, hip control, trunk stability, and the coordinated firing of muscles throughout the entire posterior chain. If any of those systems are compromised, limited, or poorly coordinated, the squat falls apart. And if the squat falls apart, there's a decent chance the throwing motion isn't far behind.

To be honest, this reminds me of something we see all the time in youth athletes. A kid steps on the mound, and you watch their delivery, everything looks fine from the arm. But then you see how they load into their back leg, or how their hips move (or don't move), and suddenly it makes sense why their elbow hurts. The arm is just doing what the rest of the body is asking it to do. If the lower half can't create, transfer, or control force efficiently, the arm has to make up the difference. That's not a sustainable strategy, especially for a developing athlete whose tissues are still adapting to the demands of repetitive throwing.

Why This Information Is Important

This study matters because it challenges a deeply ingrained assumption in youth baseball: that elbow injuries are primarily about how much or how hard a kid throws. Pitch counts, velocity limits, rest days, all of these interventions are built on the idea that the elbow is the problem. But what if the elbow is just where the problem shows up? What if the real issue starts further down the chain, in the hips, the ankles, the trunk, the systems responsible for generating and transferring force efficiently? A 2025 study on lumbopelvic stability found that NCAA pitchers with greater trunk and pelvis instability during a single-leg step-down test were 2.9 times more likely to show higher elbow torque and lower velocity. The researchers used a simple functional movement screen, much like the squat test, and found that compensations visible in a controlled, non-throwing task were strong predictors of what happened during pitching. The pattern is consistent: when proximal stability breaks down, distal stress goes up.

Another 2025 study looked specifically at youth pitchers, ages 9 to 13, the same population studied in the squat screening research. Researchers measured drive-leg and stride-leg ground reaction forces and tracked how energy flowed from the lower body through the pelvis, trunk, and arm. They found that the drive leg primarily contributes to linear power transfer, while the stride leg creates the rotational forces that move energy from the trunk into the arm. The sequencing matters. The timing matters. And when young athletes lack the strength, coordination, or control to execute these movements efficiently, the kinetic chain breaks down. The arm doesn't stop throwing just because the hips aren't doing their job. It compensates. And compensation, over time, leads to overload.

We also know from research on adolescent pitchers that fatigue doesn't start in the arm, it starts in the lower body. A 2025 study on muscular fatigue in adolescent baseball pitchers found that after just 35 pitches, pelvic rotation velocity began to drop. Hip strength declined. Coordination between the hips and torso started to deteriorate. The elbow and shoulder didn't immediately fail, but they had to absorb more stress because the system that should have been generating and controlling force was no longer functioning optimally. Fatigue reveals what's weak. And if an athlete's movement quality is already compromised before fatigue sets in, the margin for error is dangerously thin.

There's also evidence that transverse-plane pelvic control, the ability to stabilize and regulate rotation through the pelvis, is one of the strongest determinants of pitching velocity. A 2025 study on pelvic control found that higher-velocity pitchers demonstrated superior dynamic coordination between the pelvis and trunk, particularly in the transverse plane. The backward squat, the most predictive variation in the elementary school study, directly challenges this quality. It requires the athlete to control rotation, maintain trunk position, and coordinate the pelvis and lower body without the stabilizing effect of the arms. If a young pitcher can't do that in a squat, it's worth asking whether they can do it consistently in a pitching delivery, especially under fatigue, across multiple innings, or during high-stress competitive situations.

How This Information Can Be Applied

The practical takeaway here is not that every young pitcher needs to be able to squat perfectly before they're allowed to throw. Movement quality exists on a spectrum, and the goal isn't perfection, it's awareness. If a young athlete fails a backward squat, that's not a diagnosis, it's a signal. It tells you something about where limitations might exist, whether that's ankle mobility, hip control, trunk stability, or some combination of all three. And once you know where the limitations are, you can start addressing them before they become problems.

For coaches and parents working with elementary and middle school pitchers, incorporating simple movement screens like the backward squat into a regular assessment routine makes sense. It doesn't require expensive equipment, advanced motion capture, or biomechanics expertise. It's a squat. You watch. You see what breaks down. And then you build a plan around what you see. If a kid can't maintain an upright trunk, that's a clue. If their heels come off the ground, that's a clue. If they lose balance or compensate by shifting their weight forward, that's a clue. These aren't pass/fail judgments, they're entry points into understanding how an athlete moves and what might need attention.

We also know from research on modifiable physical measures that qualities like shoulder strength, mobility, trunk control, and hip function can alter how much torque a pitcher experiences at the elbow for a given velocity. A 2025 study on elbow varus torque found that stronger, more mobile shoulders and better trunk control reduced the amount of stress placed on the ulnar collateral ligament. The implication is clear: you can influence injury risk by addressing physical qualities throughout the entire system, not just at the elbow. Lower body strength and coordination should be prioritized alongside arm care, particularly in young athletes who are still developing the neuromuscular patterns that will define their mechanics for years to come.

Training interventions don't need to be complicated. Single-leg balance drills under rotational load. Resisted trunk stability exercises. Isometric holds that challenge pelvic control. Ankle mobility work. Hip strengthening, both concentrically and eccentrically. These are all tools that can improve the qualities the backward squat challenges. And if improving those qualities reduces the likelihood that a 10-year-old pitcher develops medial elbow pain, that's worth the investment.

It's also worth acknowledging that movement quality and injury risk aren't perfectly correlated. Some kids will fail the squat and never hurt their elbow. Some will pass and still develop symptoms. Injury is multifactorial. Genetics, workload, recovery, tissue tolerance, mechanics, all of these variables interact in ways we don't fully understand. But the squat test offers something valuable: a window into how well a young athlete can coordinate their body under a simple, controlled demand. And if that window reveals deficits, addressing them early, before symptoms develop, seems like a reasonable and responsible approach.

Conclusion

This study doesn't claim that squatting ability determines elbow fate, and neither should we. But it does add to a growing body of evidence suggesting that arm injuries in young pitchers are often whole-body problems, not isolated joint failures. The backward squat challenges ankle mobility, trunk control, pelvic stability, and neuromuscular coordination, all qualities that play a role in efficient pitching mechanics. When those qualities are lacking, energy transfer breaks down. The lower body can't generate or control force effectively. The trunk can't stabilize or sequence rotation properly. And the elbow, sitting at the end of the kinetic chain, absorbs the slack. The elbow might be where the pain shows up, but it's rarely where the problem begins. Early movement screening, simple assessments like the backward squat, may offer coaches, parents, and practitioners a tool for identifying risk before it becomes injury. And for young athletes still building the physical and neuromuscular foundation that will carry them through their careers, that might be one of the most important interventions we can make.

References

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