In 2016, the NFHS did something that felt like obvious progress. It mandated that every state adopt a pitch count restriction policy for high school baseball, replacing the old innings-based limits with something that seemed more precise and more protective. Count the pitches, cap the number, require rest, and the injuries should fall. It was a good intention backed by real concern. The trouble, as a 2026 study in The Orthopaedic Journal of Sports Medicine makes uncomfortably clear, is that the injuries did not fall. The policy changed. The arms did not.

What the Study Found

Kriz and colleagues tracked 295 shoulder and elbow injuries across more than 1.5 million athlete-exposures in high school baseball from 2013 through 2019, using a national injury surveillance system in which athletic trainers reported both practice and competition injuries. The design was clean: compare the three seasons before the 2016 national mandate to the three seasons after, and see whether requiring states to adopt pitch count policies actually reduced throwing injuries. The hypothesis was the intuitive one, that injury rates would drop once the rules were in place.

They did not. The shoulder and elbow injury rate was 1.93 per 10,000 exposures before the mandate and 1.86 after, a difference that was statistically meaningless with a p value of .78. Three years of nationally mandated pitch count policies produced no detectable reduction in the very injuries they were designed to prevent. And then the study found something genuinely jarring. Practice injuries made up about 60% of the total, and practice elbow injuries were actually higher in seasons when policies were in effect, on the order of 135% higher, than in seasons without them. Read that twice. The injuries did not just fail to drop, the ones happening in practice, where most of them happen, moved in the wrong direction.

But buried in the same study is the part nobody is talking about, which is that two specific rules worked, and worked dramatically. Consecutive pitching day rest rules were associated with a 68% reduction in injuries, the single most protective component identified. A daily maximum of 105 pitches or fewer was associated with a 60% reduction. These are not modest effects. These are the kinds of numbers that should reshape policy overnight. And here is the gut punch: only 8 of 48 states, about 17%, fully adopted the USA Baseball guidelines, while most of the rest wrote their own rules with daily limits of 110 to 125 pitches and less rest. Having different rules for varsity versus subvarsity players was associated with a 54% reduction, and different rules for regular season versus postseason with a 57% reduction, both rare in practice. The protective ingredients exist. We just are not using them.

To be honest, this reminds me of installing a smoke detector and never putting batteries in it. The device is mounted on the ceiling, the box on the form is checked, and everyone feels safer right up until the kitchen catches fire. A policy that exists on paper but sets the limit too high and ignores the most dangerous moments is not protection. It is the appearance of protection, which may be worse, because it lets everyone stop worrying.

I do want to name the study's own boundary, because it matters enormously. This data captures only NFHS-sanctioned activity, the high school season itself, roughly three to four months out of the year. Every travel ball tournament, every showcase, every fall league inning is completely invisible here. So when we ask whether these policies work, we are asking it about a quarter of the throwing an athlete actually does.

Why This Information Is Important

The reason the mandate failed is not mysterious once you stack the surrounding evidence next to it. Start with the metric itself. A 2025 study in the Journal of Athletic Training found that pitch count, RPE, and even arm-specific RPE were not significantly associated with the actual musculoskeletal changes happening in pitchers' arms. The number we chose to regulate is a blunt proxy that does not track the physiological load very well, so capping it in games was always going to be a partial solution at best. We regulated the thing that is easy to count, not the thing that actually stresses the tissue.

Then there is the problem of what counts as throwing. A coach can swear he followed the rules because his pitcher stayed under the game limit, but a 2019 study by Melugin and colleagues should end the idea that the non-game throwing is harmless. When pitchers were asked to throw at a perceived 50% effort, they still generated 86% of their maximum elbow torque and 78% of their maximum velocity. Half effort, in the pitcher's mind, was nearly full load on the joint. So the 40-pitch bullpen two days before the start, the long catch-play that felt easy, the warm-up that nobody wrote down, all of it is loading the arm far more than anyone realizes, and none of it appears on a game pitch count. That is a direct mechanistic explanation for why practice injuries dominate and why a game-only policy cannot touch them.

And the unmeasured volume goes beyond the bullpen. A 2018 study by Hibberd and colleagues found that high school pitchers who also played catcher carried a 2.9 times higher risk of shoulder and elbow injury than those who played a different secondary position. Think about the pitcher who throws his allotted game pitches, then catches a bullpen, then takes 60 throws from behind the plate or across the infield in the next day's practice. The pitch count sheet says he is fine. His arm is keeping a different ledger. We built a system that watches one narrow window of throwing and pretends the rest does not exist.

The deeper issue is that the high school season is not where this story starts. A 2021 study by Croci and colleagues found that highly specialized athletes were over five times more likely to report a shoulder injury than less specialized peers, though to be fair the cleanest difference showed up between the high and moderate groups rather than high and low, so the relationship is real but not perfectly linear. The point still stands: year-round, single-sport throwing volume that begins in childhood is part of the engine driving these injuries, and it lives almost entirely outside any school policy. By the time a kid reaches a varsity mound, the damage may already be underway. A 2011 study by Hurd and colleagues drove this home in the starkest way possible, finding that in asymptomatic high school pitchers, 65% already showed UCL thickening and 43% had multiple abnormal MRI findings that resembled the elbows of adult professionals. These were kids with no pain and no diagnosis, and their ligaments were already adapting and breaking down. The injury did not appear on game day. It accumulated silently across years a three-month season study cannot see.

Finally, even the protocols we use to bring athletes back are shaky. A 2024 review by Boos and colleagues examined 99 publicly available throwing programs and found most offered no completion timeline, only 60% specified any criteria to begin throwing, and the progression parameters varied wildly from one program to the next. If the rules for returning to throw are that inconsistent and that thinly evidenced, it is no surprise that the rules for limiting throwing in the first place are too. This is a field where the policies and protocols have outrun the evidence underneath them, and the mandate is a symptom of that gap.

How Can This Information Be Applied

The first move is the easiest and the most ignored: adopt the rules that the data says actually work. Consecutive day rest requirements and a daily cap of 105 pitches or fewer were associated with reductions of 68% and 60% respectively, and yet most states allow more pitches and less rest. Separate limits for varsity and subvarsity, and for regular season and postseason, helped too. None of this requires new science. It requires states to stop writing weaker rules to stay competitive with their neighbors and start adopting the stricter ones we already know protect arms.

The second move is to count the throwing that actually causes injury. If 60% of injuries happen in practice and a perceived-easy bullpen is nearly maximal on the joint, then a game-only pitch count is monitoring the wrong thing. Bullpens, long toss, catch play, and innings caught from behind the plate all belong in the ledger. Treat practice throwing as real load, because the tissue does.

The third move is to widen the lens past the school season entirely. The single most useful predictor of a future injury is a previous one, and the volume that produces those early injuries is happening in travel ball, showcases, and fall leagues that no high school policy governs. A pitcher's arm does not reset between organizations. It carries the cumulative load across the whole calendar, and our monitoring has to follow it there or it is essentially blindfolded.

That is why the real answer is a compliance and data system that does not stop at the schoolhouse door. We need a way to capture the throwing volume of an athlete across every organization they play for, year round, and we need transparency about which tournaments and programs actually track that data and follow evidence-based rules. If a tournament is not a sanctioned follower of these guidelines or refuses to collect the data, parents and coaches deserve to know that walking in, so they can make an informed decision about the load they are signing their kid up for.

Conclusion

This study should change the conversation, and not in the direction most people will take it. The lesson is not that pitch count rules do not work, because two of them clearly do. The lesson is that we wrote a national rule, congratulated ourselves, set the limits too high, ignored the rest requirements that matter most, monitored only games while most injuries happened in practice, and stayed blind to the travel and showcase volume where the epidemic actually incubates. This stopped being a research problem a while ago. We have the evidence. Consecutive day rest works. A 105-pitch cap works. The failure is one of adherence and measurement, not knowledge. So let us stop checking the box and calling it safety, count every pitch a kid throws rather than only the ones in a sanctioned game, and build the system that follows the arm across the whole year instead of the sliver we happen to be watching. The smoke detector is on the ceiling. It is long past time we put the batteries in.

References

Kriz PK, Collins CL, Staffa SJ, et al. Do Pitching Restriction Policies Reduce Shoulder and Elbow Injuries in High School Baseball Players? The Orthopaedic Journal of Sports Medicine. 2026.

Pitch count, RPE, and musculoskeletal change in adolescent pitchers. The Journal of Athletic Training. 2025.

Melugin HP, Larson DR, Fleisig GS, et al. Baseball Pitchers' Perceived Effort Does Not Match Actual Measured Effort During a Structured Long-Toss Throwing Program. The American Journal of Sports Medicine. 2019.

Hibberd EE, Oyama S, Myers JB. Rate of Upper Extremity Injury in High School Baseball Pitchers Who Played Catcher as a Secondary Position. The Journal of Athletic Training. 2018.

Croci J, Nicknair J, Goetschius J. Early Sport Specialization Linked to Throwing Arm Function and Upper Extremity Injury History in College Baseball Players. Sports Health. 2021.

Hurd WJ, Eby S, Kaufman KR, et al. Magnetic Resonance Imaging of the Throwing Elbow in the Uninjured, High School-Aged Baseball Pitcher. The American Journal of Sports Medicine. 2011.

Boos AM, Sambare N, Smith MV, et al. Interval Throwing Programs for Baseball Players: Methodological Assessment of the Quality and Construct of Publicly Available Programs. Sports Health. 2024.