The Off-Season Mistake That Sets Up Spring Baseball Injuries

Oct 27

7 min read

Most spring baseball arm injuries aren't caused in April. They're set up between November and February.

Every winter I see the same pattern. The fall season ends, and a motivated 11-, 12-, or 13-year-old wants to get better. So the family does what seems logical: more throwing. Winter pitching lessons, an indoor league, a velocity program, maybe a showcase in January. By March the athlete has thrown almost year-round, and by May I'm evaluating a sore shoulder or a painful inside elbow.

In my last article, The Shoulder Wasn't the Problem, I explained how a young pitcher's recurring shoulder pain often traces back to the hips, trunk, and shoulder blade, not the shoulder joint itself. This article is the prevention side of that story: what the off-season should actually look like if you want a healthy, harder-throwing athlete in the spring.

The mistake: treating the off-season as more baseball

The biggest off-season mistake is never actually taking one. Research on youth pitchers is consistent on this point: total throwing volume over the year, and throwing while fatigued, are among the strongest predictors of arm injury.

In a study of 140 pitchers aged 14 to 20, researchers at the American Sports Medicine Institute (ASMI) compared pitchers who had needed elbow or shoulder surgery with pitchers who had never been injured. The injured pitchers were far more likely to have:

Regularly pitched with a tired arm (36 times the odds)
Pitched more than 8 months a year (about 5 times the odds)
Thrown more than 80 pitches per outing (nearly 4 times the odds)
Thrown faster than 85 mph (about 2.5 times the odds), which means the hardest throwers need the most protection, not the least

A second ASMI study followed 481 pitchers, aged 9 to 14 at the start, for 10 years. Those who pitched more than 100 innings in a calendar year were 3.5 times more likely to suffer an injury that required surgery or ended their playing career. Pitchers who also played catcher had 2.7 times the odds.

That research is why MLB and USA Baseball's Pitch Smart guidelines tell pitchers ages 9 to 14 to take at least four months off from throwing every year, with at least two to three of those months in a row. They also cap total innings at 80 a year for ages 9 to 12 and 100 a year for ages 13 and up. For most Western PA families whose season ends in the fall, that rest window lands from November through January.

Why young arms are different

A youth athlete's arm is not a small adult arm. Until the growth plates close, the weakest link in the throwing arm is usually the growth plate, not the ligament or tendon. That's why young throwers develop injuries adults don't:

Little League shoulder: stress injury to the growth plate at the top of the upper-arm bone
Little League elbow: stress at the growth center on the inside of the elbow
Osteochondritis dissecans (OCD) of the elbow: damage to the cartilage and bone on the outside of the elbow, which can become a long-term problem if missed

Growth plates need recovery time to adapt to throwing stress. Year-round throwing removes that recovery window. An arm that never gets an off-season is an arm that is always slightly behind.

What elite pitchers do, and why

If you worry that time off will cost your athlete ground, look at how the pros train. Eric Cressey, president of Cressey Sports Performance, trains more than 100 professional baseball players every off-season. His pro pitchers take a full 10 to 12 weeks off from throwing and don't start winter throwing programs until around Thanksgiving.

One of his athletes, Corey Kluber, didn't begin his off-season throwing program until December after the 2013 season. He won the American League Cy Young Award in 2014 and threw harder than the year before.

Cressey's reasons for the break apply even more to a growing athlete:

The rotator cuff and shoulder blade muscles are weaker at the end of a season. Rebuilding them takes months of focused strength work. Throwing on top of that work slows progress, the same way benching every day would stall a bench press.
The shoulder needs to regain stability. A season of throwing gradually increases how far the shoulder rotates back. Cressey has pitchers intentionally give back a few degrees each off-season so the muscles can stabilize the joint.
The most effective rotator cuff training causes soreness. That's fine when an athlete isn't throwing, and a problem when they are.

Cressey has been blunt about youth baseball in particular. He has pointed to max-effort off-season showcases and young bodies that aren't prepared for throwing programs, saying "Thirteen-year-olds should never be blowing out ligaments." He has even called for a recruiting dead period from October through December.

What actually protects the arm: the rest of the body

The arm is the last link in a chain that starts at the ground. A good throw transfers force from the legs, through the hips and trunk, into the shoulder blade, and finally out through the arm and hand. Biomechanics research estimates that the hips and trunk contribute about half of the energy and force in the entire throwing motion.

When a link earlier in that chain is weak, stiff, or poorly timed, the arm has to make up the difference. Sports medicine physician Dr. Ben Kibler calculated that a 20% drop in energy delivered from the hips and trunk requires a 34% increase in shoulder rotation speed to produce the same force at the hand. That extra demand lands on a growing shoulder and elbow.

In my evaluations of young throwers, these are the most common missing links:

Limited hip rotation, especially on the lead leg, which forces the trunk and arm to rotate early
Weak or poorly timed core and trunk control, so energy leaks before it reaches the arm
Poor shoulder blade (scapular) control, which changes how the shoulder joint is loaded
Lost shoulder rotation range, particularly internal rotation on the throwing side
Limited upper-back (thoracic) rotation, so the shoulder is asked to rotate more than it should
Lead-leg instability at foot strike, so the body doesn't stop and transfer force efficiently

None of these get fixed by throwing more. They get fixed by targeted mobility and strength work, which is exactly what the off-season is for.

What a smart baseball off-season looks like

A good off-season runs in four phases: rest, build, return to throwing, then preseason. Here is how that maps to a typical Western PA calendar for a player whose season ended in the fall.

Phase	Typical timing	Goal	What it includes
1. Rest and reset	November–December	Let the arm fully recover	No overhead throwing for 2–3 months. Play another sport. Get a movement and arm screen.
2. Build the engine	December–January	Fix the missing links	Strength training, hip and upper-back mobility, core and trunk control, shoulder blade work, sprinting, and medicine ball throws.
3. Return to throwing	Mid-January–February	Rebuild throwing tolerance gradually	A structured interval throwing program over 6–8 weeks: short distances first, distance before intensity, flat ground before the mound.
4. Preseason	February–March	Get game-ready safely	Gradual mound work, pitch counts, and continued strength work 1–2 days a week.

A few rules that matter more than any drill

Count the whole year, not just the season. Winter leagues, lessons, and showcases all count toward Pitch Smart's yearly innings limits.
One team at a time. Pitch Smart advises against playing for multiple teams at once, because separate coaches rarely track combined pitch counts.
Never throw through arm fatigue or pain. It's the single biggest controllable risk factor in the research.
Don't pitch and catch. Pitchers who also caught had 2.7 times the odds of serious injury in the 10-year ASMI study.
Be cautious with weighted-ball velocity programs. In a randomized study of 38 high school pitchers, a 6-week weighted-ball program raised velocity 3.3%. But 24% of those pitchers were injured during the program or the following season, while none were injured in the strength-training-only group. For a growing thrower, strength and movement quality are the safer path to velocity.
Multi-sport athletes give up nothing. A 2023 study of 115 high school pitchers found that single-sport specialists threw no harder and were no stronger or more mobile than multi-sport athletes. Basketball, wrestling, and other winter sports build athleticism while giving the throwing arm a real break.

When arm pain needs a doctor, not a trainer

Some arm soreness after a hard outing is normal and should fade within a day. Pain is different. Stop throwing and see a sports medicine physician if your athlete has any of the following:

Pain on the inside of the elbow while throwing or afterward
Pain on the outside of the elbow, or the elbow catching, locking, or swelling
Loss of elbow extension (they can't fully straighten the arm)
Pain at the top or outside of the shoulder that returns every time they throw
Numbness, tingling, or a "dead arm" feeling
A sudden drop in velocity or control with no clear reason
Pain that is still there the next day or after a few days of rest

In a growing athlete, these can signal a growth plate or cartilage injury. Many of these heal well when caught early, and some become long-term problems when they're played through. A good performance program works alongside your physician, not in place of one.

The bottom line for baseball parents

The athletes who throw hardest and stay healthiest in the spring usually aren't the ones who threw the most all winter. They're the ones who rested their arm, built a stronger engine underneath it, and returned to throwing gradually.

If your athlete has had recurring arm pain, or you want to make sure this winter builds them up instead of wearing them down, a preseason screen is the place to start. At Earn the Edge Performance, we evaluate the full throwing chain, from hip and trunk mobility to shoulder blade control and shoulder range of motion, and then build a plan that addresses what we find.

This is where sports medicine meets sports performance. Book a movement screen or reach us at earntheedgeperformance@gmail.com. We serve baseball families across the South Hills, Venetia, Peters Township, and greater Pittsburgh.