The throwing shoulder's trade-off
Throw hard for years and the shoulder remodels. The back of the joint capsule and the posterior rotator cuff stiffen from absorbing the deceleration of every throw, and the arm gradually loses internal rotation — the motion of reaching behind your back. Some of that shift is normal adaptation. When the loss grows large enough (typically 18–25° or more versus the other arm, with a shrinking total arc of motion), it becomes glenohumeral internal rotation deficit — GIRD — and it changes throwing mechanics in ways that load the shoulder and elbow.
Why it matters
GIRD is a flexibility problem, not structural damage — but left alone it is associated with shoulder and elbow trouble in overhead athletes: labral irritation, internal impingement, and increased stress on the inner elbow. The good news: it responds to a specific, boring, highly effective stretching program.
The fix: two stretches, done daily
The sleeper stretch (lying on the throwing side, rotating the forearm toward the table) and the cross-body stretch (pulling the arm across the chest) target the posterior capsule directly. Held 30 seconds, 3 repetitions each, twice daily — including before and after throwing sessions — most athletes recover measurable motion over 4–8 weeks. Physical therapy adds posterior cuff and scapular strengthening plus thoracic mobility work.
What about surgery?
Surgery is almost never the answer for isolated internal rotation deficit. Arthroscopic posterior capsular release is reserved for the rare athlete with a fixed contracture who fails a dedicated six-month program. The treatment is the program.
Related evidence: posterior-shoulder stretching improves internal rotation and symptoms in overhead athletes (JOSPT 2013; RCT 2026); GIRD is associated with upper-extremity injury in throwers (systematic review, Arch Phys Med Rehabil 2024).
Frequently asked questions
Is GIRD an injury?
Not exactly — it's an adaptation that has gone past the useful point. The tissue at the back of the shoulder has stiffened; there is usually nothing torn. That's why stretching works.
How much motion loss is a problem?
A deficit of roughly 18–25° of internal rotation versus the other arm — especially with a reduced total arc of motion — is where we see mechanics change and symptoms start.
How long until my motion comes back?
With a genuinely daily program, most throwers see measurable improvement in 4–8 weeks. We remeasure at follow-up rather than guessing.
Can I keep throwing while I fix it?
Often yes, at reduced volume, with stretches before and after every session — but a short throwing shut-down accelerates recovery in significant deficits. We'll set your plan at your visit.
See Dr. Pettit
5 locations across Cincinnati & Northern Kentucky · (513) 354-3700