Medial Elbow Pain in a Junior-College Pitcher With a Partial UCL Tear
A 19-year-old right-handed junior-college pitcher throws 91–93 mph, starts once weekly with about 90 pitches, and throws a midweek bullpen. He has had six weeks of medial elbow pain, no pop, worst in late cocking and acceleration, never at rest, with loss of 3 mph. Examination shows focal tenderness over the proximal ulnar collateral ligament, a positive moving valgus stress test at 70–120°, and a positive milking maneuver; flexor-pronator bulk is normal, there is no ulnar nerve tenderness, and no valgus laxity is detectable. MRI shows an interstitial partial-thickness tear of the proximal anterior bundle without complete discontinuity, and a normal flexor-pronator mass with no osseous injury.
1. Does this MRI finding mandate ulnar collateral ligament reconstruction? Defend your answer using the examination and imaging.
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No. The decision hinges on valgus instability and the structural integrity of the flexor-pronator mass, not on an MRI signal alone. This pitcher has an interstitial partial-thickness tear of the proximal anterior bundle with no complete discontinuity, a normal flexor-pronator, no ulnar neuropathy, and no detectable laxity. Partial ulnar collateral ligament tears are common imaging findings in throwing athletes, including asymptomatic ones, and the remaining intact fibers often tolerate a structured return. The positive moving valgus stress test and milking maneuver localize the pain generator but do not by themselves establish instability. My plan is relative rest from throwing for 4–6 weeks, isometric and eccentric flexor-pronator loading, scapular and hip strengthening to reduce valgus load, and correction of his midweek bullpen volume, followed by a graduated interval throwing program. I would offer reconstruction for recurrent pain with documented increasing valgus laxity on stress radiographs, a complete or high-grade tear, or failure of three months of compliant nonoperative care, and I would tell him reconstruction costs 12–18 months and does not guarantee return to his current velocity.
2. Write the throwing progression and the workload changes you would institute, including the criteria for advancing at each stage.
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Weeks 0–4: no throwing; achieve pain-free range of motion plus rotator cuff and flexor-pronator isometrics. Weeks 4–6: light toss at 45 ft on flat ground every other day, about 25 throws. Then advance every 5–7 days only when he has no pain during or 24 hours after throwing, normal mechanics on video review, and full strength: 60 ft, then 90 ft, then 120 ft, then long toss, then bullpen at 50%, 75%, and 90%, then a simulated game. This is typically an 8–12 week program, so a realistic return is 3–4 months rather than 3 weeks. Workload changes: cap in-game pitches with appropriate rest given one start weekly, eliminate or convert the midweek high-intensity bullpen to roughly 15 pitches at 70%, enforce a 3–4 month off-season from overhead throwing, and track acute:chronic workload so weekly volume does not spike above about 1.3–1.5 times the four-week average. Full return requires pain-free 90% velocity in a simulated game and a normal valgus stress examination.