By Peter G. Fitzgibbons, MD — Orthopedic Surgery, Maryland Orthopedic Specialists
As a hand and upper extremity surgeon who treats athletes at every level, I see the concern that comes with the words “Tommy John injury.” Whether you are a high school pitcher feeling new pain on the inside of your elbow, a weekend softball player, or a parent watching your child wind up on the mound, understanding this injury is the first step toward making the best decisions about your care.
The ulnar collateral ligament, commonly called the UCL, is a small but critical band of tissue on the inner side of the elbow. When it tears, the consequences for a throwing athlete can be significant. In this post I will walk you through what the UCL does, how injuries happen, how we diagnose them, and what modern treatment looks like — from conservative management all the way to surgical reconstruction and the newer repair techniques that are changing the conversation.
What Is the UCL, and Why Does It Matter?
The UCL is the primary restraint against the valgus (outward-bending) stress that the elbow experiences during the throwing motion [1,2]. During the late cocking and acceleration phases of a throw, the elbow can endure valgus torques of roughly 64 Newton-meters, with proximal forces exceeding 1,000 Newtons, and angular velocities across the joint of 1,900 to 2,480 degrees per second [2]. Over thousands of repetitions, this extraordinary stress can cause the ligament to stretch, fray, and eventually tear — either partially or completely.
The injury is named after Tommy John, the Los Angeles Dodgers pitcher who, in 1974, became the first professional athlete to undergo UCL reconstruction at the hands of Dr. Frank Jobe. Since then, the surgery has become one of the most recognized procedures in sports medicine [3].
Risk Factors
Several factors increase the likelihood of sustaining a UCL injury:
- High pitch volume and inadequate rest. Research has consistently identified fatigue and inadequate rest between outings as primary concerns among pitchers at every level [7,8].
- Year-round throwing. Pitchers from warmer climates who throw year-round undergo UCL reconstruction surgerysignificantly more often and earlier in their careers than those from colder climates who have a natural off-season [8].
- Increased velocity. Higher fastball velocity correlates with greater valgus stress on the elbow. Studies using pitch-tracking data show that declining fastball velocity and shifting pitch selection in the games before injury may be early warning signs [9].
- Pitching through pain. Many athletes try to push through medial elbow discomfort, which can transform a partial tear into a complete rupture.
- Previous childhood elbow injury. Surveys of professional and amateur pitchers have found that a childhood elbow injury significantly increases the odds of a UCL tear later in a player’s career [7].
- Youth specialization. Adolescent athletes who specialize exclusively in baseball and pitch competitively on multiple teams face a higher cumulative workload than their developing ligaments can safely absorb.
How Is a UCL Tear Diagnosed?
In my practice, diagnosis begins with a thorough history and physical examination. I listen carefully to when the pain started, whether there was a single acute episode or a gradual onset, and which activities make it worse.
On examination, I assess for tenderness along the inner elbow and perform the valgus stress test and the moving valgus stress test to check for instability. Frank instability — where the elbow openly gaps — is not always present, especially with partial tears.
The imaging modalities with the greatest diagnostic accuracy are magnetic resonance imaging (MRI), MRI-arthrogram, and stress ultrasonography [2,4]. MRI is the imaging modality of choice and can reveal the location of the tear (proximal, distal, or mid-substance) and whether the tear is partial or complete. These details are important because they guide treatment decisions. Stress ultrasound can be a valuable complementary tool, with a side-to-side difference in joint space opening of about 1 millimeter under valgus stress suggesting significant ligament compromise [4].
Treatment Options
One of the most important things I tell patients is that not every UCL tear requires surgery.
Conservative (Nonoperative) Treatment
For partial tears, especially in athletes who are not high-level competitive throwers, we often begin with a structured nonoperative program. This typically includes:
- A period of rest from throwing, usually four to six weeks
- Anti-inflammatory medication and ice
- Progressive physical therapy focused on forearm, wrist, and shoulder strengthening
- A gradual return-to-throwing program guided by symptoms
Return-to-play success rates with conservative treatment range from 42 to 100 percent depending on the severity and location of the tear and the demands of th
e athlete’s sport [2]. Platelet-rich plasma (PRP) injections are also being explored as an adjunct to rehabilitation, though more research is needed to establish their role.
Surgical Reconstruction (Tommy John Surgery)
When conservative treatment fails or the tear is complete, UCL reconstruction remains the gold standard. In the most widely studied technique, a tendon graft — often the palmaris longus from the patient’s own wrist or a hamstring tendon — is threaded through bone tunnels in the humerus and ulna to replace the damaged ligament.
The outcomes of modern UCL reconstruction are encouraging. A landmark study of 1,281 athletes demonstrated excellent return-to-play rates with the modified technique [3]. A comprehensive systematic review found that Major League Baseball pitch
ers returned to play in 80 to 97 percent of cases in approximately 12 months, though returning to the same level of performance took longer, with 67 to 87 percent achieving that milestone at around 15 months [5]. Revision UCLR carries somewhat lower return rates, ranging from 55 to 78 percent returning to their previous level [5].
It is worth noting that while athletes generally return to comparable performance levels, pitching workloads and fastball usage tend to decrease after reconstruction [5].
UCL Repair With Internal Brace — A Newer Option
In select patients — typically those with a clean, acute avulsion-type tear at the proximal or distal attachment rather than chronic attrition — UCL repair with an internal brace has emerged as a promising alternative. This technique repairs the athlete’s own ligament and reinforces it with a synthetic suture tape.
A study of 56 athletes treated with this approach showed that 91 percent returned to play at an average of just 7.8 months, significantly faster than the 12-to-15-month timeline typical after reconstruction [6]. The appeal is clear: faster recovery, no graft harvest, and preservation of the native anatomy. However, careful patient selection is critical, and longer-term data are still being gathered.
Prevention
In my view, the most powerful tool we have against UCL injuries is pr
evention. Here is what I recommend:
- Respect pitch counts and rest days. Follow the guidelines published by organizations such as USA Baseball and theAmerican Sports Medicine Institute.
- Avoid year-round competitive pitching. An annual off-season of at least two to three months away from overhead throwing gives the ligament time to recover [7].
- Strengthen the entire kinetic chain. A strong core, legs, and shoulder complex reduces the load transmitted to the elbow.
- Listen to your body. Declining velocity, loss of command, and medial elbow soreness are warning signs that should not be ignored [9].
- Warm up properly and progress throwing gradually, especially at the start of the season.
When to See a Specialist
When to See a SpecialistIf you experience persistent pain on the inside of your elbow during or after throwing, a noticeable drop in velocity or accuracy, numbness or tingling in the ring and small fingers, or a sudden “pop” during a throw followed by immediate pain — it is time to see an orthopedic specialist. Early evaluation allows us to distinguish a partial tear that may respond well to conservative care from a more significant injury that requires surgical planning.
At Maryland Orthopedic Specialists, our team has deep experience evaluating and treating UCL injuries in baseball players of all ages and skill levels. Whether the answer is rest and rehabilitation or a surgical procedure, we will work with you to create a personalized treatment plan that gets you back to the activities you love.
If you or your athlete is dealing with elbow pain, I encourage you to schedule a consultation at Maryland Orthopedic Specialists, (301) 515-0900, mdorthospecialists.com.
Disclaimer
This blog post is intended for patient education purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional regarding your individual condition and treatment options.
References
1. Gehrman MD, Grandizio LC. Elbow Ulnar Collateral Ligament Injuries in Throwing Athletes: Diagnosis and Management. J Hand Surg Am. 2022;47(3):252-261. DOI: 10.1016/j.jhsa.2021.11.026. https://linkinghub.elsevier.com/retrieve/pii/S0363502321007929
2. Zaremski JL. Elbow Ulnar Collateral Ligament Injuries in Overhead Athletes: An Infographic Summary. Athl Train Sports Health Care.2022;14(3):99-100. DOI: 10.1177/19417381221098622. https://journals.sagepub.com/doi/10.1177/19417381221098622
3. Cain EL, Andrews JR, Dugas JR, et al. Outcome of Ulnar Collateral Ligament Reconstruction of the Elbow in 1281 Athletes.Am J Sports Med. 2010;38(12):2426-2434. DOI: 10.1177/0363546510378100. https://journals.sagepub.com/doi/10.1177/0363546510378100
4. Park J, Kim H, Lee JH, et al. Valgus stress ultrasound for medial ulnar collateral ligament injuries in athletes: is ultrasound alone enough for diagnosis? J Shoulder Elbow Surg. 2020;29(3):e97-e104. DOI: 10.1016/j.jse.2019.12.005. https://linkinghub.elsevier.com/retrieve/pii/S1058274619308353
5. Thomas SJ, Paul RW, Rosen AB, et al. Return-to-Play and Competitive Outcomes After Ulnar Collateral Ligament Reconstruction Among Baseball Players: A Systematic Review. Orthop J Sports Med. 2020;8(12):2325967120966310. DOI: 10.1177/2325967120966310. https://journals.sagepub.com/doi/10.1177/2325967120966310
6. Arciero E, Confino JE, El-Najjar D, et al. Functional Outcomes of Primary Ulnar Collateral Ligament Repair with Internal Bracing in Athletes. Orthop J Sports Med. 2023;11(7 Suppl 3). DOI: 10.1177/2325967123S00047. https://journals.sagepub.com/doi/10.1177/2325967123S00047
7. Camp CL, Melugin HP, Leafblad ND, Conte SA. Injury Prevention in Baseball: from Youth to the Pros. Curr Rev Musculoskelet Med. 2018;11(1):26-34. DOI: 10.1007/s12178-018-9456-5. https://pmc.ncbi.nlm.nih.gov/articles/PMC5825337/
8. Pescatore SM, DeShazo SJ, Weiss WM. Frequency of Tommy John Surgery in NCAA Division I College Pitchers Versus Weather Conditions. Orthop J Sports Med. 2025;13(1). DOI: 10.1177/23259671241311601. https://journals.sagepub.com/doi/10.1177/23259671241311601
9. Mayo BC, Miller A, Patetta M, et al. Preventing Tommy John Surgery: The Identification of Trends in Pitch Selection, Velocity, and Spin Rate Before Ulnar Collateral Ligament Reconstruction in Major League Baseball Pitchers. Orthop J Sports Med. 2021;9(6):23259671211012364. DOI: 10.1177/23259671211012364. https://journals.sagepub.com/doi/10.1177/23259671211012364
