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Ulnar Collateral Ligament Injuries


Physical Therapy in Waterbury for Elbow



Welcome to Peak Physical Therapy's patient resource about Ulnar Collateral Ligament Injuries.

The ulnar collateral ligament (UCL) can become stretched, frayed or torn through the stress of repetitive throwing motions.

Professional pitchers have been the athletes treated most often for this problem. Javelin, football, racquet sports, ice hockey, and water polo players have also been reported to injure the UCL. A fall on an outstretched arm can also lead to UCL rupture (often with elbow dislocation).

This guide will help you understand:

  • how the problem develops
  • what causes this condition
  • how doctors diagnose the condition
  • what treatment options are available

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What parts of the elbow are affected?

The bones of the elbow are the humerus (the upper arm bone), the ulna (the larger bone of the forearm, on the opposite side of the thumb), and the radius (the smaller bone of the forearm on the same side as the thumb).


The elbow itself is essentially a hinge joint, meaning it bends and straightens like a hinge. But there is a second joint where the end of the radius (the radial head) meets the humerus. This joint is complicated because the radius has to rotate so that you can turn your hand palm up and palm down. At the same time, it has to slide against the end of the humerus as the elbow bends and straightens.

The joint is even more complex because the radius has to slide against the ulna as it rotates the wrist as well. As a result, the end of the radius at the elbow is shaped like a smooth knob with a cup at the end to fit on the end of the humerus. The edges are also smooth where it glides against the ulna.

There are several important ligaments in the elbow. Ligaments are soft tissue structures that connect bones to bones. The ligaments around a joint usually combine together to form a joint capsule. A joint capsule is a watertight sac that surrounds a joint and contains lubricating fluid called synovial fluid.

In the elbow, two of the most important ligaments are the ulnar collateral ligament (UCL) and the lateral collateral ligament. The UCL is also known as the medial collateral ligament. The ulnar collateral ligament is on the medial (the side of the elbow that\'s next to the body) side of the elbow, and the lateral collateral is on the outside. The ulnar collateral ligament is a thick band of ligamentous tissue that forms a triangular shape along the medial elbow. It has an anterior bundle, posterior bundle, and a thinner, transverse ligament.



Together these two ligaments, the ulnar (or medial) collateral and the lateral collateral, connect the humerus to the ulna and keep it tightly in place as it slides through the groove at the end of the humerus. These ligaments are the main source of stability for the elbow. They can be torn when there is an injury or dislocation of the elbow. If they do not heal correctly the elbow can be too loose or unstable. The ulnar collateral ligament can also be damaged by overuse and repetitive stress, such as the throwing motion.

Related Document: Peak Physical Therapy's Guide to Elbow Anatomy

Elbow Anatomy Introduction


What causes ulnar collateral ligament (UCL) injuries?

The ulnar collateral ligament can become stretched, frayed or torn through the stress of repetitive throwing motions. If the force on the soft tissues is greater than the tensile strength of the structure, then tiny tears of the ligament can develop. Months (and even years) of throwing hard causes a process of microtears, degeneration, and finally, rupture of the ligament. The dominant arm is affected most often. Eventually the weakened tendon my rupture completely causing a pop and immediate pain. The athlete may report the injury occurred during a single throw, but the reality is usually that the ligament simply finally became weakened to the point that it finally ruptured.



However, the general profile associated with this injury may be changing. Today, more and more children ages 10 to 18 are affected. Longer seasons with extended practice time and more tournaments increase the risk of UCL injury. Throwing volume, pitch type, and throwing mechanics can all contribute to the problem.

Children have their own unique risk factor in that they have an open growth plate in the elbow called the medial epicondylar physis. Force along the inside of the elbow during throwing is more likely to cause failure at the area of the growth plate than at the UCL. This injury is often termed Little League Elbow. Reconstruction of the UCL may not be needed in this age group unless the injury to the UCL occurs after the growth plate is closed. Sometimes the ligament avulses or pulls away, taking a piece of the growth plate with it. When the condition has been present for some time, the ligament is not all that may be damaged. The entire elbow joint is at risk due to the abnormal forces caused by the repetitive stress injury. 


Pain along the inside of the elbow is the main symptom of this condition. Throwing athletes report it occurs most often during the acceleration phase of throwing. If there are loose fragments or uneven joint surfaces, you may also notice popping, catching, or grinding.

Sometimes swelling can be seen along the inside of the elbow. If the ligament was ruptured, there may be bruising in the same area. Some patients have a slight loss of elbow motion. Closing the hand and clenching the fist reproduces the painful symptoms.


Diagnosis is based on your history and symptoms. When you first visit Peak Physical Therapy, we will complete an examination of the shoulder and elbow, performing specific tests to look for areas of tightness or laxity (looseness). Most patients will report tenderness along the inside of the elbow to palpation of the UCL ligament.

We will perform ligament stress tests at the elbow to test for joint stability. To do this our Physical Therapist generates force toward the inside of the elbow as the joint is moved from a position of slight flexion into full extension. Too much motion or opening of the joint at the medial joint line called gapping may be observed or felt by palpation. This test also allows us to see if there crepitation (popping, crunching) as the joint moves.

Some patients may be referred to a doctor for further diagnosis. Once your diagnostic examination is complete, the Physical Therapists at Peak Physical Therapy have treatment options that will help speed your recovery, so that you can more quickly return to your active lifestyle.

Peak Physical Therapy provides Physical Therapist services in Waterbury.

Our Treatment

What treatment options are available?
Non-surgical Treatment
Many athletes with elbow instability from UCL injury can be treated successfully with rehabilitation and without invasive procedures. When you begin your Physical Therapy at Peak Physical Therapy, we may initially recommend rest and/or activity modification (fewer pitches per game, per practice, per day). The athlete's posture, strength, and release of the ball must be analyzed and corrected. The use of curve balls should be avoided during the early phases of rehabilitation.
Anti-inflammatory drugs and analgesics may be recommended to reduce pain and inflammation. Icing may help, but must be used with caution. Too much cold can cause a worsening of the swelling as the body sends more blood to the area to warm things up. And cold can be an irritant to the already damaged (and irritated) nerve.
We may also use other modalities such as electrical stimulation and ultrasound with cortisone (called phonophoresis) when needed. Steroid injections are not usually recommended for this condition.
Your Physical Therapist will develop a daily program of stretching and strengthening; stretching exercises for the muscles of the forearm are usually included, as well as a strengthening program for the entire elbow/arm complex. We will employ high repetition, low weight exercise training to increase your endurance without placing additional stress across the joint.
We will also address any problems with flexibility, strength, and conditioning at your shoulder. Athletes will undergo plyometric strengthening of the entire arm, starting with the forearm muscles (flexors and pronators) and progressing to include the biceps, triceps, and rotator cuff of the upper arm. Plyometrics refers to training the nerves to fire quickly and the muscles to contract strong and fast. Plyometrics help develop explosive movements to improve muscular power and force. The goal is to increase the speed of the pitch (or throw for other throwing athletes).
Many athletes are able to return to play without further treatment. If conservative (nonoperative) care does not change the picture, then surgery may be needed.
Post-surgical Rehabilitation
When you begin your post-surgical rehabilitation program at Peak Physical Therapy the type of program prescribed will depend on the types of surgery that you underwent.
Arthroscopic Debridement
After arthroscopic debridement, we will start you on gentle range of motion exercises right away. Full motion can be restored as the pain and swelling resolve. Elbow strengthening exercises are begun within the first few days to week after the procedure. As your rehabilitation program progresses, a gradual throwing program will be included. Although the time required for recovery varies, full sports participation can usually be anticipated within one to three months.
Repair or Reconstruction
The postoperative program is the same for repairs or reconstruction. However, your arm will initially be immobilized in a bulky dressing.
Gentle handgrip and shoulder and wrist mobilization exercises are usually allowed right away after surgery. We often discontinue postoperative immobilization in seven to 10 days at which time active range of motion for the elbow is started. Your surgeon may want you to wear a special hinged brace to protect the elbow.
Your Physical Therapist will instruct you in the active range of motion exercises to be done daily. Strengthening exercises for the entire upper quadrant (shoulder, arm, wrist, and hand) are included in the post-operative program. Specific strengthening exercises to help the athlete prepare for his or her particular sport begin around four months post-op. Up until this time, any stress to the medial elbow is avoided.

Peak Physical Therapy provides services for Physical Therapy in Waterbury.

Physician Review

Standard X-rays are taken to look for bone spurs, loose fragments, or calcification in the ulnar collateral ligament. If the joint is gapping enough to sublux (partially dislocate), valgus stress radiographs may be taken.
Magnetic resonance imaging (MRI) with contrast dye is used to diagnose ligamentous rupture. The test doesn't always show a problem when there is one. This is called a false-negative result. Ultrasound and CT scans may be helpful. Some surgeons prefer to use arthroscopy to make the final diagnosis. The presence and severity of valgus gapping can be confirmed. Studies using these more advanced test methods to diagnose UCL injuries are being done. More data is needed before they become routine in the diagnosis of UCL injuries.


When the condition fails to respond to conservative care described above, surgery may be indicated. If pain is the primary symptom and there is no evidence that the elbow joint is grossly unstable, the surgeon may use an arthroscope (a tiny fiber-optic TV camera) to look inside the elbow and see the condition of the joint and the soft tissues. It may be possible to debride any tissue fragments or frayed edges. During debridement, the surgeon carefully cleans the area by removing any dead or damaged tissue. Any bone spurs or areas of calcium build-up are also removed.


If the ulnar collateral ligament has been injured acutely due to a fall on the outstretched arm, a direct repair of the ligament may be possible. If the ligament has pulled off the bone, it may be reattached with sutures through holes drilled in the bone. If the ligament is damaged by constant overuse and is not strong enough to restore stability to the elbow joint if it is simply re-attached or repaired, then the ligament must be replaced with a new ligament. This is termed a ligament reconstruction. During a reconstruction, the ulnar collateral ligament along the medial (inside) of the elbow is replaced with a tendon graft harvested from somewhere else in the body (autograft). One common technique used to replace the damaged ulnar collateral ligament is called the docking technique.


Portions of this document copyright MMG, LLC.

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