Ulnar Collateral Ligament Reconstruction
Dr Larry W. McDaniel, Jason Kramp, and Nick Kruse discuss the processes related to Ulnar Collateral Ligament Surgery and Rehabilitation.
Ulnar collateral ligament reconstruction (UCL) is a surgical procedure in which a ligament in the medial elbow is replaced with a tendon from somewhere else in the body. Often the tendon is taken from the forearm, hamstring, knee, or foot of the patient. This procedure is standard among collegiate and professional athletes in several sports, most notably sports that require overhand throwing or striking movements. The surgery is named after Tommy John, a pitcher for the Los Angeles Dodgers who was the first professional athlete to undergo the operation in 1974 successfully. The procedure was performed by Dr Frank Jobe. After the tendon from the forearm of the opposite elbow or below the knee is harvested it is then woven in a figure-eight pattern through tunnels that have been drilled in the ulna and humerus that are part of the elbow joint. However, there is a risk of damage to the ulnar nerve when performing this surgery (Purcell et al. 2007)
The probability of a complete recovery after surgery is presently estimated at 85% to 90%. At the time of Tommy John's operation, Jobe put his chances at 1 in 100. After his surgery in 1974, John spent 18 months rehabilitating his arm, returned for the 1976 season, and went on to pitch in baseballs' major leagues until 1989 at age 46. Today, the procedure takes about an hour, and full rehabilitation takes approximately 6-12 months. Athletes who have the surgery may regain their full range of motion after nearly two months and at that time start performing weight exercises. For the next four months, athletes are allowed to increase the resistance and begin performing exercises that emphasize placing stress on all parts of the arm.
The ulnar collateral ligament may become stretched, frayed, or torn through the repetitive stress of the overhand throwing motion. The risk of injury to the athlete's UCL in the elbow is thought to be extremely high as the amount of stress through this structure approaches its ultimate tensile strength during every hard throw (Fleisig 1994).
While many authorities suggest that an individual's style of throwing or the types of throwing motions they use may be the most crucial determinant of the likelihood to sustain an injury. The results of a 2002 study suggest that the total number of throws is the most significant determinant (Lyman et al. 2002). There was a weak correlation between throwing mechanics perceived as bad and injury. Although there is a large body of evidence that suggests mistakes in throwing mechanics increase the likelihood of injury (Whiteley 2007) it seems that the higher risk lays in the total volume of throws. Research into the area of throwing injuries in young athletes has led to age-based recommendations for throwing limits for young athletes (Lyman et al. 2001).
In younger athletes for whom the growth plate (the medial epicondylar epiphysis) is still present, the "opening up" force at the inside of the elbow during overhand throwing is more likely to fail at this region than at the Ulnar Collateral Ligament. This injury is often termed "Little League Elbow," and does not require reconstructing the Ulnar Collateral Ligament.
Frequency and Misconceptions
Today, UCL surgery is becoming more common in youth from the ages of 10-18 due to the increased length of seasons and the increased competition at an early age. In some cases, athletes throw harder after the procedure than they did previously.
As a result, orthopaedic surgeons are reporting that increasing numbers of parents are coming to them and asking the surgeons to perform the procedure on their un-injured sons in the hope that this will improve their performance. However, many people, including Dr Frank Jobe, the doctor who invented the procedure, believe any supposed post-surgical increase in performance is generally due to two factors. The first is the athletes' increased attention to conditioning. The second is that in many cases it may take several years for the UCL to degrade. Over these years, the athlete's velocity will gradually decrease. As a result, the procedure likely allows the athlete to throw at the previous velocity before the start of the UCL to degrade. (Keri 2007)
The length of time required for UCL rehabilitation often involves a year to eighteen months. This is a long process for those athletes who desire to get back to participating at the same level as before the surgery. Rehabilitation involves a variety of exercises and modalities to assist the new ligament in the process of regaining the level of strength that it had before the surgeries.
The rehab for "UCL" or Tommy John Surgery is a very intensive and frustrating process as mentioned in the USA Today article, titled "Pitchers find patience hardest part of Tommy John surgery." 
Below is a sample rehab schedule for UCL surgery:
The rehabilitation process, with the 12-18 months of recovery, is the protocol required if athletes plan to return to participating and performing at their prior level. Athletes must utilize self-discipline while participating in the rehabilitation program and know when the time is right to increase the intensity of the therapy.
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About the Authors
Dr Larry McDaniel is an associate professor and advisor for the Exercise Science program at Dakota State University, Madison SD USA. He is a former All-American in football and Hall of Fame athlete & coach.
Jason Kramp is a student enrolled in Exercise Science at Dakota State University and an outstanding baseball pitcher.
Nick Kruse is a student enrolled in Exercise Science at Dakota State and a veteran of the Iraq Conflict.