Ulnar Collateral Ligament Sprain

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Ulnar Collateral Ligament Sprain

The elbow’s ulnar collateral ligament (UCL), also known as the medial collateral ligament, is essential for maintaining valgus stability and serves as the primary stabilizer of the elbow joint. Injuries of the ulnar collateral ligament are most commonly seen in athletes such as baseball pitchers, quarterbacks, cricketers, javelin throwers, and tennis, volleyball, and water polo players. This injury is also seen in wrestlers and others subjected to a sudden severe valgus force at the elbow. The injury may develop insidiously by a repetitious microtrauma or arise acutely with a single incident.

The ulnar collateral ligament originates from the posterior inferior aspect of the medial epicondyle of the humerus and inserts onto the sublime tubercle at the base of the coronoid process of the ulna. This anatomical positioning is crucial for providing medial stability to the elbow.

Elbow Stabilisers

The elbow joint is stabilized by a combination of dynamic and static stabilizers that work together to maintain joint integrity and allow for efficient, pain-free movement. Understanding these stabilizers is crucial in both clinical assessment and in designing rehabilitation programs following elbow injuries.

Ulnar Collateral Ligament Sprain Grading

Ulnar collateral ligament sprains of the elbow are graded according to the severity of the injury, reflecting the extent of ligament damage. This grading system is crucial for guiding treatment options and predicting recovery outcomes. The effective management of UCL sprains hinges on the injury’s grade, along with the individual’s activity level and functional demands. Prompt and accurate diagnosis, followed by appropriate treatment, is essential to prevent chronic instability and mitigate potential long-term complications.

Grade I (Mild)

• Slight damage to the ligament fibers, but the elbow remains stable under stress.
• Mild pain and tenderness at the medial elbow, with minimal swelling.
• No significant loss of function.

Grade II (Moderate)

• Partial tear of the ligament fibers, causing some elbow instability, particularly under stress.
• Moderate pain and tenderness at the medial elbow and observable swelling. The pain typically intensifies during activities that place stress on the ligament.
• A noticeable reduction in function (e.g., impacting an athlete’s ability to perform at full capacity).

Grade III (Severe)

• Complete tear of the ligament fibers, causing significant elbow instability.
• Severe pain occurs immediately after the injury, accompanied by significant swelling and a sensation of instability or the elbow “giving way.”
• Marked loss of function, making it difficult or impossible to perform load-bearing elbow movements (e.g., throwing or lifting actions).

Medial Elbow Pain Differential Diagnoses

• Ulnar collateral ligament sprain
• Medial elbow tendinopathy (Golfer’s Elbow)
• Little league elbow (in the skeletally immature patients)
• Wrist flexor muscle or pronator teres strain
• Myofascial pain syndrome (e.g., triceps brachii)
• Medial antebrachial cutaneous nerve injury
• Humeroulnar joint dysfunction
• Ulnar neuropathy (e.g., Cubital Tunnel Syndrome)
• Fracture or dislocation
• Tumors

• Medial elbow tenderness and swelling
• Loss of elbow range of motion may be present (depending on injury severity)
• Bruising may be present over the medial elbow in acute tears
• Clenching the fist may reproduce the pain
• Positive Valgus Stress and Moving Valgus Stress tests and positive Modified Milking Maneuver

• Magnetic Resonance Imaging (MRI) is the gold standard for evaluating UCL injuries. It provides detailed images of the soft tissues, including the ligaments, tendons, and muscles. It provides detailed images of ligaments and can reveal partial or complete tears, inflammation, and any associated injuries to surrounding structures.
• Ultrasound is a dynamic imaging modality that allows for real-time evaluation of the UCL and is less expensive and more accessible than MRI. Ultrasound can detect ligament tears and assess the integrity of the ligament while the joint is in motion.

A Guide to Potential Pathology in Patients with Elbow Pain

• Audible “Pop” at the Time of Injury – Acute tendon or ligament rupture or avulsion fracture
• Radiating Pain Extending into the Forearm or Hand – Peripheral Neuropathy
• “Electric-Like” Pain, Numbness, Tingling or Burning Sensations – Nerve involvement
• Locking, Catching, or Grinding Sensation – Articular pathology (e.g., osteochondritis dissecans, articular cartilage tear, or a loose body within the joint)
• Immediate Swelling After Injury – Bleeding into the joint or soft tissue
• Significant Weakness – Muscle or tendon rupture or nerve injury
• Instability – Ulnar collateral ligament (UCL) injury in mature athletes or avulsion fracture in skeletally immature athletes
• Young Athlete with Open Growth Plate – Consider apophysitis (Little League elbow)

Differential Diagnosis of Medial Elbow Pain

The differential diagnosis of medial elbow pain should include conditions such as:

• Medial epicondyle apophysitis
• Medial elbow tendinopathy
• Apophyseal avulsion fracture (as described below)
• Ulnar (medial) collateral ligament tear (as described below)
• Ulnar neuropathy (as described below)
• Flexor-pronator muscle injury
• Valgus extension overload syndrome (as described below)
• Myofascial pain syndrome (e.g., the pectoralis major and the triceps brachii muscles, as described below)
  
• Elbow joint dysfunction
• Cubital tunnel syndrome
• Inflammatory arthritis
• Cervical radiculopathy

Apophyseal Avulsion Fracture – Sudden onset or worsening of pain together with a ‘popping’ sensation suggests an avulsion fracture. Plain radiography should demonstrate widening with a displacement of the medial epicondyle apophysis.

Partial or Full Thickness Ulnar Collateral Ligament Tear – Ulnar collateral ligament tear presents with similar signs and symptoms to Medial Epicondyle Apophysitis. However, this condition typically occurs in individuals older than 15 years of age.

Ulnar Neuropathy – Ulnar Neuropathy may present with pain around the medial elbow where the ulnar nerve traverses the cubital tunnel. However, rather than pain, the most prominent clinical findings are numbness and muscular weakness due to ulnar nerve involvement. Nerve conduction studies may be required when Ulnar Neuropathy is suspected.

Flexor-Pronator Muscle Injury – Injuries of the flexor-pronator muscle group can present with muscle weakness and elbow pain that is aggravated by wrist flexion or forearm pronation. Depending on the severity of the injury, swelling and bruising may also be present.

Valgus Extension Overload Syndrome – Valgus Extension Overload Syndrome may manifest in athletes engaged in overhead throwing activities. It is characterized by discomfort in the posterior and medial aspects of the elbow. This condition is often accompanied by episodes of elbow locking and the presence of crepitus.

Medial Elbow Pain Caused by Myofascial Pain Syndrome

In patients presenting with medial elbow pain, a complete clinical examination should include an assessment for myofascial pain syndrome as the concomitant or primary cause of the patient’s pain. The main muscles to examine for myofascial trigger points are the triceps brachii (medial head) and pectoralis major. As illustrated below, when the pectoralis major muscle is involved, it produces chest and shoulder pain, as well as pain in the medial elbow.

The trigger points associated with myofascial pain syndrome may be located anywhere within a muscle and its fascia. Therefore, the entire muscle should be examined thoroughly. However, based on our clinical experience, the common locations for trigger points are presented in the images below.