Biceps Tendonitis: Inflammation of the Biceps Tendon from Overuse or Overhead Activity

Overview

Biceps tendonitis is a common overuse injury involving inflammation or degeneration of the long head of the biceps tendon (LHBT). This condition frequently causes pain at the front of the shoulder, especially in athletes who perform repetitive overhead activities. Though often overshadowed by more dramatic injuries like rotator cuff tears or labral lesions, biceps tendonitis can significantly impact performance, function, and long-term joint health if not addressed properly.

Anatomy and Function of the Biceps Tendon

The biceps brachii has two heads:

• Short head: Originates from the coracoid process of the scapula. 
• Long head: Originates from the supraglenoid tubercle and passes through the glenohumeral joint before traveling within the bicipital groove, stabilized by the transverse humeral ligament and surrounded by a synovial sheath. 

The LHBT plays a crucial role in:

• Shoulder flexion and abduction 
• Glenohumeral stabilization 
• Dynamic shoulder actions like throwing, lifting, and swimming 

Mechanism and Causes

Biceps tendonitis is typically an overuse injury caused by repetitive microtrauma that exceeds the tendon’s capacity to heal, leading to inflammation and sometimes degeneration (tendinosis).

Common Athletic Causes

1. Repetitive Overhead Activities: Pitching (baseball), serving (tennis, volleyball), swimming, and weightlifting. 
2. Shoulder Instability or Labral Tears: Especially SLAP lesions, which increase tension on the LHBT. 
3. Impingement Syndrome: Compression of the tendon under the acromion during overhead motion. 
4. Rotator Cuff Weakness or Injury: Causes compensatory overuse of the biceps tendon. 
5. Poor Technique or Equipment Use: Improper biomechanics during sports activities. 

Contributing Risk Factors

• Age-related tendon degeneration 
• Poor scapular control or posture 
• Inadequate warm-up or flexibility 
• Muscle imbalances 

Clinical Presentation

Typical symptoms include:

• Deep, aching pain in the anterior shoulder 
• Worsened pain during or after overhead activity 
• Tenderness over the bicipital groove 
• Popping or catching sensations during arm movement 
• Weakness in shoulder flexion or elbow supination 
• Night pain or discomfort when lying on the affected side 

Symptoms often develop gradually but can be aggravated by sudden increases in activity or acute trauma.

Impact on Sports Performance

Even mild biceps tendonitis can impair athletic ability, especially in sports that require upper body strength, precision, and endurance:

• Decreased throwing velocity and accuracy 
• Reduced serving power (e.g., tennis, volleyball) 
• Faster onset of fatigue (e.g., swimming, gymnastics) 
• Altered mechanics, increasing injury risk to other joints or limbs 
• Loss of confidence and hesitation in high-demand actions 

Diagnosis

Diagnosis is primarily clinical, based on history and physical exam:

Key Exam Findings

• Tenderness in the bicipital groove 
• Pain during resisted shoulder flexion or forearm supination 
• Positive Speed’s Test and Yergason’s Test 
• Intact passive range of motion, but pain at extremes 

Imaging

• Ultrasound: Identifies thickening, inflammation, or partial tearing 
• MRI: Useful for visualizing co-existing rotator cuff or labral injuries 
• X-rays: Rarely diagnostic but may rule out bony abnormalities 

Differential Diagnoses

• Rotator cuff tendinopathy or tear 
• Subacromial bursitis 
• SLAP or other labral tears 
• Glenohumeral arthritis 
• Pectoralis minor or long thoracic nerve entrapment 

Management

1. Acute Phase: Symptom Control

• Activity modification to avoid aggravating movements 
• Ice and NSAIDs 
• Short-term rest (rarely full immobilization) 
• Corticosteroid injections (cautiously used in athletes due to tendon weakening) 

2. Rehabilitation Phase

• Stretching and mobility exercises 
• Strengthening rotator cuff and scapular stabilizers 
• Postural and biomechanical correction 
• Neuromuscular retraining for overhead mechanics 
• Gradual return to sport-specific movements 

A structured rehab plan usually spans 4–8 weeks, with longer recovery for chronic or severe cases.

3. Addressing Underlying Issues

• Correct faulty throwing/lifting/swimming techniques 
• Adjust training volume or intensity 
• Treat associated shoulder pathologies (e.g., impingement, SLAP lesions) 

4. Surgical Intervention (If Needed)

Reserved for:

• Failure of conservative treatment (3–6 months) 
• Partial or complete tendon tears 
• Associated pathology requiring surgical correction 

Surgical options:

• Biceps tenodesis: Reattaching the tendon elsewhere 
• Tenotomy: Releasing the tendon (less common in young athletes) 
• Labral or rotator cuff repair, if indicated 

Return to sport post-surgery typically takes 3–6 months depending on procedure and sport.

Return-to-Play Criteria

• Full pain-free shoulder range of motion 
• Equal strength bilaterally 
• Completion of sport-specific drills at full intensity without symptoms 
• Correction of biomechanical deficits 

Prevention

To reduce the risk of biceps tendonitis in athletes:

• Warm-up thoroughly before practice or games 
• Maintain rotator cuff and scapular strength 
• Stretch posterior shoulder capsule regularly 
• Avoid sudden spikes in training load 
• Emphasize proper form and technique 

Conclusion

Biceps tendonitis is a manageable condition but one that can significantly affect athletic performance if ignored. With early recognition, targeted rehabilitation, and correction of underlying biomechanical issues, most athletes can achieve full recovery and return to their sport. Preventive strategies—including strength, mobility, and technique work—are key to reducing recurrence and optimizing shoulder function in overhead athletes.