Causes of Bilateral Tennis Elbow
Bilateral tennis elbow (lateral epicondylosis) is primarily caused by repetitive occupational activities requiring repetitive wrist flexion and extension, rather than sports, and when bilateral, strongly suggests systemic occupational overuse rather than isolated mechanical trauma 1.
Primary Causative Factors
Occupational Overuse (Most Common)
The evidence clearly indicates that most cases of tennis elbow are caused by occupational stress rather than racket sports 2. When bilateral presentation occurs, this points even more strongly toward:
- Repetitive wrist extension activities - The dominant mechanism in lateral epicondylosis development 1
- Occupations requiring repetitive wrist flexion and extension - Carpentry, painting, computer work, manual labor 1, 2, 3
- Bilateral involvement suggests symmetric occupational exposure affecting both arms equally
Age-Related Degenerative Changes
Elbow tendinopathies are most common after 40 years of age and affect men and women equally 1. The bilateral presentation may reflect:
- Age-related tendon degeneration that is hastened by overuse 4
- Degenerative disease process rather than acute injury 4
- Increased susceptibility with aging makes bilateral involvement more likely with symmetric activities
Biomechanical Factors
Activities that require repetitive wrist extension contribute to development 1:
- Microtrauma at the extensor carpi radialis brevis (ECRB) origin 5
- Repeated large impact forces in occupational or sports activities 6
- Continued use of wrist extensors at 40-70% maximum voluntary contraction throughout activities 6
Important Clinical Considerations
Beyond Pure Mechanical Causality
Recent evidence suggests the possibility of spontaneous pain without purely mechanical background should be considered 7. In bilateral cases particularly:
- Neurovegetative factors play a crucial role in chronic myofascial disorders 7
- Central sensitization effects may contribute to bilateral presentation 7
- Segmental dysfunctions and myofascial chain dysfunctions should be evaluated 7
Common Pitfalls to Avoid
Don't assume sports causation - Despite the name "tennis elbow," racket sports account for a minority of cases 2
Bilateral presentation warrants occupational assessment - Look specifically for symmetric repetitive activities in the patient's work or daily routine
Age matters - Incidence and recurrence rates increase with age, and bilateral involvement in older patients (>40 years) suggests degenerative processes accelerated by overuse 1, 4
Consider systemic factors - Bilateral presentation may indicate central pain processing abnormalities rather than purely local pathology 7
Practical Clinical Approach
When evaluating bilateral tennis elbow, specifically identify:
- Occupational activities involving repetitive wrist extension/flexion
- Duration and intensity of repetitive activities
- Age-related risk (most common after age 40)
- Grip activities and hand-intensive work
- Bilateral symmetric exposure to causative activities
- Presence of myofascial dysfunction or vertebrogenic factors 7
The bilateral nature strongly suggests systemic occupational overuse as the primary etiology, particularly in patients over 40 years of age performing symmetric repetitive wrist activities in their occupation or daily life.