Tennis Elbow: Re-evaluating Lateral Epicondylar Pain as a Postural Annular Ligament Strain

 

1. Introduction & Epidemiology

Lateral epicondylar pain of elbow, traditionally labelled as "tennis elbow" or lateral epicondylitis, is a highly prevalent condition affecting the elbow joint. Clinical data indicates the condition is most common in middle-aged adults of both sexes. Despite its common name, it frequently presents in sedentary workers and individuals who do not participate in racquet sports, making the term "tennis elbow" a clinical misnomer.

The condition affects a highly diverse demographic, presenting equally in males and females, and across varied occupational demands—from individuals engaged in sedentary office desk work and domestic activities to those performing heavy manual labour.

2. Clinical Presentation & Traditional Aetiology

The standard clinical presentation involves persistent pain and a burning sensation localized over the lateral epicondyle. This pain frequently radiates down the forearm and wrist, resulting in a significantly weakened grip strength. In advanced presentations, functional impairment is severe; basic mechanical actions involving forearm rotation and gripping—such as turning a doorknob or lifting minor objects—become intolerable for the patient. Symptoms are notably chronic, frequently persisting for weeks, months, up to 10 to 12 months or more. Traditional orthopedic literature attributes this pathology to repetitive microtrauma and straining of the common extensor tendon originating from the lateral epicondyle, alongside localized ligamentous strain due to muscular overuse.

3. Diagnostic Criteria

Diagnosis is primarily clinical, established through comprehensive medical history and physical assessment. Pathognomonic signs include:

• Localized pain and exquisite tenderness directly over the lateral epicondyle.

• Completely preserved, pain-free passive range of motion of the elbow joint.

• Subjective exacerbation of pain and weakness during active, resisted functional use of the hand and wrist.

Advanced diagnostic imaging, such as musculoskeletal ultrasound or radiography, is rarely indicated and are reserved primarily to rule out rare differential diagnoses or co-existing intra-articular pathologies.

4. The Postural Pathomechanics: A New Aetiological Model

While standard conservative management—encompassing physical therapy, targeted eccentric exercises, systemic analgesics, and localized corticosteroid injections—is widely utilized, these interventions frequently yield inconsistent or non-definitive long-term outcomes.

A detailed review of patient history reveals a critical, overlooked chronological pattern: patients consistently report sound, rarely interrupted sleep during movement of the limb, yet experience severe, immediate pain and restricted functional mobility upon waking. Focused questioning reveals a highly prevalent behaviour pattern: these patients often sleep in lateral decubitus on the affected side, inadvertently using their ipsilateral forearm as a pillow under their head. These patients rarely connect this sleep posture to their daytime symptoms, some of them even deny use of this sleep posture, although accompanying relatives or cohabitants consistently confirm this positioning.

The pathomechanics of this posture can be explained through clear anatomical relationships:

1. The weight of the cranium resting continuously over the distal third of the forearm stabilizes the distal radioulnar (RU) joint in a position of semi-pronation.

2. This sustained gravitational load forces the radial head to adjust its articulation within the radial notch of the ulna and against the capitulum of the humerus. This mechanical adjustment places continuous severe microvascular and mechanical strain on the surrounding stabilizing ligaments and musculature.

3.This model is further supported during physical examination: deep palpation frequently elicits localized tenderness over the anterior or posterior bony attachments of the annular ligament when the forearm is placed in extreme supination or pronation. Consequently, a more anatomically precise diagnostic term for this condition is "Strained annular ligament of the radial head."

5. Therapeutic Intervention Plan

Given the primary postural aetiology, successful resolution relies heavily on mechanical behaviour modification rather than purely pharmacological or modalities-based therapy. The clinical efficacy of eliminating this posture serves as diagnostic confirmation of the underlying cause.

Behavioral Modification (Primary)

Strict instruction to immediately cease utilizing the forearm as a pillow during sleep or rest.

Nocturnal Mechanical Restraint

For patients unable to consciously break the habit during deep sleep, instruct them to tie a napkin, towel, or supportive wrap around the elbow joint. This physically restricts inadvertent, tight elbow flexion, making the pathomechanical posture impossible to adopt.

Short-Term Pharmacotherapy

Prescription of simple systemic analgesics and topical anti-inflammatory liniments for a duration of 7 days to manage residual neurochemical inflammation, supplemented with routine vitamins to support tissue recovery.