Microvascular supply of the lateral epicondyle and common extensor origin

Area of Science:

• Orthopedic Surgery
• Anatomy
• Sports Medicine

Background:

• Lateral epicondylitis, or tennis elbow, affects 1-3% of the population.
• The exact etiology of lateral epicondylitis remains unclear.
• A leading theory suggests hypovascularity at the common extensor origin contributes to the condition.

Purpose of the Study:

• To examine the microvascular supply of the lateral epicondyle and common extensor mass.
• To identify potential hypovascular zones implicated in lateral epicondylitis.
• To elucidate the anatomical basis for the pathogenesis of tennis elbow.

Main Methods:

• Utilized India ink injection and Spalteholz tissue-clearing technique on six cadaveric arms.
• Performed serial sectioning in coronal and axial planes.
• Documented microvascular patterns through photographic analysis before and after tissue clearing.

Main Results:

• Identified two distinct hypovascular zones within the lateral epicondyle region.
• The first hypovascular zone was located at the proximal lateral epicondyle.
• The second hypovascular zone was found 2-3 cm distal to the epicondyle on the deep common extensor tendon surface.

Conclusions:

• The identified hypovascular regions may impair the inflammatory and healing responses to microtearing.
• These zones of reduced vascularity are proposed as significant factors in the etiology of lateral epicondylitis.
• Understanding these anatomical vascular variations is crucial for addressing tennis elbow pathogenesis.