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ART:085: Scapular Positioning and Its Role in Shoulder Health

Executive Summary

The scapula (shoulder blade) serves as the stable platform from which the arm moves. Proper scapular positioning—slightly retracted and depressed with the medial border flush against the ribcage—is essential for efficient shoulder mechanics, optimal arm acceleration, and injury prevention. In tennis, scapular dysfunction is a primary contributor to shoulder injuries including impingement, rotator cuff tendinopathy, and labral tears. Understanding scapular positioning is essential for maintaining shoulder health throughout a tennis career.

Scapular Anatomy

Key Landmarks

  • Medial border: Should be flush against the ribcage
  • Lateral border: Should be stable, not winging
  • Acromion: Forms the roof of the shoulder joint
  • Glenoid fossa: The socket that articulates with the humeral head

Muscular Control

  • Upper trapezius: Elevates the scapula
  • Middle trapezius: Retracts the scapula
  • Lower trapezius: Depresses and upwardly rotates the scapula
  • Serratus anterior: Protracts and upwardly rotates the scapula; prevents winging
  • Rhomboids: Retract and downwardly rotate the scapula

Ideal Scapular Position for Tennis

Ready Position

  • Slightly retracted: Medial border close to the spine
  • Slightly depressed: Inferior angle below the acromion
  • Flush against ribcage: No winging or tipping

During the Serve

  • Loading phase: Scapula retracts and depresses as the arm cocks back
  • Acceleration phase: Scapula upwardly rotates as the arm swings forward
  • Contact: Scapula is stable, providing a solid base for arm movement
  • Follow-through: Scapula protracts and downwardly rotates as the arm decelerates

Common Scapular Dysfunctions

Scapular Winging

  • Description: The medial border lifts off the ribcage
  • Cause: Weak serratus anterior
  • Consequence: Reduced shoulder stability, impingement risk

Scapular Tipping

  • Description: The inferior angle lifts off the ribcage
  • Cause: Weak lower trapezius, tight pectoralis minor
  • Consequence: Reduced subacromial space, impingement

Scapular Elevation

  • Description: The scapula is held too high
  • Cause: Overactive upper trapezius, weak lower trapezius
  • Consequence: Reduced shoulder mobility, neck pain

Practical Application: "The Scapular Check"

Before serving, consciously set your scapula: pull it back and down, feeling it flatten against your ribcage. Maintain this position during the loading phase, and allow natural upward rotation during acceleration. If you feel your shoulder "riding up" or "tipping forward," you have scapular dysfunction that needs correction through targeted exercises.