3 Throwing Mechanics Every Pitcher Should Address After an Arm Injury

July 22, 2026•3 min read

3 Throwing Mechanics Every Pitcher Should Address After an Arm Injury - Lewis Physical Therapy & Sports Rehabilitation

What You'll Learn in This Blog

Returning to throwing after an injury involves much more than simply making the shoulder or elbow stronger. In this article you'll learn the three mechanical areas we evaluate during rehabilitation, why they matter, and how improving movement quality can reduce stress on the arm while building a safer return to pitching.

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Throwing Mechanics Should Be Part of Rehab

One of the biggest mistakes after an arm injury is focusing only on the injured tissue.

While restoring strength and mobility is essential, movement quality throughout the kinetic chain often determines how much stress ultimately reaches the shoulder and elbow.

Rather than trying to completely rebuild a pitcher's mechanics, rehabilitation should focus on improving movement patterns that help the body transfer force efficiently.

1. Backside Mechanics

Everything starts with the lower body.

One of the first things I evaluate is how well a pitcher uses their back hip during the stride phase.

Instead of simply falling toward home plate, pitchers should learn how to drive down the mound using their glutes and lower body.

Poor backside mechanics often lead to:

Early trunk rotation
Increased shoulder and elbow stress
Poor force production

During rehab we also evaluate hip range of motion and glute utilization to determine why a pitcher may struggle with this movement.

2. Trunk Position and Hip-Shoulder Separation

The trunk serves as the bridge between the lower body and the arm.

A stable trunk allows force generated by the legs to transfer efficiently into the baseball.

We evaluate:

Trunk tilt
Glove-side positioning
Hip-shoulder separation
Core stability

Poor trunk positioning often causes pitchers to compensate with their shoulder or elbow later in the delivery.

3. Arm Action and Timing

Finally, we evaluate the arm itself.

Common issues include:

Excessive horizontal abduction (arm is flying behind the body)
Late arm action
Poor elbow positioning (unable to achieve at least 90 degrees of elbow flexion)
Delayed arm timing

These movement patterns can significantly increase stress on both the anterior shoulder and the medial elbow.

Rather than immediately jumping into aggressive throwing, many athletes benefit from one to two weeks of drill work to rebuild proper movement patterns before progressing into a structured throwing program.

Drill Work Can Be Extremely Valuable

Especially following surgery or a long layoff, drill work helps pitchers regain awareness of where their arm is in space.

This improves proprioception, coordination, and confidence before throwing at higher intensities.

While it may feel like slower progress initially, investing extra time into movement quality often pays off throughout the remainder of the rehabilitation process.

Final Thoughts

Throwing mechanics during rehabilitation aren't about creating the perfect delivery.

They're about reducing unnecessary stress while helping athletes build efficient movement patterns that support both recovery and long-term performance.

When rehabilitation, strength training, throwing progression, and coaching all work together, pitchers are put in the best position for a successful return to competition.

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Jeff Lewis, PT, DPT, ATC, LAT, CSCS

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