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E-Scooter Shoulder Injuries Explained | AC Joint Dislocation | Dr Kenneth Cutbush.

In this video Dr Kenneth Cutbush, Orthopaedic Shoulder Surgeon in Brisbane, explains how e-scooter accidents can cause acromioclavicular (AC) joint injuries, using a real clinical case and MRI imaging to demonstrate the injury patterns.

A 32-year-old man presented after falling from an e-scooter and landing directly onto his shoulder, resulting in significant pain and deformity. Imaging confirmed an AC joint dislocation.

What Is the AC Joint?

The acromioclavicular (AC) joint is the joint between:

The clavicle (collarbone)
The acromion (part of the shoulder blade)

It is stabilised by:

The AC joint capsule
The coracoclavicular ligaments (conoid and trapezoid)

Clinic Findings Explained

Comparison with the opposite (normal) shoulder clearly shows:

Noticeable widening of the AC joint on the injured side
Increased separation between the clavicle and acromion
Mild widening between the clavicle and coracoid process, suggesting ligament involvement

This asymmetry confirms a pathological AC joint injury rather than normal anatomical variation.

MRI Findings

MRI imaging demonstrates:

Significant fluid and bruising around the AC joint
Fluid tracking across the top of the clavicle
Complete disruption of the AC joint capsule, as fluid should normally be contained
Partial preservation of the conoid ligament
Near-complete disruption of the trapezoid ligament, which appears indistinct (“mush”)

These findings explain both the pain and the visible deformity.

AC Joint Injury Classification

Dr Cutbush explains the Rockwood classification:

Type 1

Mild sprain of the AC joint capsule
No significant widening

Type 2 (This Case)

Disruption of the AC joint capsule
Partial tear of coracoclavicular ligaments
Moderate widening without major clavicle elevation

Type 3

Complete rupture of AC joint capsule
Complete rupture of coracoclavicular ligaments
Clavicle sits significantly higher than normal

Based on imaging and clinical findings, this injury is best classified as a high-grade Type 2 AC joint dislocation.

Key Takeaway

✔ Yes e-scooters can be dangerous for your shoulder, particularly when falls occur directly onto the lateral shoulder.

AC joint injuries are common in:

E-scooter accidents
Cycling crashes
Contact sports
Falls onto the shoulder

Understanding the injury grade is essential for guiding treatment and recovery expectations.

Who This Video Helps

This video is optimised for people searching for:

AC joint dislocation, e-scooter shoulder injury, AC joint MRI, shoulder ligament injury, coracoclavicular ligaments, shoulder trauma explanation, orthopaedic shoulder surgeon Brisbane.

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