Rotator Cuff Tear vs Impingement: A Guide to Your Shoulder Pain

Published in The Ospina Orthopedic Blog ~ 5 min read ~ Last Updated: August 17, 2025

The Frustration of Unexplained Shoulder Pain

It’s a familiar story for many: a sharp pain when you reach into a high cabinet, a nagging ache when you put on your coat, or a dull throb deep in your shoulder that wakes you up at night. When shoulder pain begins to interfere with your daily life, the first question is always, "What is causing this?" The challenge is that many different shoulder conditions can have surprisingly similar symptoms, making it difficult to know the source of the problem.

Two of the most common culprits behind shoulder pain are shoulder impingement and a rotator cuff tear. While they are closely related and can even occur together, they are distinct conditions that require different treatment strategies. This guide will help you understand the difference between them and explain how a specialist determines the true cause of your pain.

A Quick Look Inside Your Shoulder

To understand the difference between impingement and a tear, it helps to know the basic anatomy of your shoulder. Your shoulder is a ball-and-socket joint. The "ball" is the top of your upper arm bone (the humerus), and the "socket" is part of your shoulder blade (the scapula).

Two key structures are involved in these conditions: 

• The Rotator Cuff: This is a group of four muscles and their tendons that surround the shoulder joint, acting like a "cuff" to keep the ball of the humerus centered and stable in the socket. It’s what allows you to lift and rotate your arm. 
• The Acromion: This is the bony "roof" of your shoulder, located at the top of your shoulder blade. The rotator cuff tendons pass through a narrow space beneath the acromion.

Impingement vs. Tear: What's the Difference?

Although both conditions involve the rotator cuff, the underlying problem is fundamentally different.

Shoulder Impingement: A "Pinching" Problem

Shoulder impingement, also called subacromial impingement syndrome, is essentially a "space" problem. It occurs when the rotator cuff tendons and the bursa (a fluid-filled sac that provides lubrication) get pinched or compressed in the narrow space under the acromion. This "pinching" typically happens when you lift your arm overhead. 

• Causes: Impingement is often an overuse injury caused by repetitive overhead activities, like swimming or painting. It can also be related to poor posture or anatomical factors, such as the shape of your acromion or the development of bone spurs that narrow the space. 
• Symptoms: The pain is often described as sharp and intermittent initially, which can progress to a constant, dull ache. It is typically felt on the top and outer side of the shoulder. You might also experience weakness, but this is often due to the pain of movement rather than an actual structural failure of the muscle.

Rotator Cuff Tear: A Structural Injury

A rotator cuff tear is a "tissue damage" problem. It means there is a physical tear in one or more of the rotator cuff tendons. These tears can be: 

• Partial: The tendon is frayed or damaged but not completely severed. 
• Full-Thickness: The tendon is torn completely, detaching it from its connection to the humerus bone. 
• Causes: Tears can happen suddenly from an injury, like a fall. However, they more commonly occur over time due to degeneration and wear, often as a direct result of chronic impingement where the tendon is repeatedly rubbed against the bone. 
• Symptoms: The pain from a tear is often described as being centered in the front of the shoulder and can radiate down the side of the arm. It is frequently worse at night, especially when lying on the affected side. The key differentiating symptom is often significant weakness when trying to lift or rotate your arm—this is because the muscle is no longer properly connected to the bone. Some people also report a crackling or popping sensation (crepitus) with movement.

Why a Precise Diagnosis is Non-Negotiable

Because the right treatment for your shoulder pain depends entirely on the correct diagnosis, getting a comprehensive evaluation from a musculoskeletal expert is the most important first step you can take. A specialist can distinguish between rotator cuff vs impingement  and other potential causes of pain through a careful and systematic process. This process is a clear demonstration of the expertise required to move patients toward an effective treatment plan.

The diagnostic journey at a premier interventional orthopedics practice involves more than just a brief chat. It is a thorough, collaborative experience that builds a complete picture of your shoulder health. It starts with a detailed medical history and a hands-on physical examination. During the exam, a physician will assess your range of motion and strength and perform specific maneuvers—like the Neer's test, Hawkins-Kennedy test, or "Empty Can" test—designed to stress different structures in the shoulder to help pinpoint the source of pain.

Based on the physical exam findings, advanced imaging may be used to confirm the diagnosis and determine its severity. 

• X-rays can identify structural issues like bone spurs or arthritis that may be causing impingement. 
• Musculoskeletal Ultrasound or MRI provides a detailed view of the soft tissues, allowing the physician to see inflammation in the bursa or tendons and, most importantly, to identify if a rotator cuff tear is present, how large it is, and which tendons are involved.

From Confusion to Clarity

Shoulder pain can be complex, and its symptoms are often confusingly similar. However, shoulder impingement and rotator cuff tears are distinct conditions that require tailored treatment strategies. The first and most critical step toward feeling better is moving from uncertainty to a clear, precise diagnosis.

Stop guessing about the source of your shoulder pain. To get a precise diagnosis and understand the most effective non-surgical options for your specific condition, schedule a thorough evaluation with Dr. Matthew Kohler of Ospina Medical today.

A Riley Publication ~ Branded Thought  Leadership by Riley Partners and Publications, Inc.

Medically Reviewed by: Matthew Kohler, MD

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Disclaimer

This article is for informational purposes only and does not constitute medical advice. Please consult with your healthcare provider for any personal health concerns.