Understanding Shoulder Anatomy and Common Causes of Shoulder Pain

Shoulder pain affects people of every age, and it ranks among the most common musculoskeletal complaints seen in orthopedic offices today. In fact, research shows that shoulder pain has a point prevalence ranging from roughly 7% to 26% of the general population, with rotator cuff problems responsible for the majority of cases. Whether your discomfort stems from a sports injury, repetitive overuse, or a degenerative condition, understanding how the shoulder works is the first step toward finding real relief. This guide breaks down shoulder anatomy, the most common causes of shoulder pain, and when it’s time to see a specialist.

Dr. Oladapo M. Babatunde, MD, FAAOS, Medical Director of City Orthopaedics & Sports Medicine (COSM), treats shoulder pain and injuries at all three of the practice’s New Jersey locations: East Rutherford, West Orange, and Paramus. As a board-certified orthopedic surgeon, Dr. Babatunde has been recognized as a “Top Doctor” by New York Magazine and Jersey’s Best for seven consecutive years. He offers both nonoperative and surgical treatment options, always starting with the least invasive approach that fits each patient’s needs.

Shoulder Anatomy: A Brief Overview

The shoulder is one of the most complex and mobile joints in the human body. Unlike the hip, which is a deep, stable ball-and-socket joint, the shoulder trades some stability for an unusually wide range of motion. As a result, it relies heavily on surrounding muscles and connective tissue for support. Here is a breakdown of its main components.

Bones

• The shoulder consists of three main bones: the humerus (upper arm bone), the scapula (shoulder blade), and the clavicle (collarbone, connecting the arm to the body).

Joints

• The shoulder has two primary joints: the glenohumeral joint (between the humerus and scapula, often simply called “the shoulder joint”) and the acromioclavicular joint, or AC joint (between the clavicle and scapula). Together, these joints allow the arm to rotate, lift, and reach in nearly every direction.

Muscles

• The shoulder’s primary muscles include the deltoid and the four rotator cuff muscles: the supraspinatus, infraspinatus, teres minor, and subscapularis. Additionally, the trapezius helps stabilize the shoulder blade. Together, these muscles control movement and keep the joint centered during daily activities and sports.

Tendons and Ligaments

• Tendons connect muscles to bones, while ligaments connect bones to other bones. Both provide support and stability, and both are common sites of injury when the shoulder is overused or strained.

Common Causes of Shoulder Pain

Several conditions and injuries can lead to shoulder pain, and identifying the underlying cause is essential for effective treatment. Below are the conditions Dr. Babatunde sees most often in his East Rutherford, West Orange, and Paramus offices.

• Rotator Cuff Injuries: The rotator cuff stabilizes the shoulder joint, so tears or tendinitis in this area are among the leading causes of shoulder pain, particularly in athletes and older adults. Studies suggest rotator cuff disease accounts for up to 70% of shoulder-related visits to orthopedic clinicians.
• Frozen Shoulder (Adhesive Capsulitis): This condition develops when the joint capsule becomes stiff and inflamed, restricting movement. Without treatment, frozen shoulder can last for months, and sometimes years.
• Shoulder Impingement: Impingement happens when the rotator cuff tendons get compressed during overhead movement, which causes pain and limited mobility. It’s often linked to repetitive activities like swimming, throwing, or lifting.
• Shoulder Dislocation: A dislocation occurs when the head of the humerus slips out of the shoulder socket, or glenoid. This injury causes severe pain and requires immediate medical attention.
• Arthritis: Osteoarthritis, a degenerative joint condition, gradually wears down cartilage in the shoulder, leading to pain, stiffness, and reduced range of motion. Rheumatoid arthritis, an autoimmune disorder, can also affect the shoulder joint.
• Bursitis: The shoulder contains small, fluid-filled sacs called bursae that cushion the bones and muscles. When these sacs become inflamed, the result is bursitis, which often causes pain with movement or overhead reaching.

How Shoulder Pain Is Diagnosed

An accurate diagnosis starts with a hands-on physical exam. Dr. Babatunde tests range of motion, strength, and stability through a series of hands-on tests designed to isolate specific structures in the shoulder. From there, imaging often confirms the diagnosis.

• X-rays: Useful for identifying arthritis, bone spurs, or fractures.
• MRI: Provides detailed images of soft tissue, making it the preferred method for detecting rotator cuff tears, labral tears, and inflammation.
• Ultrasound: Sometimes used to evaluate tendons in real time, especially during movement.

Non-Surgical Treatment Options

City Orthopaedics & Sports Medicine follows a conservative-first philosophy. Consequently, most patients begin with non-surgical care before surgery is ever discussed.

• Rest and activity modification: Reducing overhead activity gives inflamed tissue time to heal.
• Physical therapy: Targeted exercises restore strength and balance and joint awareness, which helps prevent re-injury.
• Anti-inflammatory medication: Over-the-counter or prescription options can reduce swelling and pain.
• Corticosteroid injections: These can calm inflammation in cases of bursitis or persistent tendinitis.
• Ice and heat therapy: Alternating temperature therapy helps manage pain during flare-ups.

“Most shoulder pain responds well to conservative treatment when it’s addressed early. Surgery is never our first recommendation. We only consider it when a patient has exhausted non-surgical options or has a structural injury that truly requires repair,” says Dr. Oladapo Babatunde.

When Do You Need Surgery?

Surgery becomes a reasonable option only after conservative care has failed to relieve symptoms, or when the injury itself is severe enough to require repair. Dr. Babatunde typically considers surgical treatment when:

• Pain persists for several months despite physical therapy and medication.
• Imaging confirms a full-thickness rotator cuff tear.
• The shoulder repeatedly dislocates or feels unstable.
• Arthritis has progressed to the point of significant cartilage loss.
• Weakness or loss of function interferes with work or daily life.

Surgical Treatment Options

Arthroscopic Rotator Cuff Repair

This minimally invasive procedure uses small incisions and a camera to reattach torn tendons to the bone. Because the technique avoids large incisions, patients typically experience less post-operative pain and a faster return to daily activities than with open surgery.

Shoulder Arthroscopy for Impingement or Labral Tears

Arthroscopy allows Dr. Babatunde to remove inflamed tissue, smooth bone spurs, or repair labral tears through small incisions using a camera. This approach is well suited to active patients who want to return to sports or physical work.

Shoulder Replacement (Arthroplasty)

For patients with advanced arthritis, replacing damaged joint surfaces with an artificial implant can relieve pain and restore function. This option is generally reserved for cases where conservative treatment and less invasive procedures have not provided lasting relief.

Recovery Timeline

Weeks 0-2

• Arm is typically kept in a sling to protect the repair.
• Gentle passive motion exercises may begin under supervision.
• Pain and swelling are managed with medication and ice.

Weeks 2-6

• Physical therapy progresses to active-assisted range of motion.
• Sling use is gradually reduced based on healing progress.
• Light daily tasks become more manageable.

Months 2-4

• Strengthening exercises are introduced as tissue healing allows.
• Range of motion continues to improve toward pre-injury levels.
• Most patients return to desk work and light lifting during this phase.

Months 4-6 and Beyond

• Patients cleared for sports typically resume activity gradually.
• Full strength and motion continue to improve for up to a year in some cases.
• Follow-up visits confirm healing and function before full clearance.

Preventing Shoulder Pain

Prevention involves maintaining good posture, avoiding repetitive overhead strain, and performing regular shoulder-strengthening exercises. Additionally, warming up before sports and correcting throwing or lifting mechanics can lower the risk of injury. If shoulder pain does develop, early intervention gives you the best chance at a full and lasting recovery.

Get Expert Shoulder Care in Bergen and Essex County, NJ

Whether your shoulder pain stems from a sports injury, overuse, or arthritis, Dr. Oladapo Babatunde and the team at City Orthopaedics & Sports Medicine are here to help. No referral is required, and most major insurance plans are accepted. COSM serves patients across Bergen and Essex County at its East Rutherford, West Orange, and Paramus locations, along with surrounding communities.

Schedule your shoulder evaluation today and take the first step toward lasting relief.

Frequently Asked Questions

What is the most common cause of shoulder pain?

Rotator cuff problems, including tendinitis and tears, are the most common cause of shoulder pain. They account for a large share of shoulder-related visits, especially among adults over 40 and active athletes.

How long does shoulder pain usually last?

It depends on the cause. Minor strains often improve within a few weeks with rest and physical therapy, while conditions like frozen shoulder or untreated rotator cuff tears can persist for months without proper care.

Do I need surgery for shoulder pain?

Not usually. Most patients improve with conservative treatment, such as physical therapy, activity modification, and medication. Surgery is generally reserved for full-thickness tears, recurring instability, or cases where non-surgical treatment has not worked.

What is the difference between a rotator cuff tear and shoulder impingement?

A rotator cuff tear involves an actual rip in the tendon, while impingement occurs when the tendon gets compressed during movement without necessarily tearing. Impingement can lead to a tear over time if it isn’t addressed.

Where can I get shoulder pain treatment in New Jersey?

City Orthopaedics & Sports Medicine treats shoulder pain at its East Rutherford, West Orange, and Paramus, NJ locations. Book an appointment with Dr. Babatunde to get an accurate diagnosis and personalized treatment plan.