Primary Glenohumeral Osteoarthritis: A Leading Cause of Shoulder Pain and Stiffness

Primary Glenohumeral Osteoarthritis: A Leading Cause of Shoulder Pain and Stiffness

The Cliff News | October 11, 2026. Primary glenohumeral osteoarthritis is a significant degenerative disease affecting the shoulder joint. In this condition, the articular cartilage between the humerus (upper arm bone) and the glenoid (shoulder socket) gradually wears away, leading to excruciating pain, stiffness, crepitus (grinding sounds), and severe limitations in arm movement.

Although the shoulder is not a primary weight-bearing joint, advanced stages of this arthritis can severely disrupt a person's daily activities. The most prominent symptom is deep-seated shoulder pain. Initially, this pain occurs specifically during arm elevation, lifting heavy objects, or overuse, but as the disease progresses, it can persist even at rest and disturb sleep.

Alongside pain, joint stiffness gradually increases, particularly a notable decrease in external rotation of the arm. Routine actions like combing hair, dressing, reaching overhead, or reaching behind the back become extremely difficult. Some patients may also hear grinding or rubbing sounds when moving their shoulder, indicative of damaged cartilage.

Diagnosis and Testing Procedures

Physicians begin the diagnosis of primary glenohumeral osteoarthritis by carefully assessing the range of motion in both active and passive shoulder movements. This includes evaluating crucial movements like external rotation, abduction (moving the arm away from the body), and internal rotation (moving the arm towards the body).

Furthermore, a thorough examination of the rotator cuff muscles, deltoid muscle, and axillary nerve function is conducted. A key distinction is that if both active and passive movements are equally limited, it may indicate glenohumeral arthritis. Conversely, if muscle weakness is more pronounced than pain, it suggests a rotator cuff injury.

An examination of the patient's neck is also necessary to rule out cervical radiculopathy (pinched nerve in the neck) or pain originating from other parts of the body. In terms of diagnostic imaging, X-rays are the most important and accessible initial tool for this disease. Detailed assessment of the joint's condition is performed using various views, such as the true AP (anterior-posterior) or Grashey view and the axillary lateral view.

In specific cases, a scapular-Y view may also be utilized. X-rays can reveal signs such as reduced joint space, subchondral sclerosis (hardening of bone), bone cysts (small sacs), osteophytes (bone spurs) on the humeral head, and glenoid erosion. The humeral head may also shift posteriorly from its normal position.

When a more detailed, three-dimensional (3D) assessment of bone structure, glenoid wear, or surgical planning is required, a Computed Tomography (CT) scan proves to be a highly useful tool. Magnetic Resonance Imaging (MRI) is helpful in thoroughly evaluating the condition of the shoulder's rotator cuff, muscles, and other soft tissues, aiding in the identification of co-existing issues alongside arthritis.

Treatment Options: From Conservative to Surgical

The primary goal in the early and moderate stages of primary glenohumeral osteoarthritis is to manage pain and maintain shoulder function as much as possible. Physicians advise avoiding activities that aggravate pain, such as frequent overhead arm movements or lifting heavy weights.

Physiotherapy plays a crucial role, incorporating gentle range-of-motion exercises, scapular control exercises, and specific exercises to strengthen the rotator cuff. It is essential that all these exercises are performed according to the patient's tolerance and physical condition.

For pain relief, paracetamol or non-steroidal anti-inflammatory drugs (NSAIDs) can be used as per medical advice. When selecting these medications, it is crucial to consider any existing risks related to the patient's kidneys, heart, and stomach, as these drugs can have side effects.

In select patients, corticosteroid injections within the joint can provide temporary pain relief. However, it is important to note that treatments like hyaluronic acid, platelet-rich plasma (PRP), and stem cell injections are not yet certified treatments for cartilage regeneration and their effects may be limited.

When all non-surgical treatment efforts fail and the patient experiences persistent severe pain and functional limitations, shoulder arthroplasty (shoulder joint replacement) is considered. If the rotator cuff muscles are in good condition and the glenoid bone is sufficiently strong, anatomic total shoulder arthroplasty (where the artificial joint is placed to match the body's natural structure) may be a suitable option.

Conversely, if the rotator cuff is severely damaged and irreparable, or if conditions like cuff tear arthropathy (arthritis due to severe tears) exist, or certain complex bony deformities are present, reverse total shoulder arthroplasty (where parts of the artificial joint are reversed) is considered. The final decision for surgery depends on multiple factors, including the patient's age, bone quality, current muscle condition, overall medical health, and individual expectations.

Future Direction and Management

Effective management of primary glenohumeral osteoarthritis hinges on timely identification, the use of precise imaging techniques, and the creation of individualized treatment plans for each patient. Through accurate diagnosis and a systematic rehabilitation program, patients can better manage their pain and successfully maintain or improve their shoulder function.

This ensures that affected individuals can lead a quality life and carry out their daily activities without significant hindrance.