Osteonecrosis Humerus

Modern Study Review (AI-Generated)

High-Yield Summary

Osteonecrosis of the humeral head is a clinically significant cause of shoulder pain and dysfunction, second only to femoral head osteonecrosis in prevalence. Early diagnosis remains challenging due to the shoulder’s non-weightbearing nature, often leading to late presentations with advanced joint collapse. Current treatment focuses on symptom relief and preserving function, with hemiarthroplasty as the preferred surgical option in advanced stages. Despite advances, altering the natural history of the disease remains elusive.

Key Diagnostic Findings

Anatomy

• The humeral head is the second most common site for osteonecrosis after the femoral head.
• The region most affected corresponds to the area contacting the glenoid at approximately 60° of forward elevation.

Clinical Presentation

• Early symptoms: shoulder pain, especially with overhead activities and sleeping discomfort.
• Pain typically precedes significant loss of range of motion (ROM).
• Progressive disease leads to mechanical symptoms if loose bodies develop.

Imaging

Classification Systems

Cruess Classification (1978, CORR):

Note: No major updates to this classification system have been widely adopted, but MRI-based staging is now standard for early diagnosis.

Current Gold Standard Treatment

Non-operative

• Indications: Early-stage disease (Cruess I-II), minimal symptoms.
• Management:
• Analgesia and anti-inflammatory medications.
• Physical therapy focusing on maintaining passive ROM.
• Activity modification, especially avoiding overhead activities that increase joint reaction forces.
• Core decompression may be considered in early stages but lacks strong evidence for altering disease progression.

Operative

• Indications: Advanced disease (Cruess III-V), persistent pain, mechanical symptoms, or collapse.
• Options:
• Hemiarthroplasty: Preferred surgical treatment for advanced osteonecrosis; preserves glenoid and provides pain relief.
• Total shoulder arthroplasty (TSA): Generally discouraged in younger patients due to glenoid component loosening; may be considered in select older patients or those with glenoid involvement.
• Arthroscopic debridement: Reserved for mechanical symptoms from loose bodies, not disease-modifying.

Modern Complications & Outcomes

Complications

Outcomes

• Early diagnosis and conservative management may delay progression but rarely prevent collapse.
• Hemiarthroplasty provides reliable pain relief and functional improvement in advanced stages.
• Total shoulder arthroplasty outcomes are less favorable in younger patients due to glenoid loosening.
• Sickle cell patients may have a different natural history with less progression but higher surgical complication rates.

Classic Clinical Notes

Osteonecrosis of the Humeral Head

Reference: Loebenberg, Mark, Plate, A.M, Zuckerman, J.D., AAOS ICL Volume 48, Chapter 42

Main Message
Most people present late with this disease because of the non-weightbearing nature of the shoulder. The treatment options are limited, and hemiarthroplasty remains the mainstay of treatment of advanced osteonecrosis. The key is to identify it early (although one wonders if we truly have the ability to affect the natural history…)

Points of Interest

• The humeral head is the second most common site of osteonecrosis, after the femoral head.
• Matson: 4.6% of GH arthritis patients are secondary to osteonecrosis.
• Etiology: corticosteroids (most common), sickle cell disease (plus other hemoglobinopathies), trauma, Gaucher’s disease, alcoholism, tobacco use. Trauma is the big non-systemic cause.
• Prosthetic replacement in sickle cell is associated with a high rate of loosening.
• Risk of osteonecrosis after 3 and 4 part fractures ranges from 26 to 75%.
• Pathology: bone necrosis – vascular ingrowth with osteoprogenitor cells at the periphery that proliferate into fibroblasts – macrophages in the fibrous layer resorb dead bone while osteoblasts lay down new bone on the dead trabeculae, resulting in thickened, radiodense bone within an area of relative osteopenia. Restoration fails to keep up with resorption and the resulting weak bone collapses.
• Classification: Cruess, CORR, 1978. X-ray classification
• I: before changes (can be seen on MRI)
• II: sclerosis in superior central portion of the head
• III: crescent sign – caused by subchondral bone collapse; may have mild flattening
• IV: significant collapse of humeral articular surface.
• V: degenerative joint disease.
• Natural History: sickle cell patients tend not to progress. Corticosteroid patients tend to get symptomatic and progress. Those with stage III disease or worse tend to do poorly.
• Presentation: shoulder pain comes far before significant ROM loss. Sleeping discomfort. Difficulty with overhead activities in particular. The area of the head in contact with the glenoid at 60% of forward elevation corresponds to the region of the humeral head most often affected by flattening and collapse.
• MRI has a 91% sensitivity at identifying lesions early.
• Treatment: Has anything been shown to change the natural history? – not really
• analgesia, physio – to maintain full passive range, restricting overhead activities (these increase joint reaction force)
• core decompression – if early. Not really very promising.
• arthroscopic debridement if clearly mechanical loose body symptoms
• hemiarthroplasty – the authors clearly favor this vs total shoulder
• total shoulder – discouraged by the authors, primarily because of the age of the patients that present. Hawkins probably puts in the glenoid.

Thoughts: The natural history may not be affected by anything we do!

Last Updated on January 25, 2026 by orthonet