Atraumatic osteonecrosis of the talus

Area of Science:

• Orthopedic Surgery
• Radiology
• Rheumatology

Background:

• Atraumatic osteonecrosis of the talus is a rare condition.
• It often affects young to middle-aged adults and can be associated with systemic diseases.
• Risk factors include autoimmune disorders, alcohol use, and smoking.

Purpose of the Study:

• To evaluate the clinical outcomes of treating atraumatic osteonecrosis of the talus.
• To determine the effectiveness of non-operative management, core decompression, and arthrodesis.
• To identify the typical presentation and imaging findings of talar osteonecrosis.

Main Methods:

• Retrospective review of 37 ankles in 24 patients diagnosed with atraumatic osteonecrosis of the talus between 1974 and 1996.
• Patients were assessed using the Mazur ankle score and Ficat and Arlet radiographic staging.
• Magnetic resonance imaging (MRI) and bone scans were used to evaluate the extent of osteonecrosis.

Main Results:

• Sixty-seven percent of patients had systemic diseases, primarily systemic lupus erythematosus.
• Most osteonecrosis occurred in the posterolateral aspect of the talar dome.
• Non-operative management was successful in only two ankles; core decompression was effective for stage-II disease, with 29 of 32 ankles showing fair-to-excellent outcomes.
• Arthrodesis was performed for stage-III or IV disease, with all six ankles achieving fusion.

Conclusions:

• Core decompression is a viable treatment option for precollapse (stage-II) atraumatic osteonecrosis of the talus.
• Early diagnosis and intervention, including non-operative treatment or core decompression, can potentially prevent the need for ankle arthrodesis.
• Screening of the hips for osteonecrosis is recommended in patients with talar osteonecrosis.