Reflex sympathetic dystrophy of the knee.

Area of Science:

• Orthopedics
• Neurology
• Rehabilitation Medicine

Background:

• Reflex sympathetic dystrophy (RSD), now known as Complex Regional Pain Syndrome (CRPS), is a debilitating condition.
• RSD of the knee presents unique challenges in diagnosis and management.
• Limited data exists on the long-term functional outcomes of knee RSD.

Purpose of the Study:

• To evaluate the long-term functional prognosis of patients with reflex sympathetic dystrophy of the knee.
• To assess the impact of early versus late diagnosis and treatment on outcomes.
• To identify objective measures of recovery in knee RSD.

Main Methods:

• A retrospective study of 19 patients diagnosed with reflex sympathetic dystrophy of the knee.
• Patients were categorized based on the timing of diagnosis and treatment (early vs. late).
• Objective functional assessment using the Cybex II dynamometer at an average follow-up of 3.4 years.

Main Results:

• Patients receiving early diagnosis and treatment (within six months) demonstrated better outcomes compared to those treated late.
• Despite early intervention, no patient achieved complete normality on objective Cybex II dynamometer testing at long-term follow-up.
• Objective functional deficits persisted in all patients, irrespective of treatment timing.

Conclusions:

• Early diagnosis and treatment are crucial for improving outcomes in knee RSD.
• Current treatment modalities offer limited success in achieving full functional recovery.
• The long-term prognosis for reflex sympathetic dystrophy of the knee remains adverse, highlighting the need for novel therapeutic strategies.