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Complex regional pain syndrome (CRPS) type 1 is a painful condition commonly seen in hemiplegia and affects negatively the rehabilitation process. We report a case of 42-year-old male with right sided hemiplegia who developed acute inflammatory monoarthritis at the right knee joint during the stroke rehabilitation program. The patient also had clinically silent knee osteonecrosis (ON) that noticed after the clinical and radiological examination period for the inflammatory monoarthritis. The cause of the monoarthritis was investigated but it remained indeterminate. The coexistence of these two conditions led to a diagnostic confusion with complex regional pain syndrome type 1 (CRPSt1). In this case report we aimed to stimulate further thought in the field of misdiagnosing CRPSt1. We also discussed whether ON and inflammatory monoarthritis were related or not. We highlighted the importance of distinguishing CRPS and ON especially in stroke patients. A high index of suspicion could avoid diagnostic delay.

A Condition Confused with Complex Regional Pain Syndrome in Hemiplegia: Simultaneous Occurance of Knee Osteonecrosis and Monoarthritis