Functional neurological disorder supported by unintentional synergic movement: the hip abductor sign

A man in his 50s presented with a 2 year history of dysaesthesia and difficulty moving his left leg, which began acutely after workplace stress and sudden severe left groin pain while standing. Although the pain gradually improved, it persisted partially, accompanied by ongoing dysaesthesia below the left groin and a sensation of the left leg being ‘difficult to move’. Nerve blocks and trigger-point injections provided no relief. His medical history was unremarkable except for antibiotic treatment for cholelithiasis, and there was no preceding trauma.