Objective By observing the clinical efficacy of different needle-retaining lengths of superficial needling in treating hemiplegic shoulder pain after stroke, to find the optimal needle-retaining length for hemiplegic shoulder pain after stroke. Method A total of 120 patients with hemiplegic shoulder pain after stroke were randomized into group A, group B, group C and group D, 30 cases in each group. The four groups were intervened by superficial needling. The needle-retaining lengths were 10 minutes in grou...