Feng 1993.

Methods	Randomisation and follow‐up period are unclear
Participants	The population included people with acute ankle (n = 306) or wrist (n = 154) injuries, age ranged from 18 to 46 years
Interventions	1. ultrasound & medium frequency electrotherapy (n = 230) 2. low frequency electrotherapy (n = 230)
Outcomes	Results are presented for overall improvement, based on reduction of pain, swelling, and extravasion: good, moderate, slight, or no improvement 1. 119/230 good;  28/230 moderate; 11/230 slight, 1/230 no improvement 2. 86/230 good; 57/230 moderate; 75/230 slight; 12/230 no improvement
Notes	Study is not included yet because it is only reported as an abstract. A full trial report has not been identified. There is no separate presentation of results for the 306 participants with ankle injuries. Abstract was assessed with help from a Chinese native speaker.