Researchers found stroke survivors regained hand function after Wii therapy (1). They targeted clients who already had some finger movement before treatment began. I know this for two reasons. First, subjects must have small finger movements to be eligible for the modified constraint therapy given to the control group. Second, the outcome measure was the Wolf Motor Function Test which is loaded with high level test items (e.g. turn key in lock, pick up a paper clip). Only stroke survivors with significant hand recovery can perform test items on the Wolf Test.
An efficacy study of the Smart Glove also used subjects who were high functioning enough to pass items on the Purdue Pegboard Test, the Jebsen-Taylor Test (e.g. write, scoop up beans with a spoon), and the Fugle-Meyer Test, distal items (e.g. pick up Coke can and piece of paper) (2).
Treatment may be appropriate only for a particular sub-set of clients so you should always read the description of the sample and outcome measures used in the study. Researchers of therapy approaches may have used a sample of high functioning subjects for their proof of concept study. This makes the treatment look good, but can create false hope.
1) Trinh T, Scheuer S, Thompson-Butel A, Shiner C, McNulty P. Cardiovascular fitness is
improved post-stroke with upper-limb Wii-based movement therapy but not dose-matched
constraint therapy. Top Stroke Rehabil. 2016; June 23(3):206-16.
2) Shin J, Kim M, Lee J, et al. Effects of virtual reality-based rehabilitation on distal upper
extremity function and health-related quality of life: a single-blinded, randomized controlled
trial. jrneuroengrehab.biomedcentral.com/articles/10.1186/s12984-016-0125-x. Accessed
January 31, 2017.