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The theraputic effects of MI have been observed in patients recovering from total knee arthroplasty. In particular, improvements were noted in joint range of motion, muscle strength as well as in the reduction in pain.

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8) The therapeutic role of motor imagery during the acute phase after total knee arthroplasty a pilot study.pdf

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Similar findings were reported in a study on postural control. It was observed that application of anodal TDCS over M1 during MI resulted in better performance than MI alone or sham.
Twelve minutes of stimulation, and 12 minutes of MI single trial.

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Whilst the effects of short term TDCS in conjunction with MI have been examined, time off due to injury can be significant. Thus, future research should aim to examine the effects of long term applicaiton of this combination of techniques on recovery time.

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Motor imagery has been reported to be an effective technique for enhancing motor performance and skill acquisition in healthy athletic individuals. Gains reportedly observed in speed, strength,  and range of motion.
Postural control has also been reported to be improved in elderly.
MI improved performance in the activitites of daily living in patients
recovering from stroke.
Regional pain syndrome alleviated with MI.

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The effects of motor imagery post TDCS have also been reported to be superior to MI alone in young and apparently healthy participants on a novelty finger tapping task.
Thirteen minutes of constant TDCS of the right primary motor cortex,  singe trial.

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It has previously been reported that motor performance can be significantly enhanced if coupled with mental practice or imagery. Therefore, greater improvements in motor learning and performance might arise as a result of increased frequency and quality of MI when used together with TDCS.
Mental practicse with TDCS of M1 showed improvements in performance on a writing task.
Participant received 13 minutes of TDCS of the M1.

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The research suggests that anodal TDCS of the motor cortex increases the quantity and quality of spontaneous motor imagery (MI) in rapid eye movement (REM) sleep as well as in waking resting state. Thus, supporting the efficacy of TDCS as a technique for augmenting MI.

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  Can transcranial direct current stimulation (TDCS) of the motor cortex enhance the effects of motor imagery (MI) on acquisition of skills and motor control? In particular, can recovery time to pre-injury form be reduced with MI when performed together with TDCS during the time off and recovery? 

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  Can transcranial direct current stimulation (TDCS) of the motor cortex enhance the effects of motor imagery (MI) on acquisition of skills and motor control? In particular, can recovery time to pre-injury form be reduced with MI when performed together with TDCS during the time off and recovery? 

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There exists a large body of research on the positive affects of TDCS on motor control and skill acquisiton. Advances in technology are making this technique more accessible to general public thus providing an opportunity to take advantage of some of the proposed benefits.

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Transcranial direct current stimulation (TDCS) is a safe, non-invasive technique with minimal reported side effects.
It involves an application of a weak direct current over the scalp to induce neuroplasticity and modulate the electrical activity of the brain.
It has been shown that cortical excitation can be significantly affected by TDCS. In particular, anodal TDCS has an excitatory effect while cathodal stimulation reduces excitability.
Constant current ranging from 1-2 mA is typically delivered over 10-30 minutes.
Placement of electrodes significantly effects the results.