## 4 Discussion
The main benefits resulting from algorithm application are an objective evaluation of muscle and nerve function, the possibility of the individualised diagnostic and therapeutic process in each patient, correlation of the current status of neural structures function with imaging studies, and planning and controlling the surgical treatment. The available literature databases do not provide clear and comprehensive data on the algorithms of rehabilitation procedures in patients with brachial plexus injuries, similar to those presented in our study, developed especially using the results of neurophysiological tests. Few scientific reports correlated the results of neurophysiological tests with imaging tests or selected rehabilitation procedures, but they did not concern the starting base for further therapeutic procedures [49; 50; 51]. An extensive review by [PERSON] et al. [52] shows that a clear rehabilitation process has not been developed yet. The rehabilitation focuses mainly on exercise therapy, sensory training, neuroelectromagnetic stimulation, and the strategy of neurotrophic factors utilising acupuncture and massage therapy. In contrast, interventions like hydrotherapy, photo-therapy, and neural stem cell therapy are described as secondary significance. Exercise therapy concerns mostly passive range of motion, active-assisted range of motion, active range of motion, strength-increasing procedures, and other elements of PNF kinesisotherapy [53]. Objective functional assessment of the brachial plexus based on clinical neurophysiology studies also refers to the classification of peripheral nerve damage according to Seddon (neuroprasia, axonotmesis, neurotoresis) and allows for the adaptation of therapeutic procedures, both surgical and rehabilitation, following the current functional state of the brachial plexus neural structures and bioelectrical activity of upper extremity muscles. Each rehabilitation procedure has the potential to physically affect tissues in a specific way, influencing their functions, including molecular and biochemical ones [45]. The selection of an appropriate rehabilitation technique should therefore refer directly to the registered functional changes in nerves and muscles, which would influence the optimisation of rehabilitation progress. Moreover, neurophysiological tests performed before rehabilitation become the basis for prospective assessment of the health patient's statement. In the current research, the progression of functional deficits concerned the scope of innervation and function of the deltoid and biceps brachii muscles. This corresponds to damage at the level of the upper trunk of the brachial plexus and the axillary and musculocutaneous nerves. Depending on the deficit range in bioelectrical muscle activity, isometric muscle exercises that demonstrate at least minimal voluntary activity are recommended. For other muscles that show moderate functional deficits in EMG studies, active-passive and active exercises with loading are recommended. Due to the primarily post-ganglionic  
Figure 2: Proposal of the rehabilitation algorithm in patients after the brachial plexus injury based on the neurophysiological test results presented in this study. nature of the nerve damage (at the level of [PERSON]'s point), attention should be turned to the need for electrostimulation of the motor fibers of the brachial plexus as well as muscle stimulation. Electrical stimulation of muscles allows for maintaining the activity of myocytes and prevents their atrophy until regenerative processes in the nerve appear. The orientation of the stimulation electrodes from the anode to the cathode is consistent with the orthodromic (physiological) conduction of nerve impulses towards the effector. The sensory deficits demonstrated in the SNCS examination should be an indication to improve proprioception in those areas of the upper limb that showed the extent of deficits in terms of peripheral and dermatomal innervation (in the case of damage also preganglionic at the level of the spinal roots).