Upper limb contribution during tandem gait in multiple sclerosis: An early marker of balance impairments

Tandem gait is widely used during clinical exams to evaluate dynamic balance in chronic diseases, such as multiple sclerosis (MS). The early detection of balance impairments in MS is challenging to improve the un-derstanding of patients' complaints. The objective was to propose two indexes to quantify the contributions and inefficiency of limb and trunk movements during tandem gait in early-stage MS patients. Fifteen patients with remitting-relapsed MS, with a median Expanded Disability Status Scale of 2.5 [0-4] were compared to 15 matched healthy participants. Three-dimensional motion analysis was performed during tandem gait to calculate spatiotemporal parameters, contribution and inefficiency indexes, based on the linear mo-mentum of body segments. Compared to healthy participants, MS patients at the early stage of disease executed tandem gait with higher speed (p = 0.03) and increased step length (p = 0.03). The contribution indexes of upper limbs were significantly decreased during swing phase in MS patients. The inefficiency index for the upper limbs were around twice higher for MS patients compared to healthy participants. Since the additional movements concerned only light body segments and not contribute to the whole-body forward progression during tandem gait, they could reflected more both upper limb movements alterations and restoring movements to avoid loss of balance during tandem gait around swing phase in MS. These quan-tified indexes could be used as physical markers to quantify both the balance deterioration and the efficiency of rehabilitation program during the follow up of MS from the early stage of their disease.

Automated summary

Tandem gait is commonly used to evaluate balance in chronic diseases like MS. In this study, two indexes were proposed to measure limb and trunk movements during tandem gait in early-stage MS patients. The results showed that MS patients had higher speed and step length during tandem gait compared to healthy participants. The contribution indexes of upper limbs were decreased and the inefficiency index was higher in MS patients. These indexes can be used as physical markers to evaluate balance deterioration and rehabilitation efficiency in early-stage MS.