## 4 Discussion  
The results of our study show a medial and anterior displacement of the CoP, and a redistribution of plantar pressure in the evaluated areas under both study conditions. These observations were collected using minimalist footwear which allows the intrinsic evaluation of the different CFO features. This approach effectively eliminates external factors such as footwear-related variables. Firstly, we studied the medio-lateral and antero-posterior displacement of the CoP. The result is similar for both treatments. Regarding medio-lateral displacement, both conditions caused a medial shift of the CoP compared to the shed without CFO during midstance, with no significant differences between the two treatments. The primary cause of this shift originates from the full-contact orthotic that shifts the pressure towards the medial arch. This approach is valuable since it helps to address the lateral shift in pressure that has been reported in the literature in patients with HL because of the limited dorsiflexion at the hallux [40]. Regarding the antero-posterior displacement, both treatments exhibit an increase in anterior displacement during midstance; however, cut-out CFO also showed this in the propulsion phase. Some authors [41] demonstrated that patients with HL demonstrated an extended duration of the midstance phase with a reduction in the walking speed and step length. [PERSON] et al. [25], showed that using a cut-out CFO in patients with HL led to an acceleration in the anterior displacement speed of the CoP. Therefore, it is conceivable that using a treatment that increases both the anterior displacement of the CoP and its velocity, favoring the propulsive phase, could be beneficial in controlling and avoiding compensations in other joints of the body (typical of HL), preventing overload and the symptoms associated with this condition. To gain a deeper understanding of why this medial and anterior displacement of CoP occurs and to comprehend more specifically the foot's behavior with different treatments, a subsampling of the pedoaborgraphic data was performed. With the cut-out CFO, pressure on the hallux and lesser toes significantly decreased while midfoot and heel pressure increased. From this, it can be understood that cut-out CFO improves first MTPJ functionality by reducing pressure in areas typically affected by HL, countering its effect. Although an increase in pressure on the first MTH would be expected, this was not observed in our study. The literature on plantar pressure distribution with cut-out CFO is limited, with diverse protocols and insole designs yielding heterogeneous results. [PERSON] et al. [16] reported increased pressure on the first MTH with cut-out CFO, but their population are patients with HL and pronated foot who are in treatment; they applied corrections like the medial heel skive, complicating the isolation of forefoot element effects [30]. Additionally,the use of a cushioning element (Poron) and the absence of EVA extension in the hallmark could impact results [26; 42]. [PERSON] et al. [26] faced similar challenges than ours in the lesser toes and midfoot, indicating an increase in pressure, but a decrease in the first MTH and heel, contrasting our findings. Their focus on studying patients with painful HL may explain their results, as pain triggers compensatory mechanisms, leading to lateral load transfer. Notably, both studies used rigid thick-solved shoes [16] or the patient's footwear [26]; this could lead to an important bias, due to the change in the characteristics of each of the patients' shoes, being always more convenient to use the same type of shoe for all the subjects. A study similar to ours in terms of FO design [26], showed the same results as our study, but further investigation is needed to determine if the hallmark pressure reduction is due to improved functionality or the use of slightly softer materials. In addition to the study of plantar pressure, to provide a more functional perspective, measurements of the ratios were conducted [18].