Objective
To evaluate and quantify the medial longitudinal arch of foot using a 3-D foot scanner and 3-D arch measurement program. Method: 997 subjects (363 men and 634 women) were selected. The foot length, width, girth and medial longitudinal arch parameters were measured with a 3-D foot scanner (Nexcan^Ⱂ, K&I, Korea), analysis software (EnFOOT^Ⱂ, K&I, Korea) and 3-D measurement program of the medial longitudinal arch. Results: The mean arch lengths were 100.3 mm for men, 90.4 mm for women. The mean arch height and arch volume in both genders were 14.7 mm, 12.1 mm and 10.3 cm³, 6.0 cm³, respectively. We compared the arch parameters of both genders by univariate analysis of variance and in most cases the parameters of men were larger than those of women. Moderate positive relationships were found between foot length and arch width of talonavicular joint in cases of men, foot length and length from heel point to distal arch point in both genders (Pearson correlation coefficient＞0.3, p＜0.01). Conclusion: We evaluated the medial longitudinal arch of Korean feet three dimensionally. These data sould be a useful reference for making shoes, insoles, and orthoses. (J Korean Acad Rehab Med 2004; 28: 469-476)

Objective
To evaluate the influence of weight-bearing on foot shape measured by 3-D foot scanner. Method: Forty-two feet of twenty-one normal subjects were studied. The foot length, width, girth and arch parameters under non weight-bearing and weight-bearing conditions were measured by 3-D foot scanner (Nexcan^Ⱂ, K & I, Korea), analysis software (EnFOOT^Ⱂ, K & I, Korea) and 3-D foot arch measurement program. Results: The foot length, ball width, ball girth, waist girth, instep girth, short heel girth, long heel girth and length from heel point to proximal arch point significantly increased under weight-bearing condition (p＜0.01). However, vamp height, waist height, instep height, length of arch, height of arch, width of arch, length from heel point to distal arch point, maximal arch height and volume of arch were significantly decreased under 50% weight-bearing condition (p＜0.01). Conclusion: Foot parameters associated with length, width and girth increased but volume, width, length, and height of medial longitudinal arch decreased under weight bearing condition. We suggest that these findings under weight- bearing condition result from the pronation of subtalar joint and the decrement of heights of transverse and longitudinal arch heights. (J Korean Acad Rehab Med 2004; 28: 462-468)