Introduction: Knowledge of the biomechanics of the arch of adult foot is really important to assess the variations in the Medial Longitudinal Arch(MLA) and categorizing the aetiology of Adult Acquired Flatfoot (AAF). Both the static and dynamic footprint parameters were studied. Materials and Methods: Bengali adult patients of age group 20 to 30 yrs. (of both sexes) at I.P.G.M.E. __ampersandsignamp; R , Kolkata and NIOH , Kolkata ,with or without foot pain symptoms were included in the study . Static footprint parameters like footprint ratio or Staheli__ampersandsign#39;s Arch Index (AI) and the ratio of Vertical Height of Navicular (Arch Height) and lowest palpable medial part of talus from ground level (Medial Arch Height) was measured. Lateral radiographs of the foot with ankle and knee immobilized were taken to estimate AH __ampersandsignamp; MAH. The other attributing factors like increased Body Mass Index , obesity (mainly in females), Posterior Tibialis Tendon dysfunction and incidence of plantar fasciitis were also measured. Data Obtained were analyzed and presented with counts and percentage. Results : Dynamic footprint parameters __ampersandsignndash; like Contact Force Ratio and Navicular Drop were estimated at the Gait Lab of N.I.O.H. through a capacitance platform . A significant correlation between the two variables was elicited through a scatter diagram accounting for the aetiology of AAF. Incidence of accessory navicular or subluxation of talocalcaneonavicular joint (TCN) or laxity of spring ligament having an effect on MLA could not be traced in the present study though shown by previous authors. Conclusion: The resultant conclusion creates immense potential in the field of conservative management - like specially designed footwear for AAF or surgical correction of AAF in athletes or military personnel.