Introduction: Anterior cruciate ligament (ACL) rupture leads to biomechanics disturbances of the knee joint which are reflected also in the plantar supports. Our hypothesis is that a redistribution of the sole bilateral charges will be produced to allows the feet to get a new control system to compensate ACL rupture. The aim of this research is to study the plantar support pressures disturbances in patients with ACL rupture before operation.

Material and Methods: We analyzed the plantar pressure distribution in two populations: Group A: 39 males of 37 years average age (21–49 y.o), previous surgery of isolated ACL rupture, excluding patients with meniscal tear or serious cartilage damage, contralateral lesions and knee previous surgery as well. Group B (control group): 37 healthy males of 31 years average age (21–40 y.o) without any musculoskeletal disorders.

We performed physical examination and walking through a pedography plate (Emed, Novel Munich, Germany). We studied global plantar support (pressure, forces and areas) of each foot and also divided each foot into six parts. Data obtained was compared between group A, patients (healthy leg and ACL rupture leg) and group B (control group). Statistical analysis was performed with a non-parametric Wilcoxon test.

Results: Group A (healthy leg and ACL rupture leg) total support area of both feet were statistically superior than Group B total support area (p< 0,019 and p< 0,005 respectively). Evenly midfoot total support area was superior in Group A that in Group B, as well as midfoot force support (p< 0.089).

Group A midfoot pressure was higher in ACL rupture leg than in healthy leg (p< 0.007) and it was also higher to the one obtained for group B (p< 0.046). Evenly the anterior-external region of Group A, healthy leg got the highest pressure (p< 0.076), followed by Group A, ACL rupture leg (p< 0.022) and finally Group B.

Group B anterior-internal pressure was statistically superior to Group A, ACL rupture leg (p< 0.049) followed by Group A, healthy leg (p=0.022). During foot takeoff, first toe pressures were higher in Group B compared to Group A (p< 0.076).

Conclusion: ACL rupture shows differences in plantar support pressures distribution of both legs (ACL rupture leg and healthy leg) compared with a control population. The injured leg seeks balance decreasing heel support and increasing the contact surfaces between floor, midfoot and forefoot.