This study investigated the relationship between limited joint mobility (LJM; measured both passively and during gait) and plantar pressure measurements. A cross-sectional study involving 28 diabetic patients with peripheral neuropathy but no plantar ulceration (DN), 25 diabetic patients with ulceration (DU), 25 diabetic control patients with no ulceration or peripheral neuropathy (DC), and 25 non-diabetic reference subjects (NDR). Movements of the ankle joint complex (AJC) and 1st metatarsophalangeal (MTP) joint were recorded, together with plantar pressures. Despite a significant reduction in the passive ROM at the AJC in the diabetic groups, the gait ROM was indistinguishable from reference subjects and was not correlated with plantar pressure variables. At the 1st MTP joint, a correlation was found between the passive and gait ROM and furthermore the gait ROM was correlated with peak forefoot pressures, suggesting ROM measures at the 1st MTP joint may be preferable to ROM measures at the AJC.