the relationship between hallux dorsiflexion and ankle joint complex frontal plane kinematics a preliminary study background it has been suggested that the function of the first metatarsophalangeal joint may be related to the motion of the ankle joint complexobjective this study explored the relationship between ankle joint complex and first metatarsophalangeal joint motion during gait in a group of 14 who demonstrated clinically limited passive hallux dorsiflexion in quiet standing cases and 15 matched controlsmethod an electromagnetic tracking system was used to measure the ankle joint complex frontal plane motion and first metatarsophalangeal joint sagittal plane motion during gait in both cases and controls the case group was then evaluated further to investigate the effect of an orthosis on first metatarsophalangeal joint motionfindings the correlation between maximum ankle joint complex eversion and maximum first metatarsophalangeal joint dorsiflexion during gait was r0471 within the case group maximum rearfoot eversion was reduced following the application of the orthoses but there was no change in sagittal first metatarsophalangeal joint rotationsinterpretation the relationship between maximum ankle joint complex eversion and first metatarsophalangeal joint dorsiflexion kinematics found in this study was moderate and decreasing maximum ankle joint complex eversion with an orthosis did not result in any increase in first metatarsophalangeal joint dorsiflexion during gait in patients with functional first metatarsophalangeal joint limitation these results do not support the assumption that ankle joint complex eversion influences first metatarsophalangeal joint motion substantially