Lateral Line Dysfunctions
Lateral line dysfunctions? Don't forget to assess the calcaneocuboid joint.
Integral to the force on the calcaneocuboid joint is the peroneus longus. This muscle courses behind the lateral malleolus and around the cuboid under the foot before finally inserting into the lateral aspect of the base of the first metatarsal and medial cuneiform.
When this muscle contracts, it plantar flexes the first ray in addition to applying a rotary force to the cuboid.
When the cuboid becomes locked, the lateral aspect of the cuboid is often displaced dorsally and the medial aspect shifts toward the plantar surface. As a result of this, propulsion will present with excessive pronation of the midtarsal joint.
Signs to look for that may indicate dysfunction here include an inhibited or hypertonic TFL and/or peroneals, excessive rear or midfoot pronation, insufficient push off, and collapsing of the arch during gait.
Keep this one in mind the next time you notice any of these signs.
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