Foot orthoses are commonly modified to alter the distribution of plantar pressure and the moments acting across the joints of the foot. One such modification is the cuboid notch, also called a cuboid raise or cuboid pad. Despite the word “notch,” the modification creates a localised elevation beneath the cuboid rather than a hollow for the bone. It may be incorporated intrinsically into the orthotic shell during manufacture or added extrinsically with ethylene-vinyl acetate (EVA), cork, felt, or another padding material. Its intended effect is to provide a targeted reaction force beneath the lateral midfoot.
The anatomical rationale for the modification arises from the cuboid’s position within the lateral column. The cuboid articulates posteriorly with the calcaneus and anteriorly with the fourth and fifth metatarsals. It also contributes to the groove through which the peroneus longus tendon passes before crossing the plantar foot. Consequently, motion or loading around the cuboid can influence lateral-column stability, midtarsal mechanics, and medial forefoot function. A correctly positioned cuboid notch applies force to a relatively small area and may therefore affect both local tissue stress and the rotational tendency of the foot.
Clinicians prescribe the modification for several proposed purposes. A common indication is lateral midfoot pain associated with cuboid syndrome or suspected calcaneocuboid dysfunction. In this setting, the raise is intended to resist painful plantar or eversion movement of the cuboid and improve tolerance of weight-bearing. It may also be used to support a low lateral arch, reduce a sensation of the foot sliding laterally from an orthosis, or complement a device containing strong medial posting or a medial heel skive. Some practitioners employ it to encourage the centre of pressure to move medially during midstance and propulsion. This may promote use of the more efficient “high-gear” propulsive mechanism through the first and second metatarsals rather than continued loading of the lateral forefoot.
The biomechanical effect is not universally supinatory. Because the orthotic reaction force is applied lateral to several joint axes, a cuboid raise may create a pronatory moment at the subtalar or midtarsal joints. It may also plantarflex the fourth and fifth rays and, theoretically, improve the mechanical advantage of peroneus longus in stabilising the first ray. These effects can be useful when an orthosis otherwise shifts load too strongly medially. However, they also explain why the modification is not suitable for every patient with lateral pain. Its action depends on the precise location, height, contour, stiffness, footwear, and individual foot mechanics.
Accurate placement is therefore essential. A pad positioned too far laterally may increase pressure over a tender cuboid or create an unwanted eversion moment. In some cases, placing the apex more plantarmedially beneath the cuboid may better oppose the suspected direction of rotation. The modification should be smoothly contoured rather than abrupt, because a concentrated edge can cause discomfort, blistering, or avoidance gait. Its height is generally introduced conservatively and adjusted according to symptoms and functional response. Shoe depth must also be considered, as the raise occupies volume and may increase dorsal pressure within closely fitting footwear.
A practical advantage of an extrinsic pad is reversibility. Before prescribing a permanent shell modification, a clinician can conduct a treatment-direction test using adhesive felt or temporary padding beneath the corresponding area of the foot or orthosis. Improvement in pain, stability, gait, or a relevant functional task supports proceeding, whereas worsening symptoms indicates that the position, magnitude, or underlying hypothesis should be reconsidered. Once a raise has been moulded into a rigid shell it can be difficult to remove; EVA devices may be ground down, but an added pad is easier to reposition or discard.
The principal limitation of the cuboid notch is the weakness of its evidence base. Published literature describes cuboid syndrome, its proposed mechanisms, and treatments such as manipulation, taping, padding, and activity modification, but direct controlled research on cuboid notches in foot orthoses is lacking. There is no established consensus regarding indications, dimensions, or optimal placement. Clinical claims should therefore be framed as biomechanical hypotheses and experience-based practice rather than proven therapeutic effects. Lateral foot pain also has a broad differential diagnosis, including stress injury, peroneal tendinopathy, calcaneocuboid arthritis, nerve irritation, and fifth-metatarsal pathology; an orthotic modification should not substitute for appropriate assessment.
The cuboid notch is a focused and potentially useful modification for managing selected lateral-column problems or balancing the mechanical effects of an orthosis. Its value lies in the ability to apply a strategically placed plantar reaction force, yet the same force can aggravate symptoms when its direction or magnitude is inappropriate. Careful diagnosis, temporary testing, conservative dosing, accurate fabrication, and follow-up are therefore central to its use. Until stronger research is available, the cuboid notch is best regarded not as a standard correction, but as an individualised clinical trial within a broader management plan.
References
Durall, C. J. (2011). Examination and treatment of cuboid syndrome: A literature review. Sports Health, 3(6), 514–519. https://doi.org/10.1177/1941738111405965
PodiaPaedia. (n.d.). Cuboid notch. https://podiapaedia.org/wiki/foot-orthotics/design-features/lateral-column-support/cuboid-notch/