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Foot and Ankle Gait Loading Strategy

Original Editor - Ewa Jaraczewska

Top Contributors - Ewa Jaraczewska and Jess Bell  

Introduction

The loading strategy describes how the foot and ankle move to absorb load, from initial contact to contralateral toe-off. It shapes much of what follows in the gait cycle, including propulsion. Understanding what needs to happen at each joint during loading, and what compensations can emerge throughout the kinetic chain, helps clinicians reason through lower limb presentations.[1]

The Loading Strategy in the Gait Cycle

The loading strategy begins at initial contact, when the heel strikes the ground. Initial contact is a single moment rather than a phase, and it is followed immediately by the loading response. During the loading response, the ankle briefly plantarflexes as the forefoot is lowered to the ground under eccentric control of the ankle dorsiflexors.[2] Once the forefoot is on the ground, the tibia begins to advance over the foot and the ankle moves into dorsiflexion. The foot also pronates, flattening to the ground at both the rearfoot and midfoot. The loading response ends when the toes of the contralateral foot leave the ground. This marks the start of midstance. Midstance sits between loading and propulsion.[1] For clinical purposes, early midstance, when the foot is still absorbing force, can be grouped with loading, and late midstance with propulsion.[1]

Although loading and propulsion are described separately, they are closely linked. What happens in early stance influences what is possible later, and the reverse is also true. For example, if the body senses that dorsiflexion will be limited later in stance, it may introduce a compensatory strategy earlier in the gait cycle (e.g. externally rotating the foot).[1]

Energy Absorption and Return

An efficient loading strategy involves progressive, well-timed dorsiflexion as the tibia advances over the foot, and pronation as the medial arch lowers in a controlled way. Together, these movements allow the foot to absorb force.[1] As the foot deforms in this way, it stores some elastic (potential) energy, which is converted back to kinetic energy during propulsion.[3][4][5]

To better understand this concept, consider the analogy of three balls dropped onto the ground:[1]

  • A well-inflated basketball deforms slightly on contact and rebounds almost to its starting height. This represents an efficient foot, which absorbs load and returns energy effectively.
  • An underinflated basketball deforms too much on contact and barely rebounds. This represents an overly compliant foot, which dissipates energy instead of storing it.
  • A baseball is hard and barely deforms, so it lands with a thud and bounces very little. This represents an excessively stiff foot, which deforms too little to effectively absorb load or store energy.

The Closed-Chain Mechanics of Loading

During loading, the foot is fixed on the ground and the leg moves over it. In this closed-chain position, no joint moves in isolation; motion at each joint depends on, and influences, the joints above and below it.[6][7] The following sections describe joint motions that occur as the tibia advances over the planted foot during loading.

Tibial Internal Rotation and Ankle Mortise Opening

The tibia internally rotates as it advances and the fibula glides slightly posteriorly, opening the mortise to accommodate the wider anterior aspect of the talus. Without this accommodation, dorsiflexion may be restricted.[1][8]

Talocrural Dorsiflexion

As the tibia advances over the planted foot, the talus glides posteriorly within the mortise. This movement produces talocrural dorsiflexion.[7][1]

Subtalar Pronation

During loading (i.e. closed chain), the subtalar joint pronates. This involves plantarflexion and adduction of the talus and eversion of the calcaneus.[7] Because the talus articulates with the navicular, and the calcaneus with the cuboid, this movement changes the orientation of the midtarsal joint, reducing bony congruency and 'unlocking' the midfoot to allow it to deform.[1]

Talonavicular Lowering

As the talus plantarflexes and adducts during pronation, the navicular lowers relative to the talus. The two bones are highly congruent, so if the talus does not move well, the navicular may not lower effectively, and vice versa.[9][10]

Cuneonavicular and First Ray Dorsiflexion

As the navicular lowers towards the ground, there is dorsiflexion at the cuneonavicular joint. Without this, the first metatarsal would be driven into the ground. Instead, the ground 'blocks' the first metatarsal, resulting in relative dorsiflexion at the first ray.[1]

Loading Strategy Patterns of Dysfunction

Three broad patterns of dysfunction show up clinically, and none of them is inherently pathological. They typically represent reduced efficiency rather than damage. Dysfunction can relate to how much motion occurs, when it occurs, or both.[1]

Excessive stiffness (rigid foot) occurs when motion is restricted throughout the foot and ankle. It is characterised by limited dorsiflexion, limited rearfoot pronation, and limited midfoot unlocking. Because there is less segmental deformation at the foot, energy absorption and transfer are reduced.[11][12] Patients with a rigid foot often have a louder gait because they hit the ground harder, which increases the forces through the bones and joints. Additionally, because the foot lacks spring-back off the ground into propulsion, muscular demand increases elsewhere in the kinetic chain.[1]

Excessive compliance (overly compliant foot) occurs when the foot moves too much during loading. The rear foot and midfoot often pronate excessively, so the foot appears to 'collapse' to the ground. Energy is dissipated rather than stored, reducing the energy available for propulsion, and stress on the plantar fascia, tibialis posterior and other tissues can increase.[1]

Mismatched stiffness and mobility occurs when one region is stiff while an adjacent region moves excessively to compensate. At the foot, this often involves limited ankle dorsiflexion. To compensate, the rearfoot or midfoot may collapse medially so that the tibia can keep advancing. Alternatively, the foot may externally rotate, allowing the body to advance without needing as much dorsiflexion.[1]

Kinetic Chain Restriction During Loading Strategy

A critical clinical skill is recognising that a visible compensation (e.g. a 'collapsing' midfoot) does not necessarily originate at the joint where the collapse is seen. Restriction can be driven from multiple directions, as the following examples show.[1]

  • If the tibia does not rotate internally, the mortise may not fully open, and dorsiflexion can be restricted from above.
  • If the talus has limited posterior glide within the mortise, the ability of the tibia to advance is reduced. The talus may compensate by adducting excessively and biasing towards plantarflexion.[7] This creates an appearance of foot 'collapse' that is actually occurring at the talus, rather than the subtalar or midtarsal joints.
  • If the navicular does not lower well (due to medial column restriction or hypomobility of the talonavicular or cuneonavicular joints), talocrural dorsiflexion may be reduced. This means that a dorsiflexion restriction can originate distally, not just proximally.[13]
  • If subtalar pronation is limited, the midtarsal joint may not align, which can limit navicular lowering. This in turn can restrict the talus and reduce dorsiflexion.[14]

These examples show why assessment should extend beyond the area where the problem is seen. A useful rule of thumb is to look above and below a segment that is not moving well.[1]

Clinical Application

The following points can help clinicians reason through how a patient's loading strategy may relate to their symptoms:[1]

  • Look at the system first. Is the person globally stiff, overly compliant, or showing a regional mismatch? Do not zoom in on a single joint before understanding the overall strategy.
  • Identify where motion is excessive or restricted, and form a hypothesis to test. The visible fault may be compensating for a restriction elsewhere, so look both proximally and distally.
  • Do not assume that every altered loading pattern is a mobility problem. Some patients present with reduced motor control rather than restricted motion, so confirm a restriction on testing before mobilising.
  • Remember the goal is not perfect mechanics. The aim is mechanics that are good enough for the person's needs, restoring enough motion and timing to reduce stress on overloaded tissues, rather than achieving a textbook-ideal gait pattern.
  • Still treat the diagnosis. Mechanical analysis may help explain why stress builds in certain tissues, but it should be used alongside, not instead of, condition-specific management.

Additional Resources

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 Kaplan A. Understanding Loading Strategy in Gait Analysis Course. Physiopedia Plus, 2026.
  2. ↑ Brockett CL, Chapman GJ. Biomechanics of the ankle. Orthop Trauma. 2016 Jun;30(3):232-238.
  3. ↑ Kelly LA, Lichtwark G, Cresswell AG. Active regulation of longitudinal arch compression and recoil during walking and running. J R Soc Interface. 2015 Jan 6;12(102):20141076.
  4. ↑ Stearne SM, McDonald KA, Alderson JA, North I, Oxnard CE, Rubenson J. The foot's arch and the energetics of human locomotion. Sci Rep. 2016 Jan 19;6:19403.
  5. ↑ Riddick R, Farris DJ, Kelly LA. The foot is more than a spring: human foot muscles perform work to adapt to the energetic requirements of locomotion. J R Soc Interface. 2019 Jan 31;16(150):20180680.
  6. ↑ Tourillon R, M'Baye M, Smith M. Restoring ankle dorsiflexion range of motion in athletes: an individualized clinical decision-making system. Frontiers in Sports and Active Living. 2025 Oct 22;7:1677383.
  7. ↑ 7.0 7.1 7.2 7.3 Medina McKeon JM, Hoch MC. The ankle-joint complex: a kinesiologic approach to lateral ankle sprains. J Athl Train. 2019 Jun;54(6):589-602.
  8. ↑ Stanek JM, Brown B, Barrack J, Parish J. A novel manual therapy technique is effective for short-term increases in tibial internal rotation range of motion. J Exerc Rehabil. 2021 Jun 30;17(3):184-191.
  9. ↑ Vogler HW, Bojsen-Møller F. Tarsal functions, movement, and stabilization mechanisms in foot, ankle, and leg performance.Journal of the American Podiatric Medical Association. 2000 Feb 1;90(2):112-25.
  10. ↑ Behling AV, Welte L, Kelly L, Rainbow MJ. Human in vivo midtarsal and subtalar joint kinematics during walking, running and hopping. J R Soc Interface. 2024 May;21(214):20240074.
  11. ↑ Wang Y, Qi Y, Ma B, Wu H, Wang Y, Wei B, Wei X, Xu Y. Three-dimensional gait analysis of orthopaedic common foot and ankle joint diseases. Front Bioeng Biotechnol. 2024 Feb 22;12:1303035.
  12. ↑ Tovaruela-Carrión N, Casado-Hernández I, Becerro-de-Bengoa-Vallejo R, Losa-Iglesias ME, López-López D, et al. Spatiotemporal and foot kinematic differences during gait in individuals with cavus foot. Sci Rep. 2025 Dec 29;15(1):44896.
  13. ↑ Richie Jr DH. Foot biomechanics. InAtlas of Orthoses and Assistive Devices 2026 Jan 1 (pp. 221-240). Elsevier.
  14. ↑ Behling AV. It's all about the talus: Understanding the relationship between human foot morphology and function. PhD Thesis, School of Human Movement and Nutrition Sciences, The University of Queensland, 2025.
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