Written by Harry Wolf.
Foot and ankle disorders… They can impair mobility before structural damage becomes obvious on routine imaging. Pain, restricted motion, and reduced muscular control can all change how a person accepts weight, advances over the foot, and generates propulsion.
Assessment must extend beyond identifying, say, an injured tendon, unstable ligament, or degenerative joint.
The clinical question is how that abnormality affects loading during meaningful activities and whether treatment can improve function without creating additional demands elsewhere.
An integrated approach combines structural assessment, movement analysis, and the patient’s activity goals – that is, rather than assuming that a corrected image necessarily represents restored function.
The Biomechanics
Normal walking requires coordinated movement across the ankle, hindfoot, midfoot, and forefoot. Disorders affecting one region can alter the contribution of neighboring structures – although the resulting adaptations vary between patients and activities.
Altered Alignment and Load Distribution
Progressive collapsing foot deformity is more than worth mentioning. Why? Because it illustrates why alignment cannot be understood through a single tendon or arch measurement.
The disorder can involve:
- Hindfoot valgus
- Forefoot abduction
- Medial-column instability
- Displacement around the talonavicular and subtalar joints
A 2024 review published by the National Library of Medicine (Acquired Pes Planovalgus : Current Concepts) describes a multistructural process involving ligament support, tendon function, and skeletal alignment.
Posterior tibial tendon dysfunction may contribute – but treating it as the sole explanation can overlook other components of collapse.
Another review published by the National Library of Medicine about weightbearing computed tomography measurements in progressive collapsing foot deformity is worth exploring.
It states that weight-bearing CT can characterize three-dimensional relationships – that are difficult to appreciate on conventional projections.
The relevant question? It is whether that additional information changes the understanding of deformity or the proposed intervention.
Foot shape alone should not determine treatment. Symptoms, flexibility, functional limitations, and evidence of progression… They all help distinguish a tolerated structural variation from a clinically significant disorder.
Tendon Dysfunction and Impaired Propulsion
Tendon-related symptoms can reduce a patient’s ability to tolerate repeated loading, even when a major structural defect is absent. Achilles tendinopathy provides an important example…
Achilles tendinopathy can affect walking, stair climbing, and running, all of which impose different demands on the plantar-flexor system.
Pain, muscle performance, and activity-related limitations… All of those should all be assessed. A patient who manages level walking comfortably may still lack the capacity needed for repeated heel rises or faster locomotion, after all.
Clinical interpretation should separate pain-limited performance from persistent strength or endurance deficits. Improvements in one domain do not establish recovery in the others – so follow-up should include tasks relevant to the patient’s intended activities.
Anatomical location also matters when interpreting evidence. Recommendations developed for midportion Achilles tendinopathy should not automatically be applied to insertional symptoms or other tendon disorders – without considering their distinct clinical features, that is.
Ligament Injury and Degenerative Joint Loading
Ligament injury… It can leave a combination of mechanical instability, impaired sensorimotor control, and altered movement strategies. Recurrent giving-way episodes therefore require more than an assessment of passive ligament laxity.
Fracture-related incongruity and persistent malalignment are relevant considerations – but cartilage deterioration cannot be reduced to a single loading variable.
For the individual patient, previous trauma changes the context in which persistent pain and restricted motion should be evaluated. It does not establish that arthritis is inevitable or that every detectable gait deviation will accelerate joint damage.
The practical implication is to assess potentially modifiable impairments while acknowledging uncertainty about long-term structural outcomes.
Symptom control, improved stability, and better walking tolerance remain meaningful goals – even when disease modification cannot be demonstrated.
Now, let’s move on to looking at the implications that such disorders can have for mobility and long-term joint health.
Reduced Walking Efficiency and Restricted Daily Mobility
When do altered mechanics become clinically important? When they limit activities that matter to the patient.
Assessment should establish whether difficulty arises during initial weight acceptance, forward progression, push-off, or prolonged repetition – that is, rather than recording walking ability as a simple yes-or-no outcome.
A focused functional review can prioritize three areas:
- Walking distance and symptom behavior during repeated loading
- Stair performance and single-limb support
- Footwear tolerance and restrictions in daily activities
Repeated visits may be needed to compare these findings with strength, motion, and patient-reported function.
Choosing accessible local care can make reassessment and coordination more practical for patients – when rehabilitation requires adjustments over time, that is.
For example, if patients are based in Maryland, it could make sense to consult Maryland orthopedic specialists, such as orthopedic physicians, physician assistants, physical therapists, and chiropractors, at OrthoMaryland.
Coordination… It should still be judged by the clinical process – rather than the number of disciplines available, that is. A shared plan needs:
- Clear functional goals
- Agreed progression criteria
- A method for identifying when symptoms warrant reassessment
Instability and Reduced Confidence
Chronic ankle instability… It can affect physical performance. It can also affect confidence during demanding tasks.
Clinical assessment should distinguish:
- Recurrent sprains
- Perceived giving way
- Avoidance of activities
Why? Because those experiences do not necessarily reflect the same underlying impairment.
A randomized trial by the Journal of Athletic Training evaluated six weeks of balance training in 24 young adults with chronic ankle instability. Both conventional balance training and training combined with cognitive tasks improved selected proprioceptive and postural-control measures.
For patients, the finding supports addressing sensorimotor performance – rather than focusing exclusively on passive stability. However… The small, young study population limits assumptions about older adults, complex injuries, or long-term prevention of recurrent sprains.
Treatment response also needs to be measured at the level being targeted.
Another randomized trial, originally published by the Journal of Manual & Manipulative Therapy, found that plantar massage and ankle mobilization did not change the measured gait biomechanics in participants with chronic ankle instability.
An intervention may – therefore – have a limited role without producing a broader movement change. Clinicians should avoid interpreting an improvement in one impairment as evidence that habitual walking mechanics have normalized.
Follow-up can pair patient-reported confidence with observable performance during progressively challenging tasks.
Persistent giving way, worsening symptoms, or failure to advance should prompt reconsideration of the diagnosis and treatment strategy – that is,rather than indefinite repetition of an unchanged program.
Degeneration and Compensatory Demands on Other Joints
Restricted motion in one part of the foot can coexist with compensatory movement elsewhere. Whether that adaptation is helpful, symptomatic, or potentially harmful depends on the patient’s overall mechanics – and cannot be established from its presence alone.
A prospective study published by MDPI in 2025 examined first metatarsophalangeal arthrodesis in 10 patients and compared their movement patterns with 15 healthy controls. Pain improved after surgery – while compensatory forefoot and hindfoot motion remained evident.
For clinical counseling? The important distinction is that pain relief and restoration of normal movement are separate outcomes.
Similar caution is needed when discussing ankle degeneration. Post-traumatic osteoarthritis can be connected with interacting mechanical and biological processes – thus, supporting a broader assessment than alignment alone.
Also, longitudinal monitoring should remain functional. Changes in walking tolerance, motion, footwear needs, and symptom distribution can help determine whether an adaptation remains acceptable or requires further investigation.
Preserving Mobility Through Targeted Treatment
Now, let’s look at treatment selection. It should follow the dominant impairment – rather than the diagnostic label alone.
After all, a patient whose main limitation is tendon-loading intolerance presents a different rehabilitation problem from someone with, say, rigid deformity, recurrent instability, or painful joint degeneration.
The revised guideline summarized by the American Physical Therapy Association supports progressive tendon-loading exercise for midportion Achilles tendinopathy. And it advises against complete rest.
When it comes to deformity management, it is important that the structures involved are considered – alongside whether the deformity remains flexible, that is. The clinical objective is to match support, rehabilitation, or surgical planning to the actual pattern of dysfunction.
Reconstructive procedures also require explicit outcome priorities. Substantial pain improvement can coexist with persistent compensatory motion, after all.
Across treatment pathways, reassessment should test the original functional hypothesis. If the intended gain was better push-off, longer walking tolerance – or fewer instability episodes – those outcomes should be measured directly rather than inferred from symptom relief alone.
Loss of Protective Sensation and Threats to Tissue Integrity
Neuropathy introduces a different biomechanical concern: repetitive pressure may damage tissue without producing a reliable pain response. In patients with diabetes, deformity and reduced protective sensation can therefore make symptom-based monitoring insufficient.
For these patients, assessment must extend beyond joint motion and walking performance.
Comfortable walking does not necessarily indicate safe loading. Callus, skin changes, and footwear-related pressure… They all deserve attention – even when the patient reports little discomfort.
Specialized therapeutic footwear is best for people with diabetes at high risk of ulceration.
Footwear selection should address the identified pressure problem – that is, rather than simply accommodate the visible shape of the foot.
Incorporating those measures into the management plan keeps tissue protection alongside mobility goals – particularly when pain cannot serve as a dependable warning signal.
Understanding Biomechanics Matters
When are the biomechanics of foot and ankle disorders most useful clinically? When they connect structural findings with movement limitations and realistic treatment goals.
Assessment should distinguish pain relief, restored capacity, improved stability, and changes in joint mechanics – rather than treating them as interchangeable outcomes.
Long-term care benefits from clear baseline measures and planned reassessment. Uncertainty about future degeneration should be acknowledged – without diminishing the value of meaningful functional improvement.
Hopefully this article has been informative. If so, be sure to explore some of our related content.
Author bio:
Harry Wolf is a freelance writer. For almost a decade, he has written on topics ranging from healthcare to business leadership for multiple high-profile websites and online magazines.
References:
- Physiopedia contributors. 2023. Biomechanical Assessment of Foot and Ankle. Physiopedia.
https://www.physio-pedia.com/Biomechanical_Assessment_of_Foot_and_Ankle
- Dressler, H. B., de Carvalho, K. A. M., Zambelli, R., Mansur, N. S. B., & de Cesar Netto, C. 2024. Acquired Pes Planovalgus : Current Concepts – “From Adult Acquired Pes Planovalgus to Progressive Collapsing Foot Deformity”. National Library of Medicine.
https://pmc.ncbi.nlm.nih.gov/articles/PMC11663050/
- Fayed, A. M., Jones, M., de Carvalho, K. A. M., Mansur, N. S. B., & de Cesar Netto, C. 2025. Weightbearing Computed Tomography Measurements in Progressive Collapsing Foot Deformity: A Contemporary Review. National Library of Medicine.
https://pmc.ncbi.nlm.nih.gov/articles/PMC11863214/
- Anderson, D. D., Ledoux, W. R., Lenz, A. L., Wilken, J., Easley, M. E., & de Cesar Netto, C. 2024. Ankle osteoarthritis: Toward new understanding and opportunities for prevention and intervention. National Library of Medicine.
https://pmc.ncbi.nlm.nih.gov/articles/PMC11981820/
- Chai, L., Sun, X., Huang, Q., Huang, T., Guo, X., & Liu, H. 2024. Cortical Changes of Dual Cognitive-Task Balance Training in Patients With Chronic Ankle Instability: A Randomized Trial. National Library of Medicine.
https://pmc.ncbi.nlm.nih.gov/articles/PMC11611372/
- Alamri, R., Migel, K., Cain, M. S., Song, K., Pietrosimone, B., Blackburn, J. T., Franz, J. R., Jang, J., Lin, F.-C., & Wikstrom, E. A. 2024. Plantar massage or ankle mobilization do not alter gait biomechanics in those with chronic ankle instability: a randomized controlled trial. National Library of Medicine.
https://pmc.ncbi.nlm.nih.gov/articles/PMC11578414/
- de Bot, R. T. A. L., Stevens, J., Staal, H. M., Meijer, K., & Witlox, A. M. 2025. A Prospective Study Evaluating Gait and Clinical Outcome Following First Metatarsophalangeal Arthrodesis for Hallux Rigidus. MDPI.
https://www.mdpi.com/2673-7078/5/3/46
- Henderson, A. Undated. Achilles tendinopathy. Bupa.
https://www.bupa.co.uk/health-information/muscles-bones-joints/achilles-tendinopathy
- American Diabetes Association Professional Practice Committee. 2025. Retinopathy, Neuropathy, and Foot Care: Standards of Care in Diabetes—2025. National Library of Medicine.
https://pmc.ncbi.nlm.nih.gov/articles/PMC11635040/

Written by Charles Schubert.