Introduction

Define gait and the normal gait cycle

The pattern of limb movement during locomotion, primarily walking, is called gait. It is an essential part of human motion and involves intricate musculoskeletal and neurological synchronisation. Joint mobility, strength, neurological control, and balance significantly impact a person’s stride (distance covered by a step), and any alteration to these components may result in abnormal gait patterns.¹ Gait analysis is frequently utilised in clinical settings to examine and diagnose neurological or musculoskeletal disorders.²

The sequence of movements that takes place during the foot’s first contact with the ground and that foot’s subsequent contact with the ground is called the normal gait cycle. It is divided into two main phases: the stance phase,  which makes up approximately 60% of the cycle 

when the foot is in touch with the ground and the swing phase, which covers the remaining 40% of the cycle when the foot is in the air, approaching the next stance phase. There are multiple sub-phases within each phase to ensure energy-efficient and comfortable walking. A typical gait cycle is symmetrical, rhythmic, and provides stability and effective propulsion.

A brief overview of the peroneal tendons and their function

The peroneus longus and peroneus brevis tendons, which run behind the lateral malleolus (the bony protrusion of the ankle) and down the outside of the lower leg, make up the majority of the peroneal tendons. These tendons offer dynamic stability during movement by joining the lower leg’s peroneal muscles to the foot’s bones.⁴ 

Their primary roles include stabilising the ankle, supporting balance and propulsion during walking or running, and foot eversion, which involves turning the sole of the foot outward. The peroneus longus crosses beneath the foot’s arch to support it as well.⁵ These tendons are crucial for daily functioning as well as athletic performance since they are especially active during activities involving lateral movement or uneven terrain.

How altered gait can lead to or worsen peroneal tendonitis

The chance of developing peroneal tendonitis, a disorder characterised by irritation and inflammation of the peroneal tendons, can significantly increase with altered gait. Uneven weight distribution, excessive inward rolling of the foot, or excessive outward rolling are examples of abnormal walking patterns that can put the peroneal tendons under constant, uneven stress. The outside of the ankle and foot experiences discomfort, fluid retention, and inflammation as a result of the microtrauma caused by this repeated tension.⁶

The peroneal tendons have to compensate for instability or poor biomechanics in the lower leg when the gait cycle is altered. Tendon overuse may result from this high effort over time, especially while performing activities such as running, walking, or prolonged standing. Untreated altered gait patterns cause peroneal tendonitis to be more severe and challenging to cure since they not only delay recovery but also raise the risk of persistent tendon degradation.

Anatomy and function of the peroneal tendons

Location and role of the peroneus longus and brevis

The two crucial muscles in the lower leg are the peroneus brevis and the peroneus longus. Both muscles originate at the fibula and extend into the foot as tendons behind the lateral malleolus, the outside ankle bone. The peroneus longus crosses beneath the foot and inserts at the base of the medial cuneiform and first metatarsal. The primary objective is to support the transverse arch and evert the foot, which turns the sole outward and improves foot stability and balance when walking. At the base of the fifth metatarsal, the peroneus brevis inserts, situated beneath the peroneus longus. Its main function is to facilitate foot eversion, and it offers lateral ankle stability, particularly on uneven surfaces and when bearing weight. In combination, these muscles are essential for maintaining gait efficiency and shielding the ankle against inversion injuries. 

Importance of ankle stability and eversion

Ankle stability and eversion are greatly enhanced by the peroneus brevis and peroneus longus, particularly while engaging in dynamic exercises like jogging, walking, and balancing on uneven terrain. These muscles prevent ankle sprains by everting the foot, which means it shifts the sole outward and prevents excessive inward rolling. The peroneal tendons stabilise the lateral ankle joint and prevent rolling injuries to the foot and ankle by actively opposing inversion forces.

 Additionally, the peroneus brevis strengthens the lateral foot and controls the ankle, while the peroneus longus wraps below the foot to support the arch. When paired together, they guarantee dynamic support and functional alignment, both of which are critical for safe and effective movement. Ankle instability, poor balance, and increased risk of overuse injuries such as peroneal tendonitis can result from weakness or dysfunction in these muscles.⁷

Gait abnormalities

Types of gait abnormalities 

Abnormal walking patterns that are frequently caused by muscular, structural, or neurological problems are known as gait abnormalities. Antalgic gait refers to a limping walking pattern to avoid discomfort, supination refers to an outward rolling pattern, and overpronation means excessive rolling of the foot inward are common forms. 

Other types, such as spastic or Trendelenburg gait, may occur from nerve injury or muscle weakness. When the lateral ankle and foot are overloaded during movement, these deviations can cause atypical stress on the lower limbs, which can lead to overuse injuries such as peroneal tendonitis. Efficient rehabilitation and injury prevention depend on recognising and resolving gait abnormalities.

Assessment techniques for gait (e.g., visual analysis, gait labs, wearables)

In order to diagnose walking impairments and provide treatment, gait assessment is essential. Methods vary from gait labs that use motion sensors and force plates to obtain entire biomechanical data to analyse. Wearable technology, such as small insoles and trackers, is increasingly providing easily available, real-time information on foot pressure, cadence, and stride.  These instruments assist in the successful detection of conditions such as peroneal tendonitis, progress tracking, and tailoring rehabilitation strategies. 

The biomechanical link between gait and tendon health

How abnormal gait alters tendon loading

When normal biomechanics is altered, walking patterns can drastically change, which can drastically change tendon loading, mainly in the peroneal tendons. Changes in gait, such as supination and overpronation, result in an unequal distribution of force across the ankle and foot.⁸ 

The peroneus longus and brevis tendons may be overly or repeatedly strained as a result, especially during the stance and push-off phases of running or walking. Conditions like peroneal tendonitis may develop as a result of the inflammation, microtrauma, and tendon tissue degradation caused due to increased mechanical stress over time. Thus, reducing tendon overload and damage necessitates correcting irregularities in gait.

Diagnosis and assessment

Clinical tests and imaging 

Imaging methods and clinical testing are used to diagnose concerns with the peroneal tendon. Clinical tests that detect pain, weakness, or swelling connected to peroneal tendonitis include the single-leg hop test, palpation along the tendon route, and resisted eversion. For a more comprehensive examination, imaging is essential. 

Ultrasound can identify injuries or inflammation and provides a dynamic, real-time view of tendon mobility. High-resolution soft tissue images from magnetic resonance imaging (MRI) enable precise evaluation of tendon tears and degeneration. When used together, these tools ensure precise diagnosis and direct treatment planning.

Management and rehabilitation

Conservative treatment: rest, orthotics, physical therapy

With an emphasis on symptom relief and tendon recovery, conservative treatment is frequently the initial line of treatment for peroneal tendonitis. The use of orthotics, such as ankle braces or supportive shoes, to improve gait mechanics and relieve stress on the tendons, as well as rest, to lessen tendon tension and allow inflammation to reduce, are important strategies. Moreover, physical therapy is essential because it uses manual techniques and specific exercises to improve ankle strength, proprioception, and flexibility.³ When used early, these non-invasive techniques help manage symptoms, stop progression, and promote long-term care. Besides, wearing proper footwear can significantly aid in preventing these conditions.

Surgical options 

Surgical intervention may be needed if conservative treatment fails to alleviate severe peroneal tendonitis.⁹ Depending on the extent of the injury, surgical treatments include tendon repair by suturing partial tears, debridement by removing damaged tendons, or tendon transfer. In order to stabilise the tendons, surgeons may sometimes also treat underlying structural problems, such as deepening the fibular groove. Restoring strength and mobility requires post-operative rehabilitation, and surgery is often only contemplated when conservative measures have been unsuccessful for a considerable period.¹⁰

Summary

This article explains what impact peroneal tendonitis has on walking patterns. The inflammation of the peroneal tendon that is located along the outer ankle is referred to as peroneal tendonitis. This inflammation may lead to compensation or altered movement of the ankle and foot, leading to abnormal walking patterns. Additionally, this article addresses the biomechanical link between gait and tendon health and the management techniques for its treatment. Abnormal gait patterns mainly cause compensatory movements like overpronation or supination, which lead to irregular weight bearing, thus causing gait abnormalities. Some of the management options include rest, orthotics, and physiotherapy. In severe cases, surgery may be advised; however, it is important to consult a doctor to begin the treatment of this condition.