Sesamoiditis

Lower Limb

Overview

Sesamoiditis is inflammation of the sesamoid bones beneath the first metatarsal head in the forefoot, commonly affecting the medial sesamoid. This condition results from repetitive micro-trauma, excessive pressure, or direct injury to these small bones embedded within the flexor hallucis brevis tendon, presenting with localized plantar pain and functional limitation.

Pathophysiology

The sesamoid bones act as a fulcrum for the flexor hallucis brevis tendon, distributing ground reaction forces across the first metatarsophalangeal joint during gait and propulsion. Repetitive stress, altered biomechanics, or direct trauma causes chronic inflammation of the bone, surrounding soft tissues, and the articulating surfaces. This leads to pain, swelling, and potential stress fracture or avascular necrosis if untreated.

Patient Education

Sesamoiditis typically improves with activity modification, proper footwear support, and graduated return to activity; avoiding walking barefoot and high-impact activities during acute phases is essential for recovery.

Typical Presentation

Site

Plantar aspect of the first metatarsal head, localized to the medial or lateral sesamoid; pain may radiate along the medial forefoot

Quality

Sharp, aching, or burning plantar pain with a dull underlying ache; may describe cracking or catching sensations

Intensity

Mild to moderate pain (3-7/10) initially, worsening with activity; intensity increases with weightbearing and push-off activities

Aggravating

Walking barefoot, high-impact activities (running, jumping, dancing), prolonged standing, tight footwear, repetitive forefoot stress, push-off phase of gait

Relieving

Rest, elevation, ice application, supportive footwear with cushioning and metatarsal pads, activity modification, strapping or taping

Associated

Swelling and tenderness over the sesamoid area, pain with dorsiflexion of the great toe, altered gait pattern favoring lateral foot, callus formation, clicking or catching sensation

Orthopaedic Tests

Turf Toe Test (Hallux Limitus)

Procedure

Patient supine or seated. Examiner passively dorsiflexes the first metatarsophalangeal (MTP) joint through full range of motion, assessing for pain and restricting movement.

Positive Finding

Pain or significant limitation of dorsiflexion (normally 65–90°), particularly at the plantar aspect of the first MTP joint where sesamoids reside.

Sensitivity / Specificity

See current literature / See current literature

Interpretation

Suggests first MTP joint pathology; consistent with sesamoiditis or hallux limitus. Pain on passive dorsiflexion implicates the sesamoid apparatus.

Sesamoid Compression Test (Squeeze Test)

Procedure

Patient supine or seated. Examiner applies direct medial and lateral compression to the sesamoids (located plantarly beneath the first metatarsal head) using thumb and index finger.

Positive Finding

Localized plantar pain directly over the sesamoid bones; pain may be unilateral (medial or lateral sesamoid) depending on which sesamoid is inflamed.

Sensitivity / Specificity

See current literature / See current literature

Interpretation

Direct palpation and compression of inflamed sesamoid tissue. High specificity for sesamoid involvement when pain is precisely localized and reproducible.

Great Toe Extension Stress Test

Procedure

Patient supine with foot relaxed. Examiner manually extends (dorsiflex) the hallux (great toe) at the MTP joint while applying gentle resistance or noting pain provocation during active extension.

Positive Finding

Sharp plantar pain at the first MTP joint or under the first metatarsal head, particularly during active or resisted extension.

Sensitivity / Specificity

See current literature / See current literature

Interpretation

Flexor hallucis longus and brevis muscles originate near/involve sesamoids; pain with extension suggests inflammatory involvement of the sesamoid complex.

Windlass Test (Modified Hallux Dorsiflexion Test)

Procedure

Patient standing or supine. Examiner passively dorsiflexes the hallux, which tightens the plantar fascia and increases pressure through the sesamoid apparatus. Observe pain response.

Positive Finding

Plantar foot pain beneath the first metatarsal head, increased tension in the arch, and reproduction of sesamoid-related symptoms.

Sensitivity / Specificity

See current literature / See current literature

Interpretation

Biomechanical test that loads the sesamoid complex via fascial tension. Positive result implicates sesamoiditis or associated plantar fasciitis.

First MTP Joint Palpation and Distraction

Procedure

Patient supine or prone. Examiner palpates the plantar aspect of the first MTP joint; then gently distracts the joint (separates metatarsal from phalanx) while maintaining palpation.

Positive Finding

Reproduction of pain during palpation; pain relief or diminution during distraction suggests intra-articular or sesamoid-related pathology rather than capsular involvement.

Sensitivity / Specificity

See current literature / See current literature

Interpretation

Distraction reduces compression and load on sesamoids; pain relief with distraction supports sesamoiditis diagnosis and may differentiate from joint capsulitis.

Single-Leg Stance or Weight-Bearing Tolerance Test

Procedure

Patient performs single-leg stance on the affected foot, or examiner assesses tolerance to weight-bearing through the first metatarsal head. Duration and pain response are noted.

Positive Finding

Sharp or burning pain localized to the plantar first metatarsal head; inability to sustain stance due to sesamoid pain; antalgic gait favoring lateral forefoot.

Sensitivity / Specificity

See current literature / See current literature

Interpretation

Functional test that reproduces load through sesamoids in weight-bearing. Positive finding indicates symptomatic sesamoid involvement affecting functional activities.

⚠ Red Flags

  • •Acute severe pain with inability to weightbear following trauma
  • •Signs of systemic infection (fever, spreading erythema, lymphadenopathy)
  • •Suspected sesamoid fracture with neurovascular compromise
  • •Progressive neurological symptoms or loss of foot sensation
  • •Unrelenting pain unresponsive to 6-8 weeks conservative management
  • •History of previous sesamoid surgery with recurrent symptoms

⚡ Yellow Flags

  • •High athletic demands with pressure to return to activity prematurely
  • •Perfectionist or overly competitive personality affecting compliance with activity modification
  • •Frequent barefoot walking due to lifestyle choices or cultural practices
  • •History of eating disorders or bone health concerns
  • •Low mood or depression affecting self-management
  • •Poor understanding of condition leading to non-compliance with offloading strategies

Osteopathic Techniques

Region

First metatarsophalangeal joint and sesamoid complex

Technique

Soft Tissue

Rationale

Soft tissue mobilization to the flexor hallucis brevis, adductor hallucis, and surrounding plantar fascia reduces muscle tension, improves local circulation, and decreases pain without direct pressure on inflamed sesamoids

Region

First metatarsophalangeal joint

Technique

Articulation

Rationale

Gentle passive and active range of motion mobilization maintains joint mobility, promotes synovial nutrition, and prevents stiffness while avoiding aggravating movements that stress the sesamoids

Region

Plantar fascia and forefoot

Technique

Functional

Rationale

Functional technique addresses the biomechanical relationships of the forefoot, allowing tissues to find positions of ease and promoting self-correction of mechanical dysfunction contributing to sesamoid stress

Region

Midfoot and ankle complex

Technique

MET

Rationale

Muscle energy techniques to the tibialis anterior, peroneal muscles, and foot intrinsics improve proprioception, balance load distribution, and reduce compensatory stress on the sesamoid complex

Region

Plantar arch and medial foot

Technique

Soft Tissue

Rationale

Myofascial release techniques address fascial restrictions and trigger points in the plantar intrinsics and abductor hallucis, reducing tension on the sesamoid-bearing structures

Region

Lower leg and foot lymphatics

Technique

Lymphatic

Rationale

Lymphatic drainage techniques promote resolution of local inflammation and swelling, enhancing healing of the inflamed sesamoid tissues and surrounding structures

Add-On Approaches

Chinese Medicine

Acupuncture to local points (Yinbai LV1, Dadun LV1) and distal points combined with moxibustion can reduce inflammation and improve Qi circulation to the affected forefoot region

Chiropractic

Foot manipulation and adjustments to correct first ray dysfunction, combined with orthotics prescription to address biomechanical contributors and offload sesamoid pressure

Physiotherapy

Progressive strengthening of foot intrinsics, proprioceptive training, gait retraining to reduce forefoot loading, and agility exercises for graduated return to sport

Remedial Massage

Deep tissue massage to calf, plantar surface, and foot muscles to reduce tension, improve circulation, and address compensatory patterns in the lower kinetic chain

Rehabilitation Exercises

Great Toe Dorsiflexion and Plantarflexion - Active

Range of MotionBeginner

Plantar Fascia Stretch - Standing with Towel Roll

StretchingBeginner

Calf Stretch - Lunge Position

StretchingBeginner

Foot Intrinsic Exercises - Towel Scrunching

StrengtheningBeginner

Great Toe Flexion Against Resistance - Seated

StrengtheningIntermediate

Single-Leg Stance on Firm Surface

StrengtheningIntermediate

Proprioceptive Training - Single-Leg Balance on Foam

BalanceIntermediate

Foot Arch Activation - Short Foot Exercise

PosturalBeginner

Calf Raises - Double Leg to Single Leg Progression

StrengtheningIntermediate

Ankle Circles and Mobilization - Seated

Range of MotionBeginner

Heel-Toe Walking - Forward and Backward

BalanceIntermediate

Pool Walking or Swimming - Low-Impact Conditioning

CardiovascularBeginner

Referral Criteria

  • •Suspected sesamoid fracture confirmed on imaging or clinical examination
  • •Symptoms persisting beyond 8-12 weeks despite appropriate conservative management
  • •Significant functional limitation affecting activities of daily living or quality of life
  • •Signs of avascular necrosis or degenerative changes on imaging
  • •Need for advanced imaging (MRI, bone scan) to confirm diagnosis
  • •Consideration of injection therapy or surgical intervention by orthopedic surgeon
  • •Concurrent inflammatory arthropathy or systemic disease contributing to symptoms
  • •Neurological symptoms or suspected nerve compression requiring specialist assessment