Populations and Risk Factors
- Athletes in contact sports (football, soccer, rugby)
- Individuals sustaining eversion injuries during jumping or landing
- Higher risk of DVT and compartment syndrome during post-fracture immobilization
- Older adults with osteoporosis at risk for fragility fracture patterns
- Severe cases may involve fracture of the posterior tibial margin (trimalleolar fracture)
Causes and Pathophysiology
- Eversion mechanism: Forcible eversion drives the talus laterally against the distal fibula, fracturing it. Simultaneously, the strong deltoid ligament either tears or avulses the medial malleolus rather than tearing (bone fails before ligament)
- Posterior margin involvement: Severe forces can also fracture the posterior tibial margin, creating a trimalleolar fracture with greater instability
- Post-immobilization consequences: 6-18 weeks of casting leads to ankle joint capsule adhesions, Achilles tendon shortening, calf muscle atrophy, decreased accessory glide of the talus in the mortise, and loss of ankle ROM in all planes
- Complication risks: DVT from immobility, compartment syndrome from post-fracture swelling within a tight cast, CRPS (complex regional pain syndrome)
Signs and Symptoms
- Localized, sharp pain at the malleoli aggravated by weight-bearing
- Abnormal ankle mobility or visible deformity
- Rapid, significant swelling around the ankle joint line
- Exquisite point tenderness over both medial and lateral malleoli
- Ecchymosis tracking distally toward the foot
- Inability to bear weight immediately after injury
- Red flags: Signs of compartment syndrome (unrelenting pain, loss of distal pulses, tense swelling) — emergency referral; calf swelling, warmth, or positive Homan sign suggests DVT during immobilization — refer
CMTO Exam Relevance
- CMTO Appendix category A1 (MSK conditions)
- Essential tests: Ottawa Ankle Rules (clinical prediction rules for need for radiographic imaging — bone tenderness at the posterior edge or tip of malleoli)
- Post-cast assessment: ROM audit, joint play assessment (AP glide of talus in mortise), calf girth measurement for atrophy
- Red flags: compartment syndrome signs, suspected DVT during immobilization
Massage Therapy Considerations
- Acute phase: Locally contraindicated until medically stabilized
- During immobilization: Massage other body areas for compensatory patterns (hip, low back, contralateral leg). Lymphatic work to reduce swelling above and below the cast
- Post-immobilization: Restore joint play and ROM. Stretch inelastic scar tissue. Address calf muscle atrophy. Contrast baths to improve circulation and reduce stiffness
- Do not apply resistive or stretch forces beyond the fracture site until radiographic evidence of clinical union
- Referral trigger: Suspected ankle sprain not improving within days requires imaging to rule out fracture
Key Takeaways
- Pott fracture is a bimalleolar ankle fracture from forcible eversion. Ottawa Ankle Rules guide radiographic imaging decision
- Acute phase is locally contraindicated. During immobilization, treat compensatory patterns in the hip and low back with lymphatic work for swelling
- Post-immobilization focus: restore joint play (AP glide of talus) and ROM, stretch scar tissue, address calf atrophy
- Do not apply resistive or stretch forces beyond the fracture site until radiographic evidence confirms clinical union
- Red flags include compartment syndrome (unrelenting pain, loss of distal pulses) and DVT during immobilization