Ankle Fractures in Diabetics

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Prevalence of Ankle Fractures

• Incidence ranges from 4.2 to 18.7 per 10,000 person-years.

• Account for approximately 9% of fractures treated in orthopaedic trauma.

• Demonstrate a bimodal age distribution:

  • Higher incidence in young men

  • Increased incidence in adults older than 50 years

• Approximately 25% to 50% of ankle fractures require surgical intervention.

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Increased Risk and Challenges with Age and Diabetes

• Risk of ankle fractures increases significantly after the age of 50 years.

• Diabetic patients sustain higher complication rates following ankle fractures, irrespective of whether treatment is surgical or nonsurgical.

• Complication risk is particularly elevated in patients with:

  • Diabetic neuropathy

  • Peripheral vascular disease

• Common complications include:

  • Failure of fixation

  • Malunion

  • Wound infection

  • Limb loss

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Physiological Considerations in Diabetes

• Diabetes is frequently associated with comorbidities such as smoking, obesity, hypertension, and chronic kidney disease, all of which increase complication risk.

• Diabetes mellitus is a metabolic disorder characterized by chronic hyperglycemia and includes:

  • Type 1 diabetes

  • Type 2 diabetes, which accounts for approximately 90% of cases

• Persistent hyperglycemia causes tissue damage through:

  • Protein glycosylation

  • Formation of advanced glycation end products

  • Accumulation of intracellular sorbitol and other polyols

  • Increased oxidative stress

• These mechanisms lead to:

  • Neuropathy

  • Microangiopathy

  • Macroangiopathy

  • Immune dysfunction

• These physiological changes significantly increase complication rates in ankle fractures.

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Glucose Control and Surgical Risk

• Insulin dependence in type 2 diabetes is commonly used as a marker of disease severity and glycemic control.

• Insulin-dependent diabetes is associated with higher complication rates following ankle fracture surgery compared with non-insulin-dependent diabetes.

• Studies demonstrate higher rates of:

  • Amputation

  • Infection

  • Reoperation

  • Readmission

  • Surgical site infection

  • Osteomyelitis

  • Wound dehiscence

  • Bleeding

  • Sepsis

  • Mortality

• Hemoglobin A1c reflects average blood glucose levels over the preceding 3 months.

• Hemoglobin A1c values greater than 6.5% are associated with increased complication rates.

• No definitive threshold value has been established, but rising levels correlate with poorer radiographic and functional outcomes.

• In patients with severely elevated hemoglobin A1c or uncontrolled glucose levels, a multidisciplinary perioperative approach involving endocrinology and anesthesia is essential.

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Diabetic Neuropathy

• Diabetic peripheral neuropathy significantly increases complication risk in ankle fractures.

• Prevalence:

  • Approximately 21% within 5 years of diabetes onset

  • Up to 41% within 10 years

• Loss of protective sensation increases ulcer risk:

  • 3-fold with reduced sensation

  • 9-fold with absent sensation

• Loss of vibratory sensation is a sensitive indicator of neuropathy and increases ulcer risk by 7-fold.

• Autonomic neuropathy occurs in 30% to 50% of patients with sensory neuropathy and leads to:

  • Dry, cracked skin

  • Increased ulcer risk by approximately 4-fold

• Diagnostic evaluation:

  • Nerve conduction studies are the gold standard

  • Common clinical screening tools include Semmes–Weinstein monofilament testing and a 128-hertz tuning fork

• Routine neuropathy screening is essential in diabetic patients with ankle fractures.

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Diabetic Vasculopathy

• Diabetic patients have increased risk of both macrovascular and microvascular disease.

• Peripheral arterial disease is approximately twice as common in diabetics compared with the general population.

• Reported prevalence ranges from 20% to 50%.

• Microvascular dysfunction is influenced by impaired neurovascular and neurogenic control.

• Vascular assessment includes:

  • Ankle brachial index

  • Toe brachial index

• Both tests should be used together, as calcified, noncompressible arteries may falsely elevate ankle brachial index values.

• Suspected vascular compromise warrants vascular surgery consultation to assess healing potential and the need for revascularization.

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Delayed Healing in Diabetes

• Diabetes adversely affects both soft-tissue and bone healing.

• Experimental studies demonstrate:

  • Reduced collagen synthesis

  • Weakened callus formation

• Chronic hyperglycemia and advanced glycation end products impair osteoblast differentiation.

• Diabetes promotes a chronic inflammatory state with elevated proinflammatory cytokines, leading to:

  • Impaired granulation tissue formation

  • Reduced wound tensile strength

• These host-related factors complicate ankle fracture management in diabetic patients.

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Nonoperative Management

• There are no randomized or prospective studies evaluating nonoperative versus operative treatment of ankle fractures in diabetic patients.

• Available evidence is limited to retrospective studies.

Evidence from Retrospective Studies

• Lovy et al. evaluated displaced ankle fractures in diabetic patients:

  • Nonoperative group: 75% complication rate

  • Complications included loss of reduction, Charcot arthropathy, cast-related ulcers, reoperation, and deep infection

  • Operative group: 12.5% complication rate

  • Operative fixation after failed nonoperative care resulted in a 100% complication rate

Recommendations

• Unstable ankle fractures in diabetic patients should generally be treated operatively with anatomic reduction and rigid fixation.

• Stable fractures may be treated nonoperatively with close monitoring for skin breakdown and ulceration.

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Operative Techniques and Considerations

Open Reduction and Internal Fixation

• Reported complication rates in diabetic patients range from 14% to 36%.

• Infection rates range from 12% to 36%, with deep infection rates of 7% to 10%.

• Increased complication risk is associated with absent pedal pulses and peripheral vascular disease.

• Functional outcomes may be inferior in diabetic patients compared with nondiabetic patients.

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Supplemental Stabilization

• Augmentation with transarticular or trans-calcaneal fixation may improve construct stability.

• Supplemental fixation has been associated with reduced complication rates in select patient populations.

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Fixation Strategies

• Locking plates

• Posterior antiglide plates

• Direct fixation of posterior malleolar fragments

• Trans-syndesmotic fixation

• Increased construct stiffness and fixation density are often required to compensate for poor bone quality and delayed healing.

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Minimally Invasive Surgical Techniques

• Diabetic patients are at increased risk of wound complications, encouraging the use of less invasive approaches.

Techniques Include

1. Minimally invasive plate fixation with smaller incisions and reduced soft-tissue disruption

2. Percutaneous cannulated screw fixation

3. Intramedullary fibular nail fixation for rotational ankle injuries

4. Primary arthrodesis using tibiotalocalcaneal nails as a salvage procedure, with or without formal joint preparation

• These techniques offer improved construct rigidity with less soft-tissue compromise.

• Arthroscopy may be used to assess cartilage injury and confirm fracture reduction.

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Additional Considerations

• Equinus contracture should be evaluated in diabetic patients.

• Gastrocnemius or Achilles tendon lengthening may be required to reduce forefoot or midfoot ulcer risk.

Wound Care and Infection Prevention

• Vacuum-assisted closure has been shown to reduce surgical site infection rates compared with standard moist wound care.

• Practical limitations include difficulty with application, interference with immobilization, and need for specialized nursing care.

• Topical vancomycin powder applied intraoperatively has been shown to reduce deep infection rates and may be considered in high-risk patients.

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Postoperative Care

• Delayed bone healing is common, necessitating prolonged protected weight bearing.

• Immobilization for up to 8 weeks has traditionally been recommended.

• Recent evidence supports earlier protected weight bearing when stable fixation and load-sharing devices are used.

• Prolonged non-weight bearing may result in significant morbidity, especially in patients unable to use assistive devices.

• Optimal rehabilitation protocols remain an area for future research.

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Complications

• Diabetic patients with ankle fractures have significantly higher risks of:

  • Infection

  • Nonunion

  • Malunion

  • Revision surgery

  • Amputation

• Infection risk is increased 4.7-fold in diabetes and further amplified by neuropathy.

• Complicated diabetes carries:

  • 6-fold higher infection risk compared with uncomplicated diabetes

  • 10-fold higher risk compared with nondiabetic patients

• Management often requires a multidisciplinary team including orthopaedics, endocrinology, infectious disease, vascular surgery, and wound care specialists.

• Severe cases may require staged reconstruction or amputation.

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Conclusion

• Operative treatment is generally recommended for unstable ankle fractures in diabetic patients.

• Enhanced fixation strategies or intramedullary fixation should be considered in patients with complicated diabetes.

• Thorough counseling of patients and families is essential to explain the elevated risk of complications, including limb loss