DIABETIC FOOT ULCER

1. Diabetic foot ulcer DR SUREIN PRASAD

2. Definition
Etiology and risk factors
Pathophysiology
Clinical Presentation
Classification
Workup
Management

3. Definition
Diabetic foot ulcer
A non healing or poorly healing, break in the skin, below the ankle in an
individual with diabetes, critical in the natural history of the diabetic
foot.

4. Risk factors
Neuropathy
Peripheral
Vascular
Disease
Abnormal Foot
Pressures
Hyperglycaemia
Trauma Foot Deformity
Limited Joint
Mobility
Previous
Ulceration
/Amputation
Poor Vision Old Age
Duration of
Diabetes

5. Etiology
The three pathogenetic mechanisms involved in diabetic foot
complications are
neuropathy
Angiopathy
/ischaemia
infection

6. Pathophysiology

7. Clinical presentation
History
• Onset and progression of ulcer
• Constitutional symptoms- fever
Physical examination
• Ulcer
• Neuropathic foot
• The neuropathic foot is warm and well perfused with palpable pulses; sweating is
diminished, and the skin may be dry and prone to fissuring.
• Neuroischemic foot
• The neuroischaemic foot is a cool, pulseless foot; the skin is thin, shiny, and without hair.
There is also atrophy of the subcutaneous tissue, and intermittent claudication and rest pain
may be absent because of neuropathy
• Infected

8. Left: Neuropathic foot with plantar
ulcer surrounded by callus. Right:
Ulcer over medial aspect of first
metatarsophalangeal joint of
neuroischaemic foot

9. Ulcer examination
• Location, size, depth, margins, colour, odour, base, floor
• type of discharge
• attempts made to express pus
• type of ulcer (neuropathic, ischemic or neuro-ischemic) needs to be
determined.
• probed to look for extension into bone, sinus tract, joint and tendon
sheath. Probe hitting bone signifies possible underlying osteomyelitis.
When bone is exposed, the patient is assumed to have osteomyelitis
until proven otherwise.

10. Vascular
• Pulses (dorsalis pedis, posterior tibial, popliteal, femoral)
• Capillary return (normal < 2 seconds)
• Colour changes: Cyanosis, erythema
• Changes of ischemia: Skin atrophy; nail atrophy, abnormal wrinkling,
diminished pedal hair

11. Neurological
• Vibration perception: Tuning fork 128 Hz
• Pressure & Touch: Cotton wool (light), Monofilament (5.07) 10gm
(Semmes Weinstein)
• Pain: Pinprick, using sharp and blunt tool ( e.g. Neurotip)
• Temperature perception: hot and cold

12. Monofilament test: testing sites and
application. The nine plantar sites are
the distal great toe; third toe; fifth toe;
first, third, and fifth metatarsal heads;
medial foot, lateral foot, and heel; and
one dorsal site

13. Musculoskeletal deformities
• Attitude and posture of lower extremities and foot
• Orthopedic deformities – Hammertoes / Bunions / Charcot
deformities / amputations / prominent metatarsal heads
• Limited joint mobility – active and passive movements
• Tendo - Achilles contractures

14. Evaluation of the skin and nails of the foot
• Skin appearance: color, texture, turgor, quality, and dry skin
• Calluses, heel fissures, cracking of skin due to reduced sweating
inautonomic neuropathy
• Nail appearance: Onychomycosis, dystrophic, atrophy,
hypertrophy,paronychia
• Presence of hair
• Ulceration, gangrene, infection
• Interdigital lesions
• Tinea pedis

15. Classification
Wagner’s
University
of texas

17. Stages
Stage A: No infection or ischemia
Stage B: Infection present
Stage C: Ischemia present
Stage D: Infection and ischemia
present
Grading
Grade 0: Epithelialized wound
Grade 1: Superficial wound
Grade 2: Wound penetrates to
tendon or capsule
Grade 3: Wound penetrates to
bone or joint

18. Workup
Biochemical
• Fasting or random blood sugar (FBS, RBS)
• Glycohemoglobin (HbA1C)
• Full blood count (FBC)
• Erythrocyte sedimentation rates (ESR)
• CRP
• Wound and blood cultures(C&S)
Imaging
Vascular investigations
Neurological investigations
Assessment of plantar foot pressure

19. Imaging
• Plain radiograph of the foot
• AP, lateral, and oblique of foot and ankle
• MRI
• best for differentiating abscess from soft tissue swelling
• Bone scan
•useful to differentiate between
•soft tissue infection
•osteomyelitis
•Charcot arthropathy

20. Vascular
to evaluate the extent of occlusive vascular disease and in the assessment of healing potential
especially when clinical examination suggests lower extremity ischaemia
• Doppler segmental artery pressures
• Ankle-brachial indices (ABI)
• Normal value 1.1, <0.9 abnormal
• Toe pressure measurements
• In general, 85%-100% of foot lesions will heal when toe pressures are >40mmHg and less than 10% will heal
if<20mmHg
• Transcutaneous oxygen tension (TcPO2)
• <10mmHg correlates with non-healing, >30mmHg correlates with healing
Any abnormal results of the above investigations in the presence of a non-healing foot ulcer warrant
a vascular assessment. Determination of distal run-off and perfusion can be assessed by
arteriography, digital subtraction angiography (DSA)or magnetic resonance angiography (MRA)

21. Left: Hand held Doppler used with sphygmomanometer to
measure ankle systolic pressure. Right: Doppler waveform from
normal foot showing normal triphasic pattern (top) and from
neuroischaemic foot showing damped pattern (bottom)

23. Assessment of plantar foot pressure
High plantar foot pressures have been identified as a significant risk
factor for ulceration.
Measurements are to be done regularly as important changes in the
distribution and level of pressures under diabetic neuropathic feet
occur during a relatively short period.
Harris mat and computer techniques allow qualitative and quantitative
measurements of plantar foot pressures respectively. They are able to
identify potential areas of ulceration

25. Management
• Operative
• Debridement
• Surgical management to reduce or remove bony prominences and/or improve soft
tissue cover
• Non-operative
• Wound care
• Reduction of plantar pressure
• Others
• Infection
• Vascular management of ischemia
• Medical management of comorbids
• Reduce risk of recurrence

26. Debridement
• Surgical debridement
• Indications : grade 3 or greater ulcers
• Infected wound

27. Wound care
goals of wound care and dressings
• provide moist environment
• absorb exudate
• act as a barrier
• off-load pressure at ulcer

29. Reduction of plantar pressure (offloading)
• involves reducing the pressure to the diabetic
foot ulcer, thus reducing the trauma to the
ulcer and allowing it to heal.
• Methods: (pics please)
• Total non-weight bearing.
• Total contact cast (GOLD STANDARD)
• Foot cast or boots
• Removable walking braces with rocker bottom soles
• Total contact orthoses – custom walking braces
• Patellar tendon bearing braces
• Half shoe or wedge shoes
• Healing sandal – surgical shoe with molded plastizote
insole
• Accommodative dressing: felt, foam, felted-foam, etc
• Shoe cutouts (toe box, medial, lateral or dorsal
pressure points).
• Assistive devices: crutches, walker, cane, etc.

30. Vascular management of ischemia
Vascular supply to the affected limb should be assessed earlyand if
impaired, vascular reconstruction surgery (if feasible) should be
performed prior to definitive surgical management

31. Surgical management to reduce or remove bony
prominences
• A structurally deformed foot may give rise to high-pressure areas
causing ulcers that do not heal with off loading treatment or
therapeutic footwear.
• Such deformities are treated surgically to effect healing and to
prevent recurrence.
• Examples are correction of hammertoes, excision of exostoses,
bunions and tendo-achilles lengthening

32. Diabetic foot
infection

33. Local signs of wound infection
• Granulation tissue becomes increasingly
friable
• Base of the ulcer becomes moist and
changes from healthy pink granulations to
yellowish or grey tissue
• Discharge changes from clear to purulent
• Unpleasant odour is present

34. Non limb threatening
• These patients are initially managed as outpatients and hospitalized only
when no improvement is noted after 48-72 hours or the condition
deteriorates.
• Antibiotic therapy is commenced and if ulcer is present. The ulcer is
cleansed and debrided.
• Ulcer management is then followed as previously outlined.
• Correction of hyperglycemia and stabilization of other co-morbidities are
carried out simultaneously.
• The response to treatment is then re-evaluated after 48-72 hoursand
necessary action may need to be taken.
• Aspects of prevention, patient education, podiatric care and orthotic
treatment are also carried out.

35. Limb threatening
• Surgical treatment
• debridement of wounds, incision & drainage of abscesses, necrotising fascitis
and amputations of gangrenous tissues
• tissues taken deep from the wound are sent for aerobic and anaerobic
cultures
• osteomyelitic bones are removed and sent for microbiological culture and
histology
• Wound care
• Antibiotics
• Medical management of comorbidities

36. Antibiotic
• Start with an empiric regime that covers important and common
pathogens, taking into account infection severity, while awaiting
culture results
• The empiric therapy for severe infections should be broad-spectrum
and given intravenously whereas minor infections can be treated with
narrower spectrum antibiotics.

37. • Mild and moderate non-limb threatening infections are usually
monomicrobial, with Staph. Aureus, Staph. Epidermidis and
Streptococci being the most common infecting organisms.
• These patients are given gram- positive coverage but keeping in mind
gram- negative organisms may also be involved.

38. • Severe limb and life threatening infections are poly-microbial in nature,
which includes gram-positive and negative organisms, anaerobic organisms
and enterococci.
• Pseudomonas species are often isolated from wounds that have been soaked or
treated with wet dressings.
• Enterococci are commonly cultured from patients who have previously received
cephalosporin therapy.
• Anaerobes are found in wounds with necrosis, deep tissue involvement or a feculent
odour.
• MRSA are often acquired during a previous hospitalization.
• Empiric intravenous broad- spectrum antibiotics therapy in these patients
should cover common isolates of the above organisms and then adjusted
according to culture and sensitivity results. Recurrent infections, despite
ongoing antibiotic therapy, should have repeated deep tissue cultures done
to exclude super infection. If MRSA is isolated, this should be treated early
and appropriately.

39. Duration of antibiotic treatment –
• 1-2 weeks course for mild to moderate infections
• more than 2 weeks for more serious infections
• For osteomyelitis, if infected bone is not removed, antibiotics are
given for 6 - 8weeks, depending on culture results
• If all infected bone is removed, a shorter course (1-2 weeks) of
antibiotics, as for soft tissue infection, maybe adequate.

40. • Maintaining effectiveness of therapy through parameters including, the
patient’s
• clinical response,
• temperature,
• WBC count,
• ESR
• other inflammatory markers,
• blood sugar control
• other metabolic parameters,
• signs of wound healing and inflammation.
• If there is vascular impairment, the antibiotics may not be able to reach the
infected site. Hence, vascular reconstructive procedures may have to be
undertaken to improve blood flow to infected tissues.

42. Prevention
• Education
• Foot care
• Therapeutic shoes
• Reduction of plantar pressure
• Surgery
• Multidisciplinary Team Approach

43. References
• CPG Management of Diabetic Foot
• https://www.orthobullets.com/foot-and-ankle/7046/diabetic-foot-
ulcers
• https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1370976/
• https://www.bmj.com/content/359/bmj.j5064