comprehensive management of the diabetic foot...comprehensive management of the diabetic foot collin...
TRANSCRIPT
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Comprehensive Management of the Diabetic Foot
Collin E. Pehde, DPM, FACFAS
Assistant Professor
Des Moines University
College of Podiatric Medicine and Surgery
DMU Foot and Ankle Clinic
Iowa Affiliate WOCN Society
Fall Conference
September 13, 2019
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Lecture Objectives
• Understand the comprehensive care approach to the Diabetic Foot
• Understand the orthoplastics approach to treat diabetic foot ulcers
• Understand treatment principles for treating foot and ankle Charcot deformity.
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Comprehensive Management of The Diabetic Foot
• Maintenance Foot Care
• Wound Care
• Limb Salvage
– Orthoplastics
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Dreaded Complications
of Diabetes
The Big Three
• Blindness
• Kidney Failure
• Foot and Leg Amputation
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The Bad News
• Amputations usually start out as preventable, easy to treat problems– Calluses, ingrown toenails
• Once a diabetic has a partial or complete foot amputation, he or she is at high risk for further breakdown
• Rehabilitation of an BKA or AKA with a prosthetic in a diabetic can be extremely difficult
• Below knee and above knee amputations put significant stress on the heart and lungs
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Impact of Ulcerations
“Foot ulceration is the most common single precursor to lower extremity amputations among persons with diabetes.”
JFAS, Diabetic Foot Disorders, Clinical Practice Guidelines
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The Diabetic Foot
• More than 30 million Americans are living with diabetes, and more than 84 million US adults have prediabetes.
• More than 60% of leg and foot amputations not related to accidents and injuries are performed on people with diabetes.
November 14, 2018
Content source: Centers for Disease Control and
Prevention
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Diabetic Foot Statistics
• With appropriate therapy many DFUs will heal and avoid the need for some level of amputation
• Recurrence of DFUs in patients is common
– 40% within 1 year
– 60% within 3 years
– 65% within 5 years
Armstrong et al, “Diabetic Foot Ulcers and Their Recurrence”, NEJM, June 15, 2017, pp2367 - 2375
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Diabetic Foot Statistics
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THE GOOD NEWS
Diabetic Foot
Problems are readily treatable and very
preventable!
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Realistic Diabetic Foot Care Model
• Recognize that diabetic foot issues range from the simple to the complex
• Need to be able to manage complex foot and ankle conditions in complex medical patients
• Recurrence of diabetic foot ulcers is common but not a sign of abject failure
• The high risk diabetic foot needs frequent monitoring
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Ideal Diabetic Foot Management Model “The Diabetic Foot Zone”
No diabetic foot
complications
Appropriate Foot Care
Appropriate Shoes and
Bracing
Regular Medical
Professional Foot
Checks
Management of mild to
moderate complications
Mild to moderate Infection
Ulcer Management
Peripheral Arterial Disease
Stable Charcot Deformity
Management of limb
threatening foot and
ankle conditions
Severe soft tissue and
osseous infections
Critical Limb Ischemia
Unstable Charcot
Deformity
Patient in DFU Remission
How many days ulcer free ?
Goal is to avoid Diabetic Foot Complications
Goal is to transition back to complication
free state as efficiently as possible
$$$ $$$
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The Diabetic Foot Green Zone
• Patient Education– Foot-specific individualized patient education is the most
important element of a comprehensive diabetic foot program.
• Prophylactic skin and nail care– Prevention of ingrown toenails and ulcers caused by thickened
toenail
– Prevent callus buildup
• Protective footwear– Protects feet from undo pressure and sheer forces
• Once a problem arises, the patient is instructed to seek medical attention immediately.– Dealing with problems early on is much easier
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Palliative Care
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Medical Care
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Appropriate Callus Care
YES
•Non-medicated Corn Pads
•Pumice Stone
•Moisturizing lotion
•Well fitting Shoes and Inserts
•Professional debridement
•Surgery to fix deformities
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Avoid Self Sharp Debridement
NO
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NO
Medicated Corn Pads
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Luckily, healed uneventfully
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Heating Pads and Diabetics Don’t Mix
• Be Very Cautious!!!
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Diabetic Male Fell Asleep with Heating Pad on his foot
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• Required multiple surgeries to save his foot.
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Shoes and Inserts• Very, very, very important.
• Different shoe brands do nothave universal sizes
• Feet should be measured by a professional with the Brannock device
• Shoes and inserts should be replaced on an annual basis
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Foot Care Study in Diabetic Patients
• Out of 23 male and female diabetic patients, only 3 had shoes that were the correct size.
• Those 3 patients had been measured and fitted with diabetic shoes by a health professional
Neil et al, Nephrology Nursing Journal, Feb 2003
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• Accommodative inserts and shoes should be dispensed by a professional
• Shoes and inserts protect feet from high pressures and shearing forces
• Accommodate foot deformities
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Keys to Prevention in the Green Zone
• Education
• Checking Feet Daily
• Cleaning feet daily
• Moisturizing Feet Daily
• Care for nails and calluses in a safe appropriate manner. If you cannot take care of them, see a health care professional on a regular basis
• Report ANY changes, even if it seems minor, to your doctor immediately
• Wear appropriate size shoes and accommodative inserts or bracing as needed
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The Diabetic Foot
• Yellow Zone Red Zone Management
• Requires more advanced care
• May require hospital inpatient management
• May require surgical intervention
• If condition worsens, patient becomes more at risk for
needing a more proximal leg amputation
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The Diabetic Foot Yellow Zone Management
Management of mild to moderate diabetic foot and ankle complications
• Mild to moderate Infection
• Ulcer Management
• Peripheral Arterial Disease
• Stable Charcot Deformity
• Foot and ankle deformity
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The Diabetic Foot Red Zone Management
• Management of limb threatening foot and ankle conditions
• Severe soft tissue and osseous infections
• Critical Limb Ischemia
• Unstable Charcot Deformity
• Foot and Ankle Deformity
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“Charcot foot is a progressive condition characterized by joint dislocation, pathological fractures, and severe destruction of the pedal architecture.”
Charcot Foot and Ankle Definition
JFAS, Supplement 2000, Diabetic Foot Disorders: A Clinical Practice Guideline, p S39
Complex foot and ankle trauma in complex patients.
Depending on
individual case:
Surgical or non surgical
care
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• History
– Neuropathy – known or unknown by patient
– Trauma – common but may not be realized by patient
• Clinical
– Red, hot swollen foot
– Pain is typically minor for the amount of injury
• Imaging
– Radiographs are typically all that is needed
– MRI – can be useful in early stages for increased inflammation
– CT and bone scan
Diagnosis
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AO Principles for Foot and Ankle Trauma
• Accurate anatomical reduction
• Rigid internal compression fixation
• Atraumatic surgical technique
• Early pain free mobilization
• Difficult to adhere to these principles with surgical Charcot management
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Treatment of Charcot Deformity
• Treatment is “reactive”• Do not have the ability to screen or
predict who or when a charcot event will occur
• The goal of treatment whether it be surgical or non-surgical is to achieve a stable and plantigrade foot that enables functional ambulation with footwear and bracing or a stable limb for transfers.
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When to perform Surgery ?
• Historically conservative care was instituted in acute stages and surgery was considered only during the quiescent stages
• Currently, much controversy exists about performing surgery earlier to stabilize more acute stages of Charcot arthropathy
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Common Reasons to Operate in the Literature
• Recalcitrant ulcers despite appropriate offloading trial
• Acute fractures and dislocations in the hindfoot and ankle
• Unstable and painful foot and ankle deformity
• Resecting infected bone in cases of osteomyelitis
• Achilles tendon lengthening to mitigate midfoot forces
Rogers et al, “The Charcot Foot in Diabetes” Diabetes Care, Vol 34, September 2011,
2123- 2129
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Surgical Treatment
• In general, perform more simple procedures to more complex
• Correction of equinus deformity
• Exostectomies - not typical for hindfoot and ankle
– When foot is structurally stable and bony prominence is underlying etiology
• Arthrodesis and Osteotomy procedures– When architecture of foot and ankle is not structurally
stable
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Roger’s Charcot foot classification system
Rogers LC, Bevilacqua NJ. The diagnosis of Charcot foot. Clinics in Podiatric Medicine
and Surgery, 2008;25: 43-51
• Based on location and stage
• Location
• Forefoot to Rearfoot/Ankle
• Stage
• Charcot with and without
deformity
• Charcot deformity with
ulcer
• Charcot deformity with
osteomyeltis
Predictor of Extremity amputation
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Diabetic Ulcer Management
1. Vascular Supply
2. Debridement
3. Infection
4. Offloading and Deformity Correction
5. Wound Management
6. Wound Closure
7. Management of medical comorbidities
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Vascular
History and Physical Exam
• Intermittent Claudication• Rest Pain• Gangrene
• Palpable Pulses• Cold extremity• Dependent Rubor• Absent hair growth• Capillary Refill Time• Gangrene
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Non-invasive Vascular Exams
• Doppler Ultrasound
• Segmental Blood Pressure
• Ankle Brachial Index
• Toe Blood Pressure
• Plethysmography
• Transcutaneous Oxygen Pressure
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Endovascular Surgical
Need to be prudent with vascular intervention if warranted
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Wound debridement
• Must remove necrotic tissue to expose healthy tissue
• Reduce bacterial burden
• 4 basic types of debridement :autolytic
enzymatic
biotherapy
mechanical
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Clinical Guidelines for Treatment Diabetic Foot Infections
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Diabetic Foot Infections
• Swab – try to avoid swabs if possible
– Should not be superficial culture of ulcer base
– Should be deep swab
– Collection of purulence
• Deep tissue
– Best indication is deep tissue culture
• Bone
– If suspected, bone biopsy for culture and histology
Cultures
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Treatment of Diabetic Foot Infections
General Treatment
• Eradicate bacterial load with incision and drainage and debridement
– This step must be done regardless of vascular supply
– Must remove ALL Non-Viable Bone and Soft tissue. Worry about closure of wound when infection eradicated.
• Start with empirical antibiotics and focus therapy based on reliable deep cultures
– Length of antibiotics depends on severity of infection, response of infection to treatment (typically 2 to 8 weeks)
– Oral
– Intravenous • In-patient • Out-patient (PICC line, Central line)
– Antibiotic beads
• Closure of wounds
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External Off loading
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Wound Management
• 1000’s of different wound care products
• Many skin substitute grafts
• Daunting task
• My approach
– If it is wet keep dry and if it is dry make it wet
– Economical for the patient
– Have an ultimate plan for closure of the wound and update patient often on progress and need for change if wound stalls
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Negative Pressure Wound Therapy
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Skin Equivalents Many options now available
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Secondary Intention
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How to Approach ?
• Vascular supply is optimized
• Infection Controlled
• Wound debrided
• Good wound management
• Foot offloaded but not healing due to complex foot deformity ?
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Orthoplastics Definition
“The principles and practice of both orthopedic and plastic surgery applied to a clinical problem either by a single provider or team of providers working in concert for the benefit of the patient.” L. Scott Levin, MD
L. Scott Levin, “The Reconstructive Ladder: An Orthoplastic Approach” Orthopedic Clinics
of North America, July 1993, pp393 – 409
Oren Lerman, et al “The Respective Roles of Plastic and Orthopedic Surgery in Limb Salvage”
Plastic and Reconstructive Surgery, January Supplement 2011, pp215S – 227S
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Orthoplastics and the Diabetic Foot Ulcer
• Makes sense to concomitantly manage the soft tissue and musculoskeletal deficiencies
Soft Tissue Reconstructive Ladder
Musculoskeletal Reconstructive Ladder
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My Approach to the Soft Tissue Reconstructive Ladder
1. Secondary Intention• Skin Equivalent Grafts • Topical Growth Factors • Negative Pressure Wound Therapy
2. Primary Closure3. Split thickness or full thickness skin graft4. Local random flaps
• Rotational, V to Y, Translational
5. Regional axial flaps• Lateral calcaneal artery, medial plantar artery, intrinsic muscle foot, • Perforator
6. Distant axial flaps • Reverse sural artery flap, peroneus brevis, hemisoleus muscle flaps
*Hyperbaric Oxygen Therapy – adjunctive treatment when indicated during all phases of the reconstructive ladder
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Musculoskeletal Reconstructive Ladder
• System to guide treatment of musculoskeletal factors impeding the healing of diabetic foot ulcers.
• Need to consider:
– Bone
– Joint
– Tendon and ligament
• Treatment can range from the simple to complex and can involve only one component or any combination of the foot and ankle musculoskeletal system
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Musculoskeletal Reconstructive Ladder
Common musculoskeletal conditions impeding diabetic foot ulcer healing • Prominent bone
• Bone deformity
• Osteomyelitis
• Joint deformity
• Joint contracture
• Joint instability
• Septic Joint
• Tendon and ligament imbalance
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Musculoskeletal Reconstructive Ladder
Bone
1. Simple ostectomy
2. Resection
1. Partial
2. Complete
3. Osteotomy
4. Bone grafting
5. Bone transport
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The Diabetic Foot Yellow Zone Management
Case Examples
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Contracted hammertoe with distal
3rd toe ulcer
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55 year old diabetic 2nd toe osteomyelitis
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Limited 1st MPJ ROM
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56 year old Type II diabetic Male
• 5th ray resection
• Transfer ulcer to the 4th
metatarsal head
• Present for over 3 months despite comprehensive wound management and offloading
• No signs of deep bone infection
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3 weeks
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Charcot 4th metatarsal base dislocation with ulcer
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Local Rotatation Flap Closure
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The Diabetic Foot Red Zone Management
Case Examples
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40 year old diabetic male with a wound in his 1st interspace
•5 day history of swelling, drainage and erythema in the 1st innerspace after stepping on a roofing nail at work•Worsening symptoms of malaise and pain in forefoot •WBC -17.00•Temp – 100 F•Xrays – negative for gas or bone destruction
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Limb Threatening Deep Abscess
Treatment•Admitted to hospital•IV Unasyn •I&D performed that day•Deep cultures taken•2 weeks of IV antibiotics
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Deep Abscess
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Deep Abscess
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69 year old diabetic female with Left Ankle Fracture
• Cardiac arrhythmia lead to her fainting and sustained left displaced fibula fracture.
• Admitted to hospital and pacemaker placed.
• Skin quality poor over distal lateral ankle
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59 year old diabetic male with septic charcot midfoot fracture dislocation
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• Required radical resection of the midfoot
• Subsequently, even though with Charcot deformity required LE arterial endarectomyto optimize blood flow
• IV antibiotics
• Choparts amputation with subtalar joint and ankle fusion
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89 year old diabetic male with a necrotizing infection to lower
leg
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50 year old diabetic male with charcotrockerbottom deformity
• Treated with multiple surgical debridements of the lateral plantar cuboid and 5th ray for infections.
• Lead to PB dysfunction and complex rockerbottom and varus deformity
• Non-healing wound despite aggressive wound care and non-surgical offloading
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60 year old ESRD diabetic male with heel ulcer
• Multiple debridements
• Friable granulation tissue with bone exposed
• Full resection of the achilles tendon leading to unstable hindfoot and ankle with calcaneal gait
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14 months Follow up
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Type II Diabetic male with ESRD on dialysis bit by domesticated cat 1 month prior on
the dorsal medial foot
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MRI
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• Direct extension to the Talonavicular joint
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TA
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• Charcot arthropathy
• 5th ray amputation
• Neuropathic lateral ankle ulcer
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• Unstable, unbraceable ankle varus
deformity
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Conclusion • The Diabetic Foot can require simple to complex
management
• Contemporary trend is to approach diabetic foot complications similar to a comprehensive cancer treatment model
• Diabetic foot complications are serious and have potential for significant morbidity and mortality for patients
• Treatment requires a team approach and much needs to be done to improve outcomes for patients
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THANK YOU !
THE DIABETIC FOOT ZONE