The Ankle: To Fuse or Not to Fuse? - AHN · 2017-04-14 · Ankle Osteotomies •goal is to...
Transcript of The Ankle: To Fuse or Not to Fuse? - AHN · 2017-04-14 · Ankle Osteotomies •goal is to...
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Surgical Management of Ankle
Arthritis James J Sferra, MD
Allegheny Health Network
Director, Division of Foot &Ankle
Orthopaedic Institute
Allegheny Orthopaedic Associates
The Ankle:
To Fuse or Not
to Fuse?
Conflict of Interest
I have the following potential COI:
• Consulting/Royalty payments directly
related to products discussed –
Orthohelix/Tornier and Acumed
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ANKLE ARTHRITIS,
ARTHRODESIS,
& ARTHROPLASTY
Cleveland Clinic AGH
Prevalence
• 5% of adults >70 yo have full thickness
defects in the ankle
• Medial compartment > than lateral
• Knee OA 12x > than ankle OA
• TKA 25x > TAA & ankle fusion combined
Primary OA is rare
Post-traumatic is most
common
RA is second most common
Prevalence
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Post-Traumatic
Rheumatoid Arthritis of Ankle
• Less common than
other joints (9%)
• Prevalence is related
to duration of illness
• Higher involvement
of ankle in JRA
Presentation
• Pain – worse with WB and activity
• Stiffness - worse in morning
• Decreased active and passive ROM
• Crepitation and synovitis
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Physical Exam
• Short strided antalgic gait
• Weakness
• Swelling
• Varus or Valgus
• Generalized tenderness over ankle joint
• Distinguish from subtalar pain
Radiographs
• AP/Lateral/Mortise
• Weight bearing is critical
• AP view distinguishes
varus/valgus from ankle
vs subtalar joint
• Radiographs don’t
correlate with clinical
function
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Advanced Studies
• Bone Scan of limited use
• CT scan to evaluate subtalar joint
involvement
• MRI to evaluate extent of AVN
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Surgical Options
• Arthroscopic Debridement
• Arthrodiastasis
• Realignment Osteotomies
• Allografts
• Ankle Arthrodesis
• Total Ankle Arthroplasty
Ankle Arthritis
• surgical options:
– “ Clean out ” (arthroscopic or
open)
– Osteotomy- tibial or calcaneal
– Arthrodesis
–Arthroplasty
Arthroscopy
• 3 main objectives:
– lavage
– debridement
– synovectomy
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Results with Arthroscopy: Ankle
• 23 OA ankles
• 17 / 23 ankles had significant
improvement in pain, swelling, limp and
activity level
• “ debridement for generalized
degenerative changes should be reserved
for those in the early stages of disease
with preserved range of motion ” Ogilvie-Harris, Arthroscopy 11, 1995
Results with Arthroscopy: Ankle
• 84 ankles with chronic pain
• multiple diagnoses
• worst results occurred in patients where the
diagnosis was OA ( good to fair results)
• “ arthroscopic debridement in the OA ankle
is beneficial but has limited long term
improvement ”
Demetriades et al, CORR 349, 1998
Results with Arthroscopy: Ankle
• proven useful for impinging osteophytes,
synovitis, adhesions, loose bodies and some
chondral defects
• not as useful for diffuse degenerative
disease
Cheng and Ferkel, CORR 349, 1998
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Ankle Osteotomies
• goal is to redistribute forces across ankle
• indicated only for asymmetric cartilage wear
most commonly seen in post-traumatic
• Takakura et al:
• 18 patients
• anterior and valgus low tibial osteotomy
• 6 excellent / 9 good / 3 fair / no poor
Takakura et al JBJS 77B, 1995
Total Ankle
Replacement
(TAR)
Ankle Fusion
• Gold standard
– First described in
1882 by Eduard
Albert
• Good pain relief
• Good patient
satisfaction
• If successful
initially no
further operations
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• Long period of immobilization
• ~10% nonunion rate • Malunion • Functional
impairment – Difficulty with
uneven ground, inclines, driving
• Premature arthritis in adjacent joints – Increased motion
and stress
• Retained motion
• Shorter period of immobilization
– Soft tissue healing only
• Better restores function and ROM
– May decrease adjacent joint DJD
– Theoretical
• Wound breakdown – Anterior approach
• Finite longevity of implants
• Less long term follow-up on newer generation implants
• Many surgeons have limited experience
• Failure may be catastrophic(BKA)
• Cost
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Arthritis of the Ankle
Surgical Treatment
Arthrodesis
• "Gold Standard"
• Indications - pain, deformity, loss of
ROM, failed arthrodesis, failed
arthroplasty
Ankle Arthrodesis
• Neutral Dorsiflexion
• 5 degrees valgus
• 10 degrees external rotation
• Talus posterior to the tibia
Internal Fixation
• Provides rigid
stabilization
• Lower incidence of
complications
• Better mobility
• Easier for patient
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Techniques
• Open
• Arthroscopic
• Mini-arthotomy
• Fibular onlay
• Fibular sparing-possible
future TAR
Ankle Fusion-”Kitchen Sink”
technique
• Fixation
–Screws
–External
Fixation
–Plates
–Combo
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Surgical Technique
Preference
• Distal lateral malleolar oblique osteotomy
• Remove articular surfaces maintaining
contour
• Correct deformity but minimize bone loss
ANKLE FUSION
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Surgical Technique
• Intra-op fluroscopic views
• Avoid subtalar joint - check motion
• Bone graft from resected lateral
malleolus
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Ankle Fusion
• DO NOT
PENETRATE THE
SUBTALAR JOINT!
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Ankle Arthrodesis:
Complications
• malunion
• pseudarthrosis ( 0 - 30%)
• infection ( 0 - 27%)
• neurovascular complications resulting in
amputation ( 0 - 13%)
• persistent pain
Ankle Arthrodesis: Gait
• walking speed is decreased an average of
16% secondary to a shortened stride length
• visual gait analysis is normal in 2/3 of
patients with ankle arthrodesis
Ouzounian et al, in Jahss 1991
Ankle Arthrodesis: Stress on
Adjacent Joints
• increased stress on:
–knee joint
–hip joint
–midtarsal joints
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Why a Total Ankle Arthoplasty?
• The Need for Other Surgical Options:
– bilateral involvement
• Other Advantages
– provides pain relief
– preserves joint motion & stability
Why a Total Ankle Arthoplasty?
• The Need for Other Surgical Options:
– patients with large bone loss
– subtalar and/or midtarsal arthrosis
– bilateral involvement
• Other Advantages
– provides pain relief
– preserves joint motion & stability
…Because
this is no
fun!
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TAA: History/Development
• Ankle arthoplasty since 1970- First
Generation
• Bucholtz 1st - Hamburg, Germany
• Many different designs :
– unconstrained or multiaxis
– constrained
– two-component prostheses
– three-component prostheses
Longer Term Follow-up:
Cemented Total Ankle Arthroplasty
Author Prosthesis Diagnosis/# Avg F/U SurvivalRate
Jensen/Kroner TPR RA(21) OA(2) 4.9 yrs 48%
Kitaoka, et al Mayo RA(125)SA(65)
OA(14)
5 yrs
10 yrs
79%
65%
15 yrs 61%
Kitaoka/Patzer Mayo RA(96) AA(8)SA(64) 9 yrs 64%
Wynn, et al Beck-Steffee RA(18)SA(12) 2 yrs 73%
5 yrs 40%
10 yrs 10%
TAA: What went wrong?
• Initially: did not respect the anatomy, the
kinematics, the alignment & stability of the
ankle joint
• excessive bone resections
• changed the level of the ankle axis
• constrained design
• poor cement fixation in fatty bone marrow
• multi-axial design relied on ligaments
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TAA: What went wrong?
• High incidence of complications
– delayed wound healing
– fibular impingement
– loosening (radiologic and clinical)
– malleolar fractures
TAA: What went wrong?
Conaxial ankle replacement
medial malleolus fracture
Tibial Component is Loose
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TAA: History / Development
• Second Generation Ankle Replacements
– preserve bone stock
– respect rotational axis
– respect tibiopedal alignment
– semiconstrained
– biological fixation
TAA: History / Development
• Second Generation Designs
– S.T.A.R (Stryker)
– Salto- Talaris (Integra Life Sciences now)
– Agility (Depuy)- unavailable now
– InBone/ Infinity- Prophecy
Technology(Wright Medical Technology)
– Trabecular Metal (Zimmer)
Agility : 2nd Generation Designs
• Agility prosthesis (Depuy, Warsaw,
Indiana)
–uncemented 3-component
– incorporates tibiofibular arthrodesis
–circumferential cortical loading
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Agility : 2nd Generation Designs
• 4.8 yr results (86 pts)
94% implant survival
– 55% no pain
– 28% mild pain
– 16% moderate pain
93% satisfied
– avg ROM 36°
Agility prosthesis Pyevich JBJS 1998
Agility : 2nd Generation Designs
Making Cuts & Templating
with External Fixator
Trial prosthesis
Agility : 2nd Generation Designs
Final implant Post-op Xray
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STAR : 2nd Generation Designs
• S.T.A.R prosthesis (Sbi now Stryker))
– 3-component design
– free-gliding polyethylene meniscus
– rotation/gliding between tibia and meniscus
– flexion/extension between talar component
STAR : 2nd Generation Designs
S.T.A.R prosthesis
STAR
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STAR : 2nd Generation Designs
2.5 yr results (20 pts) *
– 90% implant survival
– 90% excellent/good
Multicenter study of (131pts) **
– 1 year f/u: 8 failures
– 2 year f/u (71): 5 failures
– 2-7 yrs: 0 failures ** Schernberg, 1998
* Kofoed, Foot 1995
STAR : 2nd Generation Designs
6-month follow-up: STAR arthroplasty
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Complication
2 month later
9 months later
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• Italian
– Salto – ‘jump’
– Talaria – ‘winged
sandals’
• FDA approval
11/06
• Design based on
Salto Total Ankle
Prosthesis (Tornier)
– Used in Europe
– Mobile-bearing
• Why fixed bearing in US?
– One post-op study showed limited, if any, motion in PE insert in AP plane.
– FDA approval
• “Mobile instrumentation” – Tibia component
rotation based on talus component
• Anatomic talus design – Medial radius of
curvature smaller • Only lateral facet of
talus replaced • Groove in top of talar
component that articulates with PE – Forces the foot in
external rotation with dorsiflexion
• Ti plasma spray
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• Thin with a tibial
keel
– Tapered pedestal
on a thin shaft
– Insterted via
anterior cortical
window
• Ti plasma spray
InBone
(Wright Medical)
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Infinity- Wright Medical
Wright Medical Infinity TAR
Prophecy Technology
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Zimmer Trabecular Metal Total
Ankle System
Trabecular Metal Implant by Zimmer
Cut surfaces off of center axis with router:
one radius for talus and longer one for the tibia
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Cut surfaces off of center axis with router:
one radius for talus and longer one for the tibia
Cut surfaces off of center axis with router:
one radius for talus and longer one for the tibia
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Fibular Plating Balance CFL to Deltoid
Final Fluoroscopy
118
Conclusions
Indications:
– rheumatoid arthritic patients & patients with
low demands
Contraindications:
– talar AVN, Charcot Joint, neurologically
compromised foot, chronic infection
Relative Contraindication:
– youthful, active individuals
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Conclusions
• Pts. With symptomatic ankle arthritis have
many options for treatment
• Present Total Ankle Arthroplasties address
some of the earlier design problems
• Short term results are promising
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