achilles tendon disorders daniel penello foot & ankle rounds
TRANSCRIPT
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Achilles Tendon Disorders
Daniel Penello
Foot & Ankle Rounds
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Anatomy
Largest tendon in the body
Origin from gastrocnemius and soleus muscles
Insertion on calcaneal tuberosity
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Anatomy
Lacks a true synovial sheathParatenon has visceral and parietal layersAllows for 1.5cm of tendon glide
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Anatomy
ParatenonAnterior – richly vascularizedThe remainder – multiple thin membranes
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Anatomy
Blood supply1) Musculotendinous junction
2) Osseous insertion on calcaneus
3) Multiple mesotenal vessels on anterior surface of paratenon (in adipose)
– Transverse vincula Fewest @ 2 to 6 cm proximal to osseous insertion
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Physiology
Remarkable response to stressExercise induces tendon diameter increase Inactivity or immobilization causes rapid
atrophyAge-related decreases in cell density,
collagen fibril diameter and densityOlder athletes have higher injury
susceptibility
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Biomechanics
Gastrocnemius-soleus-Achilles complexSpans 3 joints
Flex kneePlantar flex tibiotalar jointSupinate subtalar joint
Up to 10 times body weight through tendon when running
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Achilles Tendon Rupture
Pathophysiology Repetitive
microtrauma in a relatively hypovascular area.
Reparative process unable to keep up
May be on the background of a degenerative tendon
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Achilles Tendon Rupture: Textbook Facts
Antecedent tendinitis/tendinosis in 15%
75% of sports-related ruptures happen in patients between 30-40 years of age.
Most ruptures occur in watershed area 4cm proximal to the calcaneal insertion.
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Achilles Tendon Rupture
History Feels like being kicked in the leg Case reports of fluoroquinolone use, steroid
injections Mechanism
Eccentric loading (running backwards in tennis) Sudden unexpected dorsiflexion of ankle (Direct blow or laceration)
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Physical Exam
Prone patient with feet over edge of bed
Palpation of entire length of muscle-tendon unit during active and passive ROM
Compare tendon width to other side
Note tenderness, crepitation, warmth, swelling, nodularity, palpable defects
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Achilles Tendon Rupture
PhysicalPartial
Localized tenderness +/- nodularityComplete
DefectCannot heel raisePositive Thompson test
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Achilles Tendon Rupture
Diagnostic Pitfalls23% missed by Primary Physician
(Inglis & Sculco)
Tendon defect can be masked by hematoma
Plantar-flexion power of extrinsic foot flexors retained
Thompson test can produce a false-negative if accessory ankle flexors also squeezed
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Imaging
Ultrasound Inexpensive, fast,
reproducable, dynamic examination possible
Operator dependentBest to measure thickness
and gapGood screening test for
complete rupture
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Imaging
MRIExpensive, not
dynamicBetter at detecting
partial ruptures and staging degenerative changes, (monitor healing)
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Management Goals
Restore musculotendinous length and tension.
Optimize gastro-soleous strength and function
Avoid ankle stiffness
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Conservative Management
Cast in Plantarflexion CAM Walker or cast with plantarflexion q 2 wks
2 wks
Allow progressive weight-bearing in removable cast
Remove cast and walk with shoe lift. Start with 2cm x 1 month, then 1cm x1 month then D/C
4 weeks
Start physio for ROM exercises
When WBAT and foot is plantigrade
Start a strengthening program
2- 4 weeks
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Surgical Management
Preserve anterior paratenon blood supply
Beware of sural nerveDebride and approximate tendon endsUse 2-4 stranded locked suture
techniqueMay augment with absorbable sutureClose paratenon separately
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Surgical Management
Bunnell Suture
Modified Kessler
Many techniques available
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Surgical Management : Post– op Care
Assess strength of repair, tension and ROM intra-op.
Apply cast with ankle in the least amount of plantarflexion that can be safely attained.
Patient returns to fracture clinic 2 weeks post-op.
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Variations in Post-op Protocols
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Functional Bracing
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Post- Op Care
Cast applied in OR Remove sutures, apply a walking cast with heel lift2 wks
Allow progressive weight-bearing in removable cast
Remove cast and walk with a 1cm shoe lift x 1 month then D/C.
2 weeks
Start physio for ROM exercises. No active plantarflexion
When WBAT and foot is plantigrade
Start a strengthening program
2- 4 weeks
Touch WB
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Surgical Management:Post-op Care
J Trauma. 2003 Jun;54(6):1171-80; discussion 1180-1. Kangas J et al.
Early functional treatment versus early immobilization in tension of the musculotendinous unit after Achilles rupture repair: a prospective, randomized, clinical study.
50 pts had repair of Achilles rupture
Casted in neutral x 6 weeks. WBAT at 3 weeks
Immediate active ROM from PF to neutral. WBAT at 3 wk
Better calf strength only for first 3 months.
One re-rupture
Two re-ruptures
One deep infection
Same satisfaction
25 25
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Conservative vs Surgical
Acute rupture of tendon Achillis. A prospective randomised study of comparison between surgical and non-surgical treatment.Moller M, et al. J Bone Joint Surg Br. 2001 Aug;83(5):863-8
112 patients
Surgery +
Early functional rehab in brace
Casted x 8 wks
21 % re-rupture 1.7% re-rupture
5% infection
2% Sural nerve inj.No difference in functional outcome
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Summary of Pooled Outcome Measures
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Risk of Re-Rupture
Surgery = 68% risk reduction for re-rupture