Παθησεις καμπτήρων τενόντων του χεριού στα παιδιά- hand...
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Flexor Tendon Lesions in Children
Nikolaos A Darlis, MD, PhD
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Primary Flexor Tendon Repair
Secondary Reconstruction
Infantile Trigger Digits
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Flexor Tendon Lacerations
Incidence• 3.6 per 100,000 children
per year• falling on broken glass• zones II or V most
common
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Children are different…
• Diagnosis more difficult
• Late presentation more common
• Sensory examination not feasible
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Approach
• midlateral incisions not advised in infants and very young children.
•absorbable sutures for skin closure
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Strands...
• less than 2 years old: 2-strand– FDP is 2–3 mm wide and 0.5–1 mm thick
•over 5 years old : 4-strand feasible
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FDP only repair
• acceptable option in children• without FDS excision
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Zone I injuries
• pull-out suture with a button tie-over; proximal to nail bed
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Rehabilitation
Immobilization up to 4 weeks tolerated in
young children
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Rehabilitation
• Teenagers: as for adult injuries
• Between 5 and 10 years: modified early mobilization under hand therapist supervision, but immobilized between PT sessions
• Pre-schoolers (0–5 years):(above elbow) cast for max of 4 weeks
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Inadvertent Grasping• Cast
– Elbow 120° of flexion, forearm in supination, wrist and fingers in flexion
• ‘pulp to palm’ suture before applying the cast
• Toddlers and infants who have just started to walk splint additional 2 weeks
• botulinum toxin type A (50–100 units) to muscle bellies ofinjured tendons+ passive ROM
Tuzuner et al. (2004)
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But still…
Primary or Delayed Primary flexor tendon repair in children produces satisfactory results in 72 to 89% of the patients
Vahvanev 1981, Hollwarth 1985, Grobbelaar 1994, O’Connell 1994, Berndtsson 1995,
Fittussi 1999, Kato 2002
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Complications
• Compared with adults, adhesions less likely in children
…but not uncommon
• Joint contractures: uncommon
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Complications
• Atrophy of the injured finger may affect unrepaired / repaired/ delayed repaired/ reconstructed flexor tendons
• Growth arrest of the distal phalanx in zone 1 injuries
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Failed Repair
• Tendon adhesions • Rerupture• Joint contracture (rare)
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Flexor tenolysis
• Better if age > 10 yrs• Compliance!
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One-stage tendon grafting
• prerequisites: Full passive motion, minimal scarring, intact annular pulleys…
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Two-stage flexor tendon grafting (Modified Paneva Technique)
FDPFDS
STAG E II
FDPFDS
S.RRe c o nstruc te d p ulle ys
STAG E I
FDPFDS
Sc a r tissuePre -o p
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Stage I
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FDPMN
FDS
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Stage II
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Άριστο Καλό Ικανοποιητικό Πτωχό
Results Buck Gramco scale
Excellent Good Satisfactory Poor
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Flexor Tendon Reconstruction in Children
Amadio et al 1988 N=10 80% failure
Αmadio 1992 N=14 50% failure
Valenti & Gilbert 2000
N=22 73% good & excellent13% poor
Darlis & Beris, 2003
N=9 88% good & excellent12% poor
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Pediatric Trigger Thumb
• 0.3-2.2% of all congenital upper extremity anomalies• 3.3/1000 live births @ 1 year of age
• either with a fixed contracture of interphalangeal (IP) joint or clicking or snapping of the thumb IP joint
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Congenital(?) Trigger Thumb
• No trigger thumb in 1116 newborns5 developed later (8-30 mo)
Kikuchi & Ogino JHS(A), 2007
• No trigger thumb in 7700 newbornsMoon et al, JHS (B), 2001
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Spontaneous Resolution
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Risks of Surgery
General anesthesia before the age of 3?
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Late Surgery May Cause Deformity?
• Not until well above the 3 year limit
–23 thumbs after the age of 3, no residual flexion deformity. Skov et al 1990
–61 children above 3 years of age no residual contracture. Dunsmuir & Sherlock, 2000
–Tan et al, 2002–31 trigger thumbs > 5 years of age no deformity. Hanet al 2010
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When to Operate:
• 1. The natural history – 7/10 spontaneous resolution at median time of 4 years after diagnosis– explained to the parents, and they do not want to wait for such a long duration.
• 2. Failure of previous operation
• 3. Frequent annoying pain
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Pediatric Trigger Finger Different
• Spontaneous resolution rare
• A1 pulley release may not be adequate (A2/ slip of superficialis removal)
Baek GH © ASSH 2014
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Pediatric Trigger Finger Different
• Prolonged PIP flexion may cause hypoplasia of the proximal phalangeal head
Baek GH © ASSH 2014
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