free functional muscle belgrade vma 2011
TRANSCRIPT
Functional Free Muscle
Transfer for Upper
Extremity Reconstruction
Milan Stevanovic, MD Professor of Orthopaedic Surgery
USC Keck School of Medicine
When and How
Introduction
• Loss of upper extremity function
secondary to brachial plexus
injuries or severe trauma is a
challenging problem
Introduction
• Advances of microsurgery
offered a new approach in
the management of these
injuries
•Tamai et al.
Free muscle transplants in
dogs, with microsurgical
neurovascular anastomoses
Plast Reconstr Surg. 1970
Donor Muscle
Considerations • Muscle Power
–Terzis, J Hand Surg, 1978
• Suggested that muscle bulk decreases with muscle transplantation to 25-50%
–Doi , Clin Plast Surg, 2002
• Transplanted muscles regained full strength, sometimes stronger than pre-transplanted power
•Stevanovic, Seaber,
Urbaniak
Canine experimental free
muscle transplantation.
Microsurgery. 1986
Functional Free Muscle
Indications
• Deficiency of critical motor function with no suitable tendon transfer options
• No suitable rotational muscle transfer
• Soft tissue defect requiring coverage in combination with functional loss
Functional Free Muscle
Special Indications
• Facial reanimation
Ralph Manktelow and Ron Zucker
•Manktelow, Zuker,
McKee
Functioning free
muscle transplantation.
J Hand Surg [Am]. 1984
Functional Free Muscle
Indications
• Functional reconstruction after: –Trauma
–BPBP
–Volkmann’s
–Tumor
–Congenital deficiencies
Functional Free Muscle
Upper Extremity Indications
• Deltoid
• Biceps
• Triceps
• Finger Flexors
• Finger Extensors
• Thenar
Functional Free Muscle
Goals (Manktelow)
• Supply a useful range of motion
• Provide adequate strength for functional activities
• FMT must be under volitional control
Functional Free Muscle
Pre-requisites
• Motivated patient
• Supple passive range of motion
• Suitable recipient site motor nerve and vessels
• Good soft tissue coverage and underlying tissue bed for tendon gliding
Donor Muscle
Options
• Gracilis
• Latissimus
• Rectus femoris
• Pectoralis Major
• Medial gastrocnemius
• Tensor fascia lata
• Serratus Anterior
Indications
Free gracilis
Gracilis Transfer with Skin
• Deltoid reconstruction
• Elbow flexion
• Elbow extension
• Finger flexion
• Finger extension
Anterior Deltoid
Pedicle Latissimus
Free gracilis
Finger extension Finger flexion
Achieve optimal muscle
resting length
Surgical Technique: Key Points
Surgical Technique: Key Points
• Establish strong & appropriately located origin and insertion
Free gracilis for
finger extension
Illustrative case:
Flexor Origin Slide
Nerve Graft
Vascular Anastamosis
and neurorraphy
Cable grafting of severely
compromised median nerve
pedicle
Skin paddle post
Debridement of
partial necrosis
Healthy and viable
Underlying muscle
opponensplasty
tenolysis
Functional results at one year
Donor Muscle
General Considerations
• Expendible donor muscle –sacrificed with acceptable donor site
morbidity
• Adequate length and excursion for new function
• Sufficient force
• Vascular pedicle permits transfer
Free muscle transfer • Type of blood supply
• I. One vascular pedicle
• II. Dominant pedicles and
minor pedicles
• V. One dominant pedicle
and secondary segmental
pedicles
Free muscle transfer • Type of blood supply
• I. Rectus femoris,Tensor fascia
• lata
• II. Gracilis,Biceps femoris,Soleus
• V. Latissimus dorsi,Pectoralis
• major
Donor Muscle
Considerations
• Muscle Type –pennate (stronger)
–strap (better excursion)
• Cross sectional area –pennate - greater cross sectional
area results in greater strength
• Excursion –estimated as 40% of the msucle
resting length
Donor Muscle
Considerations
• Muscle Type
–pennate (stronger)
–Rectus femoris
–strap (better excursion)
–Gracilis, Latissimus dorsi,
Donor Muscle
Considerations
• Muscle Excursion
–Ideally 6-7 cm of muscle
excursion to produce
functional range of flexion
of fingers and elbow
Surgical Technique
Free muscle transfer
• technically
demanding
• microvascular
anastomoses
Free gracilis transfer
to reconstruct finger flexion
after rhabdomyosarcoma
resection
Illustrative case:
Free gracilis for finger flexion
tumor
Free gracilis for finger flexion
Free gracilis for finger flexion
Free gracilis for finger flexion
Free gracilis for finger flexion
Free serratus anterior
to reconstruct opposition
3 yrs after crush left hand and
thenar muscle debridement
Illustrative case:
Imaging
Operative
Operative
Operative
Operative
Serratus anterior
Operative
Operative
Operative
Operative
Operative
Functional Free Latissimus Courtesy MB Wood
Surgical Technique: Key Points
• Minimize Ischemia Time
–Irreversible muscle loss
increases with time
–Non-linear relationship
Surgical Technique: Key Points
• Nerve Considerations
–Recipient site nerve should be
motor fibers
–Neurorraphy should be done
as close as possible to
transplanted muscle
Reconstruction of
elbow flexion 4 years after
brachial plexus injury
Illustrative case
Functional Free Muscle
Post-Operative Management
• Immobilization
–Elbow
• 8 weeks
–Finger
• Flexors - 4 weeks – start PROM
• Extensors – 6 weeks start PROM
Functional Free Muscle
Post-Operative Management
• After EMG evidence of reinnervation: – Motor re-education with therapist
guidance
– Short sessions, ending when muscle fatigues
– Slow , gradual correction of contracture. Passive elongation of muscle can result in muscle fiber injury
Complications
Functional Free Muscle
Transfer • Demanding procedure
• Meticulous technique
• Experience in microsurgery
Conclusions
Immediate Reconstruction
of
finger flexion after severe
Compartment
Syndrome with
liquifactive muscle
necrosis
Immediate Functional Reconstruction
Flexor Tendons
Median Nerve
Principles of Free Functional Muscle
Transfers
140
FIN
Thank you
Thank you