hallux valgus ug lecture
TRANSCRIPT
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Hallux ValgusD r Dhananjaya sabat MS, DNB,
MNAMS
Assistant Professor OrthopedicsMAMC & STC, New delhi
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INTRODUCTIONLateral deviation of the great toe and
medial deviation of the first metatarsal
Progressive subluxation of the first metatarsophalangeal (MTP) joint
Static deformity due to valgus angulation of the distal articular surface of the first metatarsal or the proximal phalangeal articular surface.
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PathophysiologyNo single causeIntrinsic conditions: 1. Metatarsus primus varus:
congenital / heriditary ( AD), 2. Pes planus, 3. ligamentous laxity, 4. neromuscular
Footwear: 15 times increased incidencefemale sex4th-6th decade ageRheumatoid arthritis
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AnatomyFour groups that encircle the first
MTP joint 1) Extensor hallucis longus and brevis2) Flexor hallucis longus and brevis3) Abductor4) Adductor
Deforming Musculature1. Abductor Hallucis
-Inserts in the plantar aspect of the proximal phalanx-Can draw the phalanx medial and push metatarsal
head lateral2. Adductor Hallucis
-2 origins-common tendon to plantar aspect of proximal
phalanx and lateral aspect of plantar plate/sesamoid complex
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AnatomyPlantar Plate
2 seasmoids incorporated into tendons of FHB
Plantar Plate formed by tendons of Adductor Hallucis, Abductor Hallucis, FHL and Joint Capsule
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Fig 8
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Clinical PresentationPAIN over the medial eminence (Bunion).
Pressure from footwear is the most frequent cause of this discomfort.
Bursal inflammationIrritation of the skinBreakdown of the skin may be noted.
Bunion consists of:Bony exostosis / prominence of the metatarsal headOverlying subcutaneous bursaHyperkeratosis of dermis
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Pronated Toe Fig 6
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Physical ExaminationSkin : calluses, areas of rednessSites of painMagnitude of the hallux valgus deformity Pronation of the great toe Motion of 1st MTP joint- increased or decreased, Pain
or crepitus, or both, with motion of the MTP joint Metatarsocuneiform joint for hypermobility
Examiner grasps the first metatarsal with the thumb and index finger and pushes it in a plantar lateral-to-dorsomedial direction; mobility > 9 mm represents hypermobility
Pes planus deformity , Contracture of the Achilles tendon
Mobility and structure of foot in generalGait analysis
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Radiographic ExaminationWeightbearing AP & LateralAxial (Sesamoid)Assess for bone and joint deformity
Length and shape of 1st MT
Congruent vs. Incongruent joint
Osteoarthrosis
Forefoot alignment is evaluated for metatarsus
Adductus
Hindfoot is Inspected for Pes Planus or Pes Cavus.
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Measure AnglesHallux Valgus angle: Intersection of longitudinal axis of 1st MT and proximal phalanx. Normal < 150
Intermetatarsal angleIntersection of 1st and 2nd MT. Normal < 90 ; increased with metatarsus primus varus
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Distal Metatarsal Articular Angle (DMMA)
Defines the relationship of the distal articular surface of the 1st MT to the longitudinal axis. Quantities the magnitude of lateral slope of articular surface.
With subluxation, the articular surface deviates laterally in relationship to the 1st Metatarsal. Usually < 60 .
Proximal Phalangeal Articular Angle (PPAA)
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CLASSIFICATION MILD MODERATE SEVERE
Hallux valgus angle < 20° 20° to 40° >40°
1-2 intermetatarsal angle
11° or less.
12- 15° 16° or more
Subluxation of the lateral sesamoid, as measured on an AP radiograph
< 50% 50% to 75%
> 75%
SEVERITY OF
DEFORMITY
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TREATMENTNon-operative vs. Operative
All patients should be treated non-operatively first.
Despite conservative measures, some patients eventually need surgical intervention.
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TreatmentNON-OPERATIVE
Footwear ModificationWiden toe box
decrease lateral deviation of great toedecrease inflammation and pain
Decrease heel heightprevent forward slide of the foot
Arch supportmay negate effects of pes planus
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Contracture of the Achilles tendon Stretching exercises Lengthening of the Achilles tendon Thermoplastic night splints
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TreatmentSURGICAL
Indications: Persistent PAIN not cosmetic complaintsProgression of deformityFailure of non-operative treatment
Goals:Correct all pathologic elements and yet
maintain a biomechanically functional forefoot
Usually will not result in a foot with normal appearance
Combine soft tissue procedures with bony procedures in almost all cases.
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TreatmentSURGICAL: SOFT TISSUE PROCEDURE
Distal Soft-Tissue ReconstructionMedial and lateral procedures Hallux Valgus angle <30 degrees IMA < 15 degrees High rate of recurrence if done without bony procedure Medial and lateral procedures at the same time
contraindicated.
Medial Procedures Tighten lax capsule advancement, plication or
resection Abductor must not be detached
Lateral Procedures Capsular release adductor longus release or
transfer Division of transverse MT
ligament risk NV bundle
•Medial side procedure recommended•Be aware of cutaneous branch of medial plantar nerve.• Lateral procedure more difficult.•Neurovascular risk.
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TreatmentSURGICAL: Bony ProceduresDistal MT: for IM angle 12-150
Mitchell {step cut}Wilson {Oblique}ChevronProximal MT: for IM angle >
150. Medial opening wedge, lateral closing wedge, cresentic or dome
Phalangeal: Proximal Phalanx Osteotomy-AkinCombination osteotomies Arthrodesis of MCP jt / Keller’s excission for arthritis of MTP jt.Metatarsocunieform procedures: arthrodesis (Lapidus) for
hypermobile first ray
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Distal MT OsteotomyMitchell Chevron
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Proximal Cresenteric Osteotomy
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Double Osteotomy Technique
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Surgical Algorhythm HVA IMA Procedure
< 40° < 13° to 15° modified McBride or distal chevron osteotomy
< 40 ° > 13° to 15° modified McBride and proximal osteotomy
>40° > 20° modified McBride and proximal osteotomy or arthrodesis
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ComplicationsSURGERYRecurrent deformity 20-30%Hallux VarusPronation deformityPainNeurologic InjuryOsteonecrosisPhyseal injury/arrestNonunion/malunion