Bunions and Hallux Valgus

CHAPTER 38
Bunions and Hallux Valgus


Armen S. Kelikian


Definition


1. Hallux valgus: metatarsus primus varus represents a complex of deformities and deficiencies that require relative versatility and adaptability in treatment.


Indications (Chevron Osteotomy)


1. Painful hallux


2. Intermetatarsal angle (IMA) <15 degrees (Fig. 38–1)


3. Distal metatarsal articular angle (DMAA) >10 degrees (bidirectional chevron) (Fig. 38–1)


Contraindications


1. Hypermobility of the first tarso-metatarsal joint


2. Revision (relative)


3. Arthritis of the metatarsophalangeal (MTP)


4. Peripheral vascular disease


5. Narcissism


Preoperative Preparation


1. Hallux valgus foot scores <70


2. Anteroposterior (AP) weight-bearing X-rays of the forefoot


3. Harris floor reaction imprints


Special Instruments, Position, and Anesthesia


1. Ankle block and ankle tourniquet (250 mm)


2. Patient positioned supine on standard operating room table


3. Microsagittal saw (medium blades)


4. 0.062- and 0.054-in K-wires with wire driver


5. Tenotomy scissors


6. Banana #67 Beaver blade


7. Ragnell, Davis, and Hohman retractors


Tips and Pearls


1. The Ragnell retractor is used to pull the proximal fragment medially to allow lateral translation of the capital or distal fragments.


2. An intra-articular adductor tenotomy is performed from medial to lateral using a banana blade.


What To Avoid


1. Avoid excessive lateral stripping of head/neck fragments.


2. Avoid crossing the osteotomy ends.


3. Avoid notching the first metatarsal cortex during the exostectomy.



image

Figure 38–1

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Jun 5, 2016 | Posted by in ORTHOPEDIC | Comments Off on Bunions and Hallux Valgus

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