Hallux Valgus ( Bunion ) 骨科 謝繼賢 醫師 2006-6-16

Hallux Valgus ( Bunion )

• 骨科 謝繼賢 醫師

• 2006-6-16

Terms

• Hallux valgus---Lateral subluxation of 1st MTP (metatarsophalangeal ) joint

• Hallux rigidus--- OA of 1st MTP joint

History and Physical Examination ( hallux valgus )

• Pain over the medial eminence,exacerbated by footwear

• Typical deformity

• Lateral metatarsalgia

• Plantar keratosis beneath lesser metatarsal heads

• Callosity on medial site of 1st MTP or hallux

Range of motion may be restricted, especially in dorsiflexion with hallux rigidus

• Range of motion may be restricted, especially in dorsiflexion with hallux rigidus

• Axial grind test---elicit pain in patient with hallux rigidus

stages 1

• from adolescents to 25 y/o

• bunion presents as a slight bump

Stage 2

• from 25 y/o to 55 y/o

• 1st metatarsal head adducts, hallux abducts ,callosity on medial site of 1st MTP joint

• Foot continues to pronate

Stage 3

• overlapping of hallux either above or below 2nd digit

• Hard to find footwear

• extreme pain, need surgical correction

Diagnostic imaging

• Weight-bearing radiographs

• Hallux valgus angle ( HVA )

• normally < 15-20 °

• The 1-2 intermetatarsal angle ( 1-2 IMA )

• normally < 9°

Nonoperative management

• Footwear modification

• Orthotic devices—to control pronation

• heat and mould the orthotic with foot in

• neutral calcaneal stance position

• NSAID

• Intrinsic foot strengthening exercise

• -- pick up chopsticks with toes

• Bunion strapping---in stage 1 patient

Orthotic

Anatomy

• More rounded metatarsal heads---related to development of hallux valgus

• Short 1st metatarsal

• Collateral ligaments and sesamoid ligaments

• FHB, abH, adH, EHB

Surgical Technique

• Dorsal Cheilectomy---in hallux rigidus pateint with isolated dorsal degenerative joint disease.

• Hallux valgus---a variety of techniques,based on the degree of deformity, i.e, HVA and 1-2 IMA

Surgical Technique

• 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

Surgical Technique

Modified McBride Procedure

Distal Chevron Osteotomy

Distal Chevron Osteotomy

Proximal Metatarsal Osteotomy

Proximal Metatarsal Osteotomy

Dorsal Cheilectomy (for hallux rigidus)

Dorsal Cheilectomy (for hallux rigidus)

Dorsal Cheilectomy (for hallux rigidus)