The inverted Z bunionectomy: quantitative analysis of the scarf and inverted scarf bunionectomy osteotomies in fresh cadaveric matched pair specimens.
Quantitative analyses of the Scarf/Z and inverted Scarf/Z bunionectomy osteotomy procedures utilizing two-screw fixation were performed in fresh cadaveric specimens. Eighteen trials (nine matched pair feet) were used for direct comparison. Ultimate strength and failure areas were examined. Trial results revealed a strong statistically significant positive effect. The inverted Z approach was found, on average, 1.6 times stronger in resisting simulated weightbearing forces on the capital fragment to failure than that of the traditional Z bunionectomy osteotomy.
Department of Orthopedic Surgery, Loyola University Medical Center, Maywood, Illinois.
J M
JM
Miller
R
R
Stuck
M
M
Sartori
A
A
Patwardhan
R
R
Cane
L
L
Vrbos
D000368:Aged; D000369:Aged, 80 and over; D001863:Bone Screws; D004868:Equipment Failure; D050723:Fractures, Bone / Q000503:physiopathology; D006215:Hallux Valgus / Q000503:physiopathology / Q000601:surgery*; D006801:Humans; D008682:Metatarsal Bones / Q000503:physiopathology / Q000601:surgery*; D008875:Middle Aged; D010027:Osteotomy / Q000295:instrumentation / Q000379:methods*; D012399:Rotation; D012815:Signal Processing, Computer-Assisted; D013314:Stress, Mechanical; D016474:Weight-Bearing