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Updated: Aug 8, 2026

In Vivo Measurement of Hindlimb Dorsiflexor Isometric Torque from Pig
Published on: September 3, 2021
Progressive coxa vara by eccentric growth tethering in immature pigs
Chia-Hsieh Chang1, Chau-Hwa Chi, Zhon-Liau Lee
1Department of Orthopedic Surgery, Chang Gung Children Hospital, Taoyuan, National Taiwan University, Taipei, Taiwan. chiahchang@yahoo.com.tw
Abstract:
The present study tested progressive coxa vara by eccentric growth tethering that might be used to correct coxa valga in cerebral palsy. Eight young pigs received screw fixation at inferior portion of right femoral head at age 4 months and were killed at age 7.25 months for bilateral femurs for comparison. The neck-shaft angle at the tethered side was significantly less than that at the control side (129.8 vs. 138.3 degrees , P<0.05). Histological study showed bony bar formation. Eccentric growth tethering by one screw resulted in a reduction of neck-shaft angle by 8.5 degrees and shortening of femoral length by 4%.
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