AUTHOR=Pang Haotian , Guo Ruoyi , Zhuang Hanjie , Ben Yulong , Lou Yue , Zheng Pengfei 

TITLE=Risk factors for femoral overgrowth after femoral shortening osteotomy in children with developmental dysplasia of the hip

JOURNAL=Frontiers in Pediatrics

VOLUME=Volume 11 - 2023

YEAR=2023

URL=https://www.frontiersin.org/journals/pediatrics/articles/10.3389/fped.2023.1104014

DOI=10.3389/fped.2023.1104014

ISSN=2296-2360

ABSTRACT=Objective: To explore the risk factors of overgrowth after femoral shortening osteotomy in children with developmental dysplasia of the hip.
Methods: We included 52 children with unilateral developmental dysplasia of the hip (DDH) who underwent pelvic osteotomy combined with femoral shortening osteotomy between January 2016 and April 2018, including seven males (six left and one right hip) and 45 females (33 left and 12 right hips) with an average age of 5.00 ± 2.48 years, and an average follow-up time of 45.85 ± 6.22 months. The amount of overgrowth and limb length discrepancies (LLDs) were calculated. The risk factors of femoral overgrowth ≥ 1 cm and unequal length of lower limbs ≥ 1 cm were analyzed.
Results: There were statistical differences in age (P < 0.001) and operation duration (P = 0.010) between the two groups with femoral overgrowth <1 cm and ≥1 cm. There was a statistical difference in operation duration between the two groups (P < 0.001), but there was no statistical difference in sex, side, age, femoral osteotomy length, follow-up time, and femoral overgrowth between the two groups. Age (P < 0.001) is an independent influencing factor of femoral overgrowth in children with unilateral DDH after pelvic osteotomy and femoral shortening osteotomy, and a risk factor (P = 0.008) of LLD in these children. The incidence of LLD ≥ 1 cm increases by 1.06 times with each year of age increase.
Conclusion: The overgrowth and LLD of children with developmental dislocation of hip after pelvic osteotomy and femoral shortening osteotomy are significantly related to age. There is no significant difference between different pelvic osteotomies for femoral overgrowth in children. Therefore, surgeons should consider the possibility of LLD after femoral shortening osteotomy in children of a young age.