Forzisi Ida, Vezzoni Aldo, Vezzoni Luca, Drudi Dario, Bourbos Alexandros, Marcellin-Little Denis J
Clinica Veterinaria Vezzoni, Cremona, Italy.
Department of Surgical and Radiological Sciences and the JD Wheat Veterinary Orthopedic Research Laboratory, School of Veterinary Medicine, University of California, Davis, Davis, California, USA.
Vet Surg. 2025 Jan;54(1):199-207. doi: 10.1111/vsu.14180. Epub 2024 Oct 28.
To describe percentage length changes in the femur after total hip replacement (THR) performed before skeletal maturity.
Retrospective study.
Twenty-four dogs younger than 8.5 months which underwent unilateral THR and had radiographic follow up.
Preoperative and follow-up radiographs were reviewed. Radiographic measurements included the length of the greater trochanter, femoral diaphysis and distal epiphysis, width of the femur 10 mm distal to the distal aspect of the greater trochanter, width of the femur at 50%, and femoral condylar offset. Percentage changes in length over time were compared among operated and contralateral femurs used as controls. Measurements were collected in triplicate in 10 dogs to evaluate consistency.
All repeated measurements had excellent consistency. The percentage increase in length of the greater trochanter was smaller in operated femurs than controls (mean difference: -11.5%, p = .017), but no differences were observed for the femoral diaphysis and distal epiphysis (-1.0%, p = .595), or the femur overall (-2.3%, p = .232). The percentage increase in femoral cortical width was greater in operated femurs than controls, both 10 mm distal to the greater trochanter (4.6% difference, p = .037) and at 50% length (8.5% difference, p = .030).
In growing dogs, cementless THR decreased trochanteric growth by approximately 10% but did not change diaphyseal growth and femoral growth.
Cementless THR performed in skeletally immature dogs with severe hip problems did not impact femoral length in a clinically relevant fashion.
描述骨骼成熟前进行全髋关节置换（THR）后股骨长度的百分比变化。
回顾性研究。
24只年龄小于8.5个月的犬，接受了单侧THR并进行了影像学随访。
回顾术前和随访时的X线片。影像学测量包括大转子、股骨干和远端骨骺的长度，大转子远端10mm处股骨的宽度，股骨50%处的宽度，以及股骨髁偏移。比较手术侧股骨和作为对照的对侧股骨随时间的长度百分比变化。在10只犬中对测量值进行了三次重复采集以评估一致性。
所有重复测量的一致性都很好。手术侧股骨大转子长度的百分比增加小于对照组（平均差异：-11.5%，p = 0.017），但股骨干和远端骨骺未观察到差异（-1.0%，p = 0.595），股骨整体也未观察到差异（-2.3%，p = 0.232）。手术侧股骨皮质宽度的百分比增加大于对照组，在大转子远端10mm处（差异4.6%，p = 0.037）和长度50%处（差异8.5%，p = 0.030）均如此。
在生长中的犬中，非骨水泥型THR使大转子生长减少约10%，但不改变骨干生长和股骨生长。
在患有严重髋关节问题的骨骼未成熟犬中进行的非骨水泥型THR，未以临床相关方式影响股骨长度。
