Schweng Gregor, Bockstahler Barbara, Tichy Alexander, Zahn Klaus, Haimel Georg, Schwarz Günter, Schnabl-Feichter Eva
Department for Companion Animals and Horses, University Clinic for Small Animals, Small Animal Surgery, University of Veterinary Medicine, Vienna, Austria.
Department for Companion Animals and Horses, University Clinic for Small Animals, Small Animal Surgery, Section for Physical Therapy, University of Veterinary Medicine, Vienna, Austria.
J Feline Med Surg. 2024 Dec;26(12):1098612X241297894. doi: 10.1177/1098612X241297894.
The aim of this study was to evaluate ground reaction forces (GRFs) in cats after unilateral total hip replacement (THR) and compare them with cats after femoral head and neck ostectomy (FHO).
The databases of the Small Animal Clinic of the Veterinary University in Vienna and three referral clinics were searched for cats that had undergone unilateral THR with the BioMedtrix Micro total hip system or FHO more than 6 months previously. Owners were invited to complete a survey and bring their cats for re-examination, inlcuding clinical and orthopaedic examinations, hip radiography and a gait analysis using a pressure-sensitive plate.
Nine cats were included in each group. Cats after THR showed larger GRF values (peak vertical force [PFz] and vertical impulse [IFz] normalised to total force [%TF]) on the operated limb. The resulting symmetry indices (SIs) were lower in terms of vertical force in 7/9 (78%) cats and vertical impulse in 6/9 (67%) cats between the hindlimbs in cats after THR compared with FHO - SI (PFz) = 3.31% ± 2.19% (THR) vs 4.84% ± 2.99% (FHO) and SI (IFz) = 5.17% ± 3.66% (THR) vs 8.27% ± 3.12% (FHO). Cats after FHO showed significantly lower muscle circumference and range of motion (ROM) at the operated hindlimb compared with the contralateral side, whereas cats after THR showed no statistically significant differences between their hindlimbs. Owner surveys revealed significant differences in their subjective assessment of activity and change in gait between the two groups, with better values for cats after THR.
This was the first study that measured GRFs in cats after THR. PFz (%TF) and IFz (%TF) values were higher in the operated limb of the THR group than in those of the FHO group, resulting in lower symmetry indices (indicating better symmetry) and better loading of the corresponding hindlimb. This finding is clinically relevant and can help in making decisions regarding the treatment of hip joint pathologies in cats.
本研究旨在评估单侧全髋关节置换（THR）术后猫的地面反作用力（GRF），并将其与股骨头颈切除术（FHO）术后的猫进行比较。
检索维也纳兽医大学小动物诊所及三家转诊诊所的数据库，寻找6个月前接受过使用BioMedtrix微型全髋关节系统的单侧THR或FHO的猫。邀请猫主人完成一份调查问卷，并带他们的猫前来复诊，包括临床和骨科检查、髋关节X光检查以及使用压力感应板进行步态分析。
每组纳入9只猫。THR术后的猫在手术肢体上显示出更大的GRF值（归一化至总力的峰值垂直力[PFz]和垂直冲量[IFz][%TF]）。与FHO相比，THR术后猫的后肢之间，在7/9（78%）的猫中垂直力方面以及在6/9（67%）的猫中垂直冲量方面，所得对称指数（SI）更低——SI（PFz）=3.31%±2.19%（THR）对比4.84%±2.99%（FHO），SI（IFz）=5.17%±3.66%（THR）对比8.27%±3.12%（FHO）。FHO术后的猫与对侧相比，手术侧后肢的肌肉周长和活动范围（ROM）显著更低，而THR术后的猫其后肢之间无统计学显著差异。主人调查显示两组在对活动的主观评估和步态变化方面存在显著差异，THR术后的猫得分更高。
这是第一项测量THR术后猫的GRF的研究。THR组手术肢体的PFz（%TF）和IFz（%TF）值高于FHO组，导致对称指数更低（表明对称性更好）以及相应后肢的负荷更好。这一发现具有临床相关性，并有助于在猫髋关节疾病的治疗决策中提供帮助。
