OBJECTIVE  The aim of this study was to assess computed tomography (CT) images of cadaveric feline stifles and record the relationship between the patella and femoral trochlea in normal stifles; then to investigate the effect of block recession trochleoplasty (BRT) with and without partial parasagittal patellectomy (PPP) on patellofemoral contact, depth of patellar recession and size of trochlea and patella. MATERIALS AND METHODS  The sample population included six cat cadavers (12 stifles). Preoperative CT scans with stifles in three positions: extended (155-165°), neutral (85-95°) and flexed (35-45°). Lateral stifle arthrotomy was followed by BRT. CT scans were taken as above. PPP was performed so the width of the patella was 1 mm narrower than the BRT. CT scans were repeated and CT measurements were taken. RESULTS  The area of contact between the patella and femoral trochlea was significantly reduced after BRT and then significantly increased after PPP. The depth of patellar recession was unchanged after BRT, but then was significantly higher after PPP. The patella was wider than the trochlea preoperatively and post-BRT and narrower post-PPP. Reduction in bone volume following PPP (mean: 20%) was 50% the reduction in patella width (mean: 40%). CONCLUSION  Block recession trochleoplasty did not improve patellar recession and decreased patellofemoral contact area. Following BRT, the patella rides the trochlear ridges and loses contact with the trochlear sulcus. Block recession trochleoplasty alone should not be performed in cats. Instead, BRT should be combined with PPP.

中文翻译：

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计算机断层扫描气管成形术和部分矢状旁矢状Pat切除术的计算机断层扫描评估。

目的本研究的目的是评估尸体猫if钉的计算机断层扫描（CT）图像，并记录record钉与正常钉中股骨滑车之间的关系。然后研究采用和不采用部分矢状位旁tell骨切除术（PPP）的块状后退性滑车成形术（BRT）对pa股接触、,骨后陷深度以及滑车和骨大小的影响。材料与方法样本人群中包括6只猫尸体（12针）。术前使用三个位置的针进行CT扫描：扩展（155-165°），中性（85-95°）和弯曲（35-45°）。外侧膝关节置换术后进行BRT。如上所述进行CT扫描。进行PPP，使so骨的宽度比BRT窄1毫米。重复进行CT扫描并进行CT测量。结果BRT后the骨与股骨滑车之间的接触面积显着减少，而PPP后显着增加。BRT后of骨后退的深度没有变化，但PPP后则明显更高。RT骨术前和BRT后比滑车宽，PPP后狭窄。PPP后的骨量减少（平均值：20％）为骨宽度减少50％（平均值：40％）。结论块状后退行滑囊成形术不能改善pa骨后退并减少decreased股接触面积。进行BRT后，ride骨越过滑车脊并失去与滑车沟的接触。不宜在猫中进行块状后退性滑车成形术。相反，BRT应该与PPP结合使用。