OBJECTIVE The purpose of the study was to investigate if the TKA design (cruciate retaining (CR), posterior stabilized (PS), revision prostheses) had an influence on the bone tracer uptake (BTU) pattern at the origin of the popliteus muscle. MATERIALS AND METHODS A total of 92 knees (male:female = 46:46) which had undergone prior TKA were included in this retrospective study, comprising the following 3 groups: (i) CR primary TKA (n = 45); (ii) PS primary TKA (n = 24); (iii) revision TKA (n = 23). All patients received a SPECT/CT after TKA surgery. SPECT/CT images were reviewed for the presence of BTU in the lateral femoral condyle (origin of the popliteus muscle) by two observers using Syngo.via software (Siemens Healthcare, Erlangen, Germany). The observers recorded the BTU pattern qualitatively in the lateral femoral condyle as either (i) absent; (ii) present and diffuse; and (iii) present and focal in the region of the popliteus muscle origin. RESULTS In patients with a CR and PS design, focal increased BTU at the origin of the popliteus muscle was found in 80.0% and 83.3% respectively. Diffuse BTU was the predominant finding in patients with revision TKA (60.9%). The patterns of BTU did not show significant differences between the CR and the PS design. However, patterns of BTU differed significantly between primary TKA designs and revision TKA (p < 0.001). CONCLUSION Differences in patterns of BTU at the popliteus muscle origin between primary TKA and revision prosthesis may be the result of decreased insertional tensile forces of the popliteus muscle after revision surgery due to increased stability provided by the revision design.

中文翻译：

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与修订版TKA相比，原发性TKA中the肌起源处的局灶性骨示踪剂摄取增加。

目的本研究的目的是研究TKA设计（十字形保持（CR），后稳定（PS），翻修假体）是否对pop肌起源处的骨示踪剂摄取（BTU）模式有影响。材料与方法这项回顾性研究共纳入了92例曾行过TKA的膝盖（男：女= 46:46），包括以下3组：（i）CR原发性TKA（n = 45）；（ii）PS主TKA（n = 24）；（iii）修订版TKA（n = 23）。所有患者在TKA手术后均接受SPECT / CT检查。两名观察者使用Syngo.via软件（Siemens Healthcare，Erlangen，德国）检查了SPECT / CT图像中股骨外侧（（pop肌起源）中BTU的存在。观察者定性地将股骨头外侧the的BTU模式记录为（i）不存在；（ii）存在和扩散；（iii）存在于focal神经起源区域并集中在此区域。结果在CR和PS设计的患者中，pop肌起源处的局灶性BTU分别为80.0％和83.3％。弥漫性BTU是修订版TKA患者的主要发现（60.9％）。BTU的模式在CR和PS设计之间没有显示出显着差异。但是，基本TKA设计和修订版TKA之间的BTU模式差异显着（p <0.001）。