OBJECTIVE The accessory anterolateral talar facet (AALTF) is a developmental entity described as a potential cause for rigid, painful flat foot. This study evaluates the possible association between the AALTF and other flat foot etiologies, specifically different types of tarsal coalitions. MATERIALS AND METHODS We evaluated patients with tarsal coalition or sinus tarsi syndrome for an AALTF on CT and MRI. Exclusion criteria included acute ankle trauma, recent surgery, motion or metal artifacts. We evaluated the AALTF length and height, and the lateral talocalcaneal structures for associated findings. The presence of calcaneonavicular (CNC), intra-articular middle facet talocalcaneal (MFTCC), posterior facet talocalcaneal (PFTCC), extra-articular posteromedial talocalcaneal (EATCC) and other rare coalitions were also evaluated. RESULTS One hundred eighty-seven patients were included (age range 14-91 years; mean ± SD; 50 ± 17 years). The AALTF prevalence in the study population was 31.55% (59/187), 40.91% in men, and 23.23% in women. The AALTF average length was 4.5 ± 1.1 mm, and average height was 8.9 ± 3.4 mm. The AALTF was found to be significantly associated with lateral talocalcaneal osseous changes such as cortical thickening and cystic changes (34/59 and 24/59 respectively, P < 0.01). The AALTF was also found to be significantly associated with sinus tarsi edema on MRI (45/52, P < 0.05). The AALTF was also significantly associated with EATCC (19/59, P < 0.01) and MFTCC (7/59, P < 0.05). No significant association was found with CNC, PFTCC or other rare coalitions. CONCLUSION The AALTF is common and significantly associated with some tarsal coalitions, specifically EATCC and MFTCC. When an AALTF or coalition is identified, special attention should be made to evaluate for other associated pathologies, as this could potentially affect management.

中文翻译：

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与联合相关的前外侧距骨小平面：患病率和横断面特征。

目的副前距骨小关节面（AALTF）是一种发育实体，被描述为僵硬，疼痛的扁平足的潜在原因。这项研究评估了AALTF与其他扁平足病因之间的可能联系，特别是不同类型的联合。材料和方法我们通过CT和MRI评估了联合或鼻窦综合征患者的AALTF。排除标准包括急性踝关节创伤，近期手术，运动或金属制品。我们评估了AALTF的长度和高度，以及外侧骨结构的相关发现。还评估了钙管神经血管（CNC），关节内中小关节管（MFTCC），后小关节管（PFTCC），关节外后poster管（EATCC）和其他罕见联合的存在。结果纳入187例患者（年龄14-91岁；平均±SD； 50±17岁）。研究人群的AALTF患病率为31.55％（59/187），男性为40.91％，女性为23.23％。AALTF的平均长度为4.5±1.1mm，平均高度为8.9±3.4mm。发现AALTF与侧lateral骨头骨改变（例如皮质增厚和囊性改变）显着相关（分别为34/59和24/59，P <0.01）。MRI也发现AALTF与鼻窦水肿显着相关（45/52，P <0.05）。AALTF也与EATCC（19/59，P <0.01）和MFTCC（7/59，P <0.05）显着相关。没有发现与CNC，PFTCC或其他罕见联盟有显着关联。结论AALTF很常见，并且与某些族联盟密切相关，特别是EATCC和MFTCC。确定了AALTF或联盟后，应特别注意评估其他相关的病理，因为这可能会影响管理。