Comparative study of the tibial tubercle-trochlear groove distance measured in two ways and tibial tubercle-posterior cruciate ligament distance in patients with patellofemoral instability

被引:7
|
作者
Shu, Lei [1 ]
Ni, Qubo [1 ]
Yang, Xu [1 ]
Chen, Biao [1 ]
Wang, Hua [1 ]
Chen, Liaobin [1 ]
机构
[1] Wuhan Univ, Zhongnan Hosp, Dept Orthoped Surg, Wuhan 430071, Peoples R China
基金
中国国家自然科学基金;
关键词
Patellofemoral instability; Patella dislocation; TT-TG distance; TT-TG distance under three-dimensional CT reconstruction; TT-PCL distance; FEMORAL ROTATIONAL ALIGNMENT; PATELLAR DISLOCATION; ANTEROPOSTERIOR AXIS; TUBEROSITY; KNEE;
D O I
10.1186/s13018-020-01726-2
中图分类号
R826.8 [整形外科学]; R782.2 [口腔颌面部整形外科学]; R726.2 [小儿整形外科学]; R62 [整形外科学(修复外科学)];
学科分类号
摘要
Background A comparative analysis of the strengths and weaknesses of three different methods for radiologic evaluation of patellofemoral instability (PFI). Methods Computed tomography (CT) and magnetic resonance imaging (MRI) were performed in 47 patients with or without PFI. The tibial tubercle-trochlear groove (TT-TG) distance was measured by two observers through conventional CT and three-dimensional CT reconstruction (TDR-TT-TG) respectively and the tibial tubercle-posterior cruciate ligament (TT-PCL) distance with MRI. The intraclass correlation coefficient (ICC) was used to evaluate the interobserver reliability. In addition, the differences of three measurements between different patients were compared. The consistency of TT-TG and TDR-TT-TG was analyzed by the Bland-Altman method. Results The ICCs of three measurements were high between two observers; the results were TT-TG (ICC = 0.852), TDR-TT-TG (ICC = 0.864), and TT-PCL (ICC = 0.758). The values of PFI patients were significantly higher than those of non-PFI patients, and the mean TT-TG, TDR-TT-TG, and TT-PCL distance in patients with PFI were 19.0 +/- 3.8 mm, 19.0 +/- 3.7 mm, and 25.1 +/- 3.6 mm, respectively. There was no statistically significant difference between the TT-TG distance and the TDR-TT-TG distance, we found no significant difference. The Bland-Altman analysis showed that the TDR-TT-TG distance was in good agreement with the TT-TG distance. Conclusion All three methods can be used to assess PFI; the TDR-TT-TG measurement method has superior operability and better interobserver consistency. It may be an alternative method to the conventional TT-TG distance measurement.
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页数:7
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