Middle patellar tendon to posterior cruciate ligament (PT-PCL) and normalized PT-PCL: New magnetic resonance indices for tibial tubercle position in patients with patellar instability.
Knee
; 25(5): 799-806, 2018 Oct.
Article
em En
| MEDLINE
| ID: mdl-29933931
ABSTRACT
BACKGROUND:
To demonstrate whether the distance between the middle point of the patellar tendon and posterior cruciate ligament (PT-PCL) calculated on a single axial MR image could be an alternative measure to tibial tubercle-PCL (TT-PCL) distance for TT lateralization without the need of imaging processing. To show that normalization of PT-PCL (nPT-PCL) against the maximum diameter of the tibial plateau may help to identify patients with patellar instability (PI).METHODS:
MR scans of 30 patients (13 females, age 32⯱â¯13â¯years) with known PI and 60 patients (31 females, age 39⯱â¯19â¯years) with no history of PI were reviewed. Two operators calculated TT-PCL, and PT-PCL nPT-PCL. Intraclass correlation coefficient, Student's t-test, Receiver Operator Characteristic curves, Spearman's Rho and McNemar's test were used.RESULTS:
Interobserver reproducibility was 0.894 for PT-PCL for TT-PCL (95% CIâ¯=â¯0.839-0.930) and 0.866 for TT-PCL (95% CIâ¯=â¯0.796-0.912). The PT-PCL was 23.5⯱â¯3.8â¯mm in patients and 20.0⯱â¯2.7â¯mm in controls (Pâ¯<â¯0.001). The TT-PCL was 22.9⯱â¯3.9â¯mm in patients and 20.5⯱â¯2.7â¯mm in controls (Pâ¯=â¯0.002). Correlation between the PT-PCL and TT-PCL was Râ¯=â¯0.838, Pâ¯<â¯0.001. The PT-PCL had 66.6% (95% CIâ¯=â¯0.542-0.790) diagnostic yield. The nPT-PCL was significantly higher in patients (0.302⯱â¯0.03) than controls (0.271⯱â¯0.03; Pâ¯<â¯0.001) with 73.9% (95% CIâ¯=â¯0.628-0.851) diagnostic yield.CONCLUSION:
The PT-PCL correlated with TT-PCL, with 66.6% diagnostic yield. The nPT-PCL may represent an additional index, with 73.9% diagnostic yield.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Tíbia
/
Imageamento por Ressonância Magnética
/
Ligamento Cruzado Posterior
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Ligamento Patelar
/
Articulação Patelofemoral
/
Instabilidade Articular
Tipo de estudo:
Prognostic_studies
Limite:
Adolescent
/
Adult
/
Female
/
Humans
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Male
/
Middle aged
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article