Grazia Pozzi1, Asma'a Al-Mnayyis2, Joan Almolla1, Domenico Albano3, Carmelo Messina4, Ilaria Merli5, Romeu Duarte Mesquita6, Luca Maria Sconfienza4. 1. Unit of Diagnostic and Interventional Radiology, IRCCS Istituto Ortopedico Galeazzi, Via Riccardo Galeazzi 4, 20161 Milano, Italy. 2. Department of Radiology, College of Medicine, Yarmouk University, Shafiq Irshidat St, Irbid 21163, Jordan. 3. Department of Radiology, Di. Bi. Med., University of Palermo, Via del Vespro 127, 90127 Palermo, Italy. Electronic address: albanodomenico@me.com. 4. Unit of Diagnostic and Interventional Radiology, IRCCS Istituto Ortopedico Galeazzi, Via Riccardo Galeazzi 4, 20161 Milano, Italy; Department of Biomedical Sciences for Health, University of Milano, Via Festa del Perdono 7, 20122 Milano, Italy. 5. School of Specialization in Radiodiagnostics, University of Milano, Via Festa del Perdono 7, 20122 Milano, Italy. 6. Radiology Department, Centro Hospitalar de Entre o Douro e Vouga, R. Dr. Cândido Pinho, 4520-211 Santa Maria da Feira, Portugal.
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 ± 13 years) with known PI and 60 patients (31 females, age 39 ± 19 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% CI = 0.839-0.930) and 0.866 for TT-PCL (95% CI = 0.796-0.912). The PT-PCL was 23.5 ± 3.8 mm in patients and 20.0 ± 2.7 mm in controls (P < 0.001). The TT-PCL was 22.9 ± 3.9 mm in patients and 20.5 ± 2.7 mm in controls (P = 0.002). Correlation between the PT-PCL and TT-PCL was R = 0.838, P < 0.001. The PT-PCL had 66.6% (95% CI = 0.542-0.790) diagnostic yield. The nPT-PCL was significantly higher in patients (0.302 ± 0.03) than controls (0.271 ± 0.03; P < 0.001) with 73.9% (95% CI = 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.
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 ± 13 years) with known PI and 60 patients (31 females, age 39 ± 19 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% CI = 0.839-0.930) and 0.866 for TT-PCL (95% CI = 0.796-0.912). The PT-PCL was 23.5 ± 3.8 mm in patients and 20.0 ± 2.7 mm in controls (P < 0.001). The TT-PCL was 22.9 ± 3.9 mm in patients and 20.5 ± 2.7 mm in controls (P = 0.002). Correlation between the PT-PCL and TT-PCL was R = 0.838, P < 0.001. The PT-PCL had 66.6% (95% CI = 0.542-0.790) diagnostic yield. The nPT-PCL was significantly higher in patients (0.302 ± 0.03) than controls (0.271 ± 0.03; P < 0.001) with 73.9% (95% CI = 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.
Authors: Alex E White; Peters T Otlans; Dylan P Horan; Daniel B Calem; William D Emper; Kevin B Freedman; Fotios P Tjoumakaris Journal: Orthop J Sports Med Date: 2021-05-20
Authors: Kyle S Stumetz; M D Gothard; Ronald F Walser; Alan G Greenwald; Wade W Justice Journal: J Orthop Surg Res Date: 2020-04-25 Impact factor: 2.359