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Skeletal Radiology
Published in: Skeletal Radiology 8/2023

07-03-2023 | Magnetic Resonance Imaging | Scientific Article

The infrapatellar plica of the knee: analysis of relationship with femoral trochlear chondrosis using radiographs and 3.0-T MRI

Authors: Yasuhiro Kawahara, Hirofumi Koike, Masaaki Nonoshita, Akiko Koga, Ko Chiba, Nozomi Oki, Masataka Uetani

Published in: Skeletal Radiology | Issue 8/2023

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Abstract

Objective

To assess the relationship of the infrapatellar plica (IPP) with femoral trochlear chondrosis (FTC) using radiographs and 3.0-T MRI.

Materials and methods

Four hundred eighty-three knees of 476 patients undergoing radiography and MRI were reviewed, and 280 knees of 276 patients were included. We performed a comparison of the frequency of the IPP between men and women, and that of FTC and chondromalacia patella between knees with and without the IPP. In knees with the IPP, we analyzed the correlation between FTC and sex, age, laterality, Insall-Salvati ratio (ISR), femoral sulcus angle, tilting angle, height of insertion of the IPP to Hoffa’s fat pad, and width of the IPP.

Results

The IPP was found in 192 of 280 knees (68.6%) overall and was more common in men than in women (100 of 132 [75.8%], 92 of 148 [62.2%], p = 0.01). FTC was observed in 26 of 280 (9.3%) and was only in knees with the IPP (knees with the IPP: 26 of 192 [13.5%], knees without the IPP: 0 of 88 [0%], p < 0.001). In knees with the IPP, ISR was significantly greater in knees with FTC (p = 0.002). ISR was the only significant factor associated with FTC (odds ratio: 2.87, 95% confidence interval: 1.14, 7.22, p = 0.03), and the cutoff value of ISR for FTC was > 1.00 with sensitivity of 69.2% and specificity of 63.9%.

Conclusion

Presence of the IPP combined with ISR > 1.00 was correlated with FTC.
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Metadata
Title
The infrapatellar plica of the knee: analysis of relationship with femoral trochlear chondrosis using radiographs and 3.0-T MRI
Authors
Yasuhiro Kawahara
Hirofumi Koike
Masaaki Nonoshita
Akiko Koga
Ko Chiba
Nozomi Oki
Masataka Uetani
Publication date
07-03-2023
Publisher
Springer Berlin Heidelberg
Published in
Skeletal Radiology / Issue 8/2023
Print ISSN: 0364-2348
Electronic ISSN: 1432-2161
DOI
https://doi.org/10.1007/s00256-023-04318-3

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