Hyperechoic and low morphological changes in the prefemoral fat pad in individuals with knee osteoarthritis based on ultrasonographic findings

Kazuyuki Shibata; Masahiko Wakasa; Akira Saito; Minoru Kimoto; Yusuke Takahashi; Hiromichi Sato; Tetsuaki Kamada; Takuto Shinde; Hitomi Takahashi; Yoshiaki Kimura; Kyoji Okada

doi:10.4103/JMU.JMU_85_20

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ORIGINAL ARTICLE

Year : 2021 \| Volume : 29 \| Issue : 2 \| Page : 105-110

Hyperechoic and low morphological changes in the prefemoral fat pad in individuals with knee osteoarthritis based on ultrasonographic findings Kazuyuki Shibata¹, Masahiko Wakasa², Akira Saito², Minoru Kimoto², Yusuke Takahashi³, Hiromichi Sato⁴, Tetsuaki Kamada⁴, Takuto Shinde¹, Hitomi Takahashi⁵, Yoshiaki Kimura⁶, Kyoji Okada² ¹ Department of Rehabilitation, Akita City Hospital, Akita, Japan ² Department of Physical Therapy, Akita University Graduate School of Health Sciences, Akita, Japan ³ Department of Rehabilitation Medicine, Akita University Hospital, Akita, Japan ⁴ Department of Rehabilitation, Akita Kousei Medical Center, Akita, Japan ⁵ Department of Physical Therapy, School of Health Sciences, International University of Health and Welfare, Tochigi, Japan ⁶ Department of Orthopedic Surgery, Akita City Hospital, Akita, Japan Correspondence Address: Dr. Kazuyuki Shibata Department of Rehabilitation, Akita City Hospital, 4-30 Kawamoto-Matsuoka-cho, Akita 010-0933 Japan Source of Support: None, Conflict of Interest: None DOI: 10.4103/JMU.JMU_85_20

Background: To clarify the changes in the echo intensity (EI) in the prefemoral fat pad (PFP) and identify the relationship between the PFP and clinical features of knee osteoarthritis (OA). Methods: Twenty-six women with knee OA (mean age: 76 years) and 17 healthy women (mean age: 73 years) were enrolled. The Kellgren and Lawrence grading scale was used for the radiographic evaluation of knee OA. The EI of the PFP was measured as grayscale values. The change ratio of the anteroposterior PFP length during quadriceps contraction was measured. Knee range of motion and pain (100-mm visual analog scale) were evaluated. Results: The EI was significantly higher in the OA group than in the healthy group (P < 0.001). The change ratio of the PFP in the OA group was significantly lower than that in the healthy group (P < 0.001). The ranges of knee flexion and extension were correlated with the EI of the PFP (both P < 0.01) and the change ratio of the PFP (both P < 0.01). There was no significant correlation observed with knee pain. Conclusion: Hyperechoic changes and a decreased change ratio of the PFP were observed in the patients with knee OA. High EI and decreased morphological PFP changes were associated with decreased ranges of motion.



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