The infrapatellar fat pad is a dynamic and mobile structure, which deforms during knee motion, and has proximal extensions which wrap around the patella
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Infrapatellar fat pad
Patellar ligament
Quadriceps tendon
Fat pad
Infrapatellar fat pad
Vascularity
Patellar ligament
Fat pad
Quadriceps tendon
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Infrapatellar fat pad
Fat pad
Patellar ligament
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Infrapatellar fat pad
Fat pad
Patellar ligament
Anterior knee pain
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The purpose of this investigation was to characterize the MRI appearance of the quadriceps fat pad and to correlate the findings with other knee abnormalities, anatomic measurements of the extensor mechanism, and findings from history and at physical examination.Ninety-two consecutive knee MRI examinations from 84 patients were retrospectively reviewed by two musculoskeletal radiologists for quadriceps fat pad enlargement and signal intensity. Other data from the retrospective review included infrapatellar and prefemoral fat pad signal intensity, quadriceps and patellar tendon abnormalities, joint effusion, medial plica, chondromalacia, articular muscle thickness, and prepatellar edema. The patellar length, patellar articular length, patellar tendon length, and femoral sulcus angle were measured. MRI reports were reviewed for meniscal and ligament abnormalities. Clinical data were reviewed for findings of anterior knee pain in the history and at physical examination. The chi-square and Student's t tests were used to determine significant associations.Twelve percent (11/92) of MRI examinations showed quadriceps fat pad mass effect on the suprapatellar recess, which was associated with intermediate or fluid signal intensity of the quadriceps fat pad (chi(2) = 7.19, p = 0.0274) but with no other findings on knee MRI. Anterior knee pain at physical examination was associated with quadriceps fat pad mass effect (chi(2) = 8.76, p = 0.0031), medial collateral ligament abnormality (chi(2) = 4.83, p = 0.0031), and history of anterior knee pain (chi (2) = 22.76, p < 0.0001).Enlargement of the quadriceps fat pad on MRI has a prevalence of 12% and is significantly associated with intermediate or fluid signal intensity of the quadriceps fat pad and anterior knee pain.
Infrapatellar fat pad
Quadriceps tendon
Fat pad
Knee pain
Patellar ligament
Anterior knee pain
Sulcus
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Infrapatellar fat pad
Fat pad
Patellar ligament
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Infrapatellar fat pad
Fat pad
Quadriceps tendon
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Infrapatellar fat pad
Fibroma
Fat pad
Tendon sheath
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Purpose Quadriceps fat pad is located posterior to the quadriceps tendon. Increased signal intensity of this fat pad is seen on routine knee magnetic resonance imaging (MRI) examinations, but the exact mechanism and related pathologies are not clear. In this study we aimed to evaluate the relationship between MRI signal intensity and morphological features of quadriceps fat pad, as well as various pathologies of the patellofemoral joint. Material and methods Sixty-one knees with quadriceps fat pad oedema out of 457 knee MRI examinations were included. Quadriceps fat pad signal intensity, dimensions, posterior indentation, and various parameters related to patellofemoral joint such as trochlear facet asymmetry, trochlear depth and sulcus angle, and the Insall-Salvati ratio were evaluated. Results There was no statistically significant correlation between quadriceps fat pad oedema intensity and its dimensions, but it was significant when compared to posterior indentation. There was no correlation between fat pad oedema and each of the pathologies. However, there was a significant correlation between the presence of fat pad oedema and the presence of at least one of the pathologies related to patellofemoral joint. Conclusions Quadriceps fat pad oedema detected in MRI examinations should warn the radiologist against the presence of various pathologies related to the patellofemoral joint.
Infrapatellar fat pad
Quadriceps tendon
Fat pad
Patellofemoral joint
Sulcus
Facet (psychology)
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Infrapatellar fat pad
Patellar ligament
Fat pad
Quadriceps tendon
Blood supply
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Objective:To assess the effects of intrapatellar fat pad on the patellar height after TKA.Methods:116 primary TKA(86 patients) of osteoarthritis were divided into two groups(A and B).Group A(59 cases) was infrapatellar fat pad preserved.Group B(57 cases) was intrapatellar fat pad excised.The Insall-Salvati ratio was measured on preoperative and postoperative lateral radiographs which were taken with the knee in a position of 30° flexion to reflect the patellar height.Results:The preoperative and postoperative patellar height showed no statistic significant difference in Group A(P 0.05) and a significant change in Group B(P 0.05).Conclusion:The excision of intrapatellar fat pad would cause the patellar height significantly decrease after TKA,leading to low patellar and patellar tendon shorting.
Infrapatellar fat pad
Fat pad
Patellar ligament
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