Abstract:Objective: To explore morphological characteristics of patellofemoral joint surface of patients with patellar instability by adopting the MRI-based method.Methods: A retrospective analysis was performed from March 2016 to January 2020 to assess morphological characteristics of the patellofemoral joint surface by Magnetic Resonance Imaging (MRI) scanning knees of 30 patients (24 females, six males) with patellar instability and trochlear dysplasia and knees of 30 subjects from a randomly selected control group … Show more
“…The following were the inclusion criteria for the patellar instability group (1) recurrent patellar dislocation (≥ 3 times); (2) objective physical examination results, such as positive apprehension sign and positive J sign; and (3) imaging evidence of dislocation or subluxation confirmed using magnetic resonance imaging (MRI) and sunrise patella views). Exclusion criteria include: (1) BMI > 30 kg/m 2 ; (2) chondromalacia patella or patellofemoral arthritis; and (3) a history of knee surgery or trauma [ 15 ]. Patients in the control group consulted the orthopedic surgeon for a complaint unrelated to the patellofemoral joint, such as a slight soft tissue injury.…”
Purpose
Patellar height is a risk factor for patellar instability, correlated with the tibia length/femur length (T/F) ratio. This study aimed to explore the changes in the T/F ratio in patients with patella instability and the potential correlation with the morphology of the patellofemoral joint and extensor moment arm.
Method
A retrospective analysis was performed to assess the ratio of lower limb length morphological characteristics of the patellofemoral by full weight-bearing long-leg standing radiographs, magnetic resonance imaging, and computed tomography in 75 patients with patellar instability and 75 participants from a randomly selected control group from January 2020 to September 2021. A total of eight parts were measured, including mechanical tibia length/femur length (mT/F) ratio, anatomical tibia length/femur length (aT/F) ratio, hip–knee–ankle angle, femoral neck-shaft angle, femoral valgus cut angle, patellar height, Dejour classification, sulcus angle, trochlear angle, medial trochlear inclination, lateral trochlear inclination, patella tilt angle and patellar tendon moment arm to evaluate the difference of morphology between patient group and control groups.
Results
The mT/F (0.840 ± 0.031 vs. 0.812 ± 0.026, p < 0.001) and aT/F (0.841 ± 0.033 vs. 0.808 ± 0.028, p < 0.001) ratios in the patient group were significantly greater than that in the control group. There was a significant correlation between patellar height and increased mT/F and aT/F ratios (p < 0.05).
Conclusion
Patients with patellar instability had a larger lower limb length ratio, and the change in lower limb length ratio was correlated with patellar height.
Level of evidence IV.
“…The following were the inclusion criteria for the patellar instability group (1) recurrent patellar dislocation (≥ 3 times); (2) objective physical examination results, such as positive apprehension sign and positive J sign; and (3) imaging evidence of dislocation or subluxation confirmed using magnetic resonance imaging (MRI) and sunrise patella views). Exclusion criteria include: (1) BMI > 30 kg/m 2 ; (2) chondromalacia patella or patellofemoral arthritis; and (3) a history of knee surgery or trauma [ 15 ]. Patients in the control group consulted the orthopedic surgeon for a complaint unrelated to the patellofemoral joint, such as a slight soft tissue injury.…”
Purpose
Patellar height is a risk factor for patellar instability, correlated with the tibia length/femur length (T/F) ratio. This study aimed to explore the changes in the T/F ratio in patients with patella instability and the potential correlation with the morphology of the patellofemoral joint and extensor moment arm.
Method
A retrospective analysis was performed to assess the ratio of lower limb length morphological characteristics of the patellofemoral by full weight-bearing long-leg standing radiographs, magnetic resonance imaging, and computed tomography in 75 patients with patellar instability and 75 participants from a randomly selected control group from January 2020 to September 2021. A total of eight parts were measured, including mechanical tibia length/femur length (mT/F) ratio, anatomical tibia length/femur length (aT/F) ratio, hip–knee–ankle angle, femoral neck-shaft angle, femoral valgus cut angle, patellar height, Dejour classification, sulcus angle, trochlear angle, medial trochlear inclination, lateral trochlear inclination, patella tilt angle and patellar tendon moment arm to evaluate the difference of morphology between patient group and control groups.
Results
The mT/F (0.840 ± 0.031 vs. 0.812 ± 0.026, p < 0.001) and aT/F (0.841 ± 0.033 vs. 0.808 ± 0.028, p < 0.001) ratios in the patient group were significantly greater than that in the control group. There was a significant correlation between patellar height and increased mT/F and aT/F ratios (p < 0.05).
Conclusion
Patients with patellar instability had a larger lower limb length ratio, and the change in lower limb length ratio was correlated with patellar height.
Level of evidence IV.
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