Increased lower limb length ratio in patients with patellar instability

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 extens...

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Bibliographic Details
Published in:Journal of orthopaedic surgery and research 2023-03, Vol.18 (1), p.221-221, Article 221
Main Authors: Wei, Maozheng, Kang, Huijun, Hao, Kuo, Fan, Chongyi, Li, Shilun, Wang, Xingkai, Wang, Fei
Format: Article
Language:English
Subjects:
Agreements
Analysis
Ankle
Arm
Arthritis
Case-Control Studies
Computed tomography
CT imaging
Extensor moment arm
Femur
Humans
Injuries
Instability
Joint Instability - pathology
Knee
Knee Joint - diagnostic imaging
Knee Joint - pathology
Lower Extremity
Lower limb length ratio
Magnetic resonance imaging
Medical imaging
Methods
Morphology
Orthopedics
Patella
Patella - anatomy & histology
Patella alta
Patellar Dislocation
Patellar instability
Patellofemoral Joint - diagnostic imaging
Patellofemoral Joint - pathology
Physical characteristics
Ratios
Retrospective Studies
Risk factors
Tibia
Tibia - diagnostic imaging
Tibia - pathology
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Summary: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. 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. The mT/F (0.840 ± 0.031 vs. 0.812 ± 0.026, p 
ISSN:1749-799X
1749-799X
DOI:10.1186/s13018-023-03720-w