Patella Height Correlates With Trochlear Dysplasia: A Computed Tomography Image Analysis.

Area of Science:

• Orthopedic surgery
• Radiology
• Biomedical engineering

Background:

• Patellofemoral instability is a common orthopedic condition.
• The morphology of the femoral trochlea plays a critical role in patellar tracking.
• Understanding the relationship between patellar position and trochlear form is essential for diagnosis and treatment.

Purpose of the Study:

• To investigate the correlation between patellar position relative to the femoral trochlea and radiologic parameters of trochlear morphology.
• To determine if patellar height is associated with features of trochlear dysplasia.

Main Methods:

• Computed tomography (CT) scans of 66 patients (36 with patellofemoral instability, 30 without) were analyzed.
• Patellar height was measured as the distance between the widest patellar diameter slice and the proximal entrance of the femoral trochlea (P-TE distance).
• Correlations were calculated between P-TE distance and various radiologic parameters of trochlear dysplasia (e.g., trochlea height, depth, sulcus angle, Dejour type).

Main Results:

• A significant correlation was found between P-TE distance and all evaluated trochlear parameters.
• Higher patellar position (increased P-TE distance) was associated with more dysplastic trochlear features.
• Strongest correlations were observed with central trochlea height (r=0.490) and transverse trochlea shift (r=0.516).

Conclusions:

• Patellar height is significantly related to femoral trochlear morphology.
• A higher patellar position is indicative of a more dysplastic trochlea.
• These findings enhance the understanding of the anatomical basis of patellofemoral instability.