What question did this study set out to answer?

To develop a simple, accurate, and reproducible axial roentgenographic technique for the knee and establish a quantitative index of patellofemoral congruence.

October 1, 1974Journal of Bone and Joint Surgery

Roentgenographic Analysis of Patellofemoral Congruence

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To develop a simple, accurate, and reproducible axial roentgenographic technique for the knee and establish a quantitative index of patellofemoral congruence.
Positioned supine subjects with knees flexed 45 degrees over the table end and legs supported.
Directed the central x-ray beam downward at 30 degrees from the horizontal perpendicular to a film cassette placed distal to the patellae.
Formulated the congruence angle measuring patellar articular ridge position relative to the intercondylar sulcus in 100 normal subjects (N=100).
Established the congruence angle as a standardized radiographic measure of patellofemoral joint alignment.
Identified that lateral subluxation of the patella greater than 16 degrees is abnormal at the 95th percentile in 100 normal subjects.

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Implication

Observational study reveals normal patellofemoral congruence angles in 100 healthy knees, indicating that lateral subluxation beyond 16 degrees represents an abnormal threshold.

Cite This Study

Merchant et al. (1974) studied this question.

synapsesocial.com/papers/69d8113d5c3030ff03d1904e https://doi.org/10.2106/00004623-197456070-00007

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Implication

Observational study reveals normal patellofemoral congruence angles in 100 healthy knees, indicating that lateral subluxation beyond 16 degrees represents an abnormal threshold.

Roentgenographic Analysis of Patellofemoral Congruence

Key Points

Discussion

Implication

Cite This Study

Roentgenographic Analysis of Patellofemoral Congruence

Key Points

Discussion

Implication

Cite This Study

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