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Related Concept Videos

Knee Joint01:23

Knee Joint

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The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris...
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Bones of the Lower Limb: Femur and Patella01:16

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The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the...
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Using sunrise to surmise acute transient patellar dislocation.

Mitchel Misfeldt1, Samuel Hund2, Luke Frager2

  • 1Department of Radiology, The University of Kansas Medical Center, Kansas City, KS, USA. mmisfeldt@kumc.edu.

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|February 27, 2026
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Summary

Sunrise view knee radiographs can predict acute transient patellar dislocation (ATPD). Increased medial patellofemoral angle (MPFA) on the injured knee is the most accurate predictor, aiding early diagnosis and treatment planning.

Keywords:
Knee injuryRadiographsSunrise viewsTransient patellar dislocation

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Area of Science:

  • Orthopedic Surgery
  • Radiology
  • Sports Medicine

Background:

  • Acute transient patellar dislocation (ATPD) is a common knee injury.
  • Early diagnosis is crucial for effective treatment and preventing recurrent dislocations.
  • Predictive radiographic measurements can aid in timely diagnosis.

Purpose of the Study:

  • To evaluate comparative measurements on bilateral sunrise view radiographs for predicting ATPD.
  • To identify specific radiographic parameters that correlate with ATPD.

Main Methods:

  • Retrospective review of knee radiographs from patients with and without ATPD.
  • Three blinded readers assessed medial trochlea-medial patella distance (MT-MP), lateral trochlea-medial patella distance (LT-MP), and medial patellofemoral angle (MPFA).
  • Diagnostic accuracy assessed via ROC curves (AUC) and inter-reader reliability via ICC.

Main Results:

  • Increased MPFA on the injured knee was the most accurate predictor of ATPD (AUC 0.765, ICC 0.681).
  • MT-MP and LT-MP were less accurate and reliable predictors.
  • Asymmetric differences in MPFA or MT-MP were specific but not sensitive indicators.

Conclusions:

  • Comparative sunrise view radiographs can help predict ATPD with high specificity.
  • These findings can prompt earlier MRI evaluation for definitive diagnosis.
  • This approach aids in expediting treatment planning for ATPD.