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Related Concept Videos

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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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.
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Updated: Sep 16, 2025

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The Patellofemoral Entry Point-Transition Point Angle: Digitalization and Reliability Analysis.

Johannes M Sieberer1, Nancy Park2, Shelby T Desroches2

  • 1Department of Mechanical Engineering, Yale School of Engineering and Applied Science, Yale University, New Haven, Connecticut, USA.

Orthopaedic Journal of Sports Medicine
|July 9, 2025
PubMed
Summary
This summary is machine-generated.

The entry point to transition point (EP-TP) angle is significantly higher in knees with recurrent patellofemoral instability (PFI). A digital measurement method using curvature maps improves reliability for this important metric.

Keywords:
3-dimensional (3D) analysispatellofemoral instabilitytrochlear dysplasia

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Area of Science:

  • Orthopedics
  • Biomechanics
  • Medical Imaging

Background:

  • Trochlear dysplasia is a key factor in recurrent patellofemoral instability (PFI).
  • Accurate measurement of patellar tracking is crucial for understanding PFI and guiding treatment.
  • The entry point to transition point (EP-TP) angle is a metric for patellar tracking, traditionally measured using 3D models.

Purpose of the Study:

  • To develop a digital method for measuring the EP-TP angle.
  • To assess the reliability and clinical appropriateness of this digital metric.
  • To establish cohort and interrater reliability values for the EP-TP angle measurement.

Main Methods:

  • A cohort study compared 30 knees with recurrent PFI to 30 control knees.
  • Digital measurements of the EP-TP angle were taken using anterior distal femur views and curvature maps.
  • Interrater reliability was assessed using intraclass correlation coefficients (ICCs) with and without curvature maps.

Main Results:

  • Recurrent PFI knees exhibited a significantly higher EP-TP angle (48.9°) compared to controls (11.8°).
  • The prevalence of a transition point (TP) was markedly higher in PFI patients (96.7%) than in controls (10.0%).
  • Digital measurement with curvature maps demonstrated significantly better interrater reliability (ICC=0.84) than without (ICC=0.67).

Conclusions:

  • The EP-TP angle is a significant differentiator between PFI patients and controls.
  • A digital measurement approach for the EP-TP angle is feasible and offers improved reliability, especially with curvature mapping.
  • This digital method provides a more accessible alternative to 3D model-based measurements for clinical use.