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Related Concept Videos

Bones of the Lower Limb: Femur and Patella01:16

Bones of the Lower Limb: Femur and Patella

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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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Related Experiment Video

Updated: Jan 12, 2026

Author Spotlight: Exploring the Complexities of Achilles Tendon Injuries &#8212; Research and Future Directions
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The Fixed Patella Test: A Reliable and Accurate Test for Detecting Quadriceps Tendon Rupture.

Arifur Rahman1, Ahmed Ashour2, Ahmed Hamed2

  • 1Trauma and Orthopaedics, Walsall Healthcare NHS Trust, Walsall, GBR.

Cureus
|November 3, 2025
PubMed
Summary
This summary is machine-generated.

The novel fixed patella test accurately detects quadriceps tendon ruptures with 100% sensitivity. This simple, non-invasive clinical maneuver aids in timely diagnosis and treatment of extensor mechanism injuries.

Keywords:
diagnosticfixed patella testpatellaquadriceps tendontendon rupture

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Area of Science:

  • Orthopedic surgery
  • Musculoskeletal imaging
  • Trauma care

Background:

  • Delayed diagnosis of quadriceps tendon rupture negatively impacts patient outcomes.
  • Standard clinical tests for quadriceps tendon rupture can be limited by patient factors like pain and swelling.
  • A novel, non-invasive clinical maneuver, the fixed patella test, has been developed to assess quadriceps tendon integrity.

Purpose of the Study:

  • To evaluate the diagnostic performance of the fixed patella test in routine clinical practice for suspected quadriceps tendon ruptures.
  • To assess the test's sensitivity, specificity, and predictive values in a real-world clinical setting.

Main Methods:

  • A prospective service evaluation was conducted across multiple sites at a UK trauma center.
  • Patients with suspected extensor mechanism injuries underwent the fixed patella test during routine clinical evaluation.
  • The test involves assessing patellar mobility during isometric quadriceps contraction, with a mobile patella indicating rupture. Diagnosis was confirmed with ultrasound, MRI, or surgical findings.

Main Results:

  • The fixed patella test demonstrated high diagnostic accuracy (93.5%) in 31 knees across 30 patients.
  • Sensitivity was 100%, negative predictive value was 100%, and positive predictive value was 93.1%.
  • Specificity was 50%, and all positive tests correctly identified complete or high-grade partial ruptures.

Conclusions:

  • The fixed patella test is a highly sensitive, simple, and well-tolerated clinical tool for diagnosing quadriceps tendon ruptures.
  • This test requires no specialized equipment and can potentially expedite diagnosis and surgical intervention.
  • Further validation in larger patient cohorts is ongoing to solidify its clinical utility.