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Related Concept Videos

Knee Joint01:23

Knee Joint

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 group...
Bones of the Lower Limb: Femur and Patella01:16

Bones of the Lower Limb: Femur and Patella

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 neck...

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Related Experiment Video

Updated: Jun 5, 2026

Anterior Cruciate Ligament Transection and Synovial Fluid Lavage in a Rodent Model to Study Joint Inflammation and Posttraumatic Osteoarthritis
06:28

Anterior Cruciate Ligament Transection and Synovial Fluid Lavage in a Rodent Model to Study Joint Inflammation and Posttraumatic Osteoarthritis

Published on: September 2, 2025

Knee joint effusion following ipsilateral hip surgery.

A G Christodoulou1, P Givissis, P D Antonarakos

  • 11st Orthopaeidc Department, General Hospital G Papanikolaou, Exoxi, Thessaloniki, Greece. an.christodoulou@gmail.com

Journal of Orthopaedic Surgery (Hong Kong)
|December 29, 2010
PubMed
Summary

Hip surgery trauma can lead to patellar reflex inhibition and subsequent knee joint effusion. This study found a positive correlation between these two conditions following various hip surgical procedures.

Related Experiment Videos

Last Updated: Jun 5, 2026

Anterior Cruciate Ligament Transection and Synovial Fluid Lavage in a Rodent Model to Study Joint Inflammation and Posttraumatic Osteoarthritis
06:28

Anterior Cruciate Ligament Transection and Synovial Fluid Lavage in a Rodent Model to Study Joint Inflammation and Posttraumatic Osteoarthritis

Published on: September 2, 2025

Area of Science:

  • Orthopedic Surgery
  • Neuromuscular Physiology
  • Biomedical Engineering

Background:

  • Hip surgery is a common procedure for fractures and osteoarthritis.
  • Post-operative complications can include pain and reduced mobility.
  • The relationship between surgical trauma and neuromuscular responses requires further investigation.

Purpose of the Study:

  • To investigate the correlation between patellar reflex inhibition and knee joint effusion after hip surgery.
  • To analyze the temporal relationship between these two post-operative phenomena.

Main Methods:

  • 105 patients (65 women, 40 men; aged 45-75) underwent hip surgery (hip fracture fixation or hip replacement).
  • Knee joint effusion, patellar reflex, and thigh circumference were measured pre- and post-operatively (days 0.5-45).
  • Time-sequence plots and correlation analyses were employed to assess relationships.

Main Results:

  • Patellar reflex inhibition peaked on post-operative day 0.5, preceding knee joint effusion and thigh circumference increase (day 2).
  • A significant positive correlation (r=0.843, p=0.035) was observed between patellar reflex inhibition and knee joint effusion.
  • This correlation was significant across all three surgical approaches studied.

Conclusions:

  • Surgical trauma associated with hip procedures can induce patellar reflex inhibition.
  • This reflex inhibition appears to be a precursor to the development of knee joint effusion.
  • Understanding this sequence may inform post-operative management strategies.