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Knee Joint

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...

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Related Experiment Video

Updated: May 27, 2026

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Published on: February 27, 2018

Squeaking after third-generation ceramic-on-ceramic total hip arthroplasty.

Rehan-Ul Haq¹, Kyung Soon Park, Jong Keun Seon

¹Center for Joint Disease, Chonnam National University Hwasun Hospital, 160, Ilsim-Ri, Hwasun-Eup, Hwasun-Gun, Jeonnam, Korea.

The Journal of Arthroplasty

|November 26, 2011

Summary

Squeaking after ceramic-on-ceramic total hip arthroplasty is uncommon. Higher body mass index, reduced acetabular angle, and limb shortening are linked to this rare complication.

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Area of Science:

Orthopedic Surgery
Biomaterials Science

Background:

Ceramic-on-ceramic bearings are used in total hip arthroplasty.
Squeaking is a rare audible complication associated with these implants.

Purpose of the Study:

To investigate the incidence and potential risk factors for squeaking in third-generation ceramic-on-ceramic total hip arthroplasty.

Main Methods:

Retrospective review of 1002 patients undergoing ceramic-on-ceramic total hip arthroplasty.
Clinical and radiological evaluation of 15 patients reporting squeaking.
Comparison with a matched control group.

Main Results:

The incidence of squeaking was 1.5% (15/1002 patients).
Patients with squeaking had significantly higher body mass index (25.8 vs 23.7 kg/m²).
Lower acetabular opening angle (34° vs 38°) and limb length shortening (>5 mm) were associated with squeaking.

Conclusions:

High body mass index, decreased acetabular opening angle, and limb length shortening are associated with squeaking in ceramic-on-ceramic total hip arthroplasty.
Flexion and sitting cross-legged were identified as movements triggering squeaking.