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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...

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Related Experiment Video

Updated: Jun 19, 2026

Augmented Reality Navigation-Guided Core Decompression for Osteonecrosis of Femoral Head
06:17

Augmented Reality Navigation-Guided Core Decompression for Osteonecrosis of Femoral Head

Published on: April 12, 2022

Imageless computer navigation in total knee arthroplasty.

K W Cheung1, K H Chiu

  • 1Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong. kwcheung@ort.cuhk.edu.hk

Hong Kong Medical Journal = Xianggang Yi Xue Za Zhi
|October 6, 2009
PubMed
Summary
This summary is machine-generated.

Imageless computer-assisted navigation in total knee arthroplasty improves limb alignment compared to conventional methods. However, this technique results in a longer tourniquet time without increasing complications.

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Area of Science:

  • Orthopedic Surgery
  • Medical Technology

Background:

  • Total knee arthroplasty (TKA) aims to restore joint function and alignment.
  • Accurate limb alignment is crucial for long-term TKA success.
  • Conventional TKA techniques may have limitations in achieving optimal alignment.

Purpose of the Study:

  • To compare clinical and radiological outcomes of imageless computer-navigated TKA versus conventional TKA.
  • To evaluate the impact of computer navigation on limb alignment and patient function.

Main Methods:

  • Prospective case-control study involving 94 patients (47 navigated, 47 conventional).
  • Comparison of postoperative radiological alignment, tourniquet time, Knee Society scores, and range of motion.
  • Data collected from a university teaching hospital between 2003 and 2007.

Main Results:

  • Computer-assisted navigation significantly improved lower limb alignment and reduced outliers in coronal and sagittal planes.
  • Mean tourniquet time was longer in the navigated group (111 minutes) compared to the conventional group (98 minutes).
  • No significant difference in complications such as pin tract issues or infections was observed between groups.

Conclusions:

  • Imageless computer-assisted navigation enhances limb alignment accuracy in TKA.
  • While improving alignment, computer navigation increases operative time (tourniquet time).
  • Computer navigation provides valuable intraoperative guidance for limb alignment in TKA.