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Related Concept Videos

Knee Joint01:23

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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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The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...
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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: Apr 24, 2026

Treatment of Ankle Osteoarthritis with Total Ankle Replacement Through a Lateral Transfibular Approach
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Are joint line changes after primary navigated total knee arthroplasty predictable?

Ahmed Jawhar1, Karolin Hutter, Hanns-Peter Scharf

  • 1Orthopaedic and Trauma Surgery Center, University Medical Center Mannheim of University Heidelberg, Theodor-Kutzer-Ufer 1-3, 68167, Mannheim, Germany, Ahmed.Jawhar@umm.de.

Journal of Orthopaedic Science : Official Journal of the Japanese Orthopaedic Association
|September 14, 2014
PubMed
Summary

Computer navigation adequately restored the joint line in total knee arthroplasty (TKA). Preoperative factors and surgical details did not predict joint line shifts of 3 mm or more.

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Surgical Navigation

Background:

  • Computer navigation in total knee arthroplasty (TKA) improves leg alignment.
  • Restoration of the anatomical joint line with computer-assisted TKA is less understood.
  • Predicting joint line changes is crucial for optimal TKA outcomes.

Purpose of the Study:

  • To evaluate the predictability of joint line changes (<3 mm vs. ≥3 mm) in computer-assisted TKA.
  • To identify pre- and intraoperative parameters influencing joint line restoration.
  • To assess the accuracy of computer navigation in joint line reconstruction.

Main Methods:

  • 180 primary computer-assisted TKA cases using a gap-balancing/tibia-first technique were analyzed.
  • Joint line shift was measured using computer verification of bone cuts.
  • Patients were grouped based on a 3-mm joint line shift threshold for statistical comparison.

Main Results:

  • The average absolute joint line shift was 1.6 ± 1.3 mm.
  • 15% of cases (28 patients) experienced a joint line shift of ≥3 mm.
  • No statistically significant correlation was found between joint line shift and analyzed preoperative or intraoperative variables.

Conclusions:

  • Computer navigation, used as a measurement tool, adequately restored the joint line in primary TKA.
  • Knee joint deformity, leg alignment, gap balance, and implant type did not predict joint line shift.
  • Careful application of navigation technology is key for accurate joint line restoration.