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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...

Kinematic Equations for Rotation

Kinematic Equations for Rotation

In mechanics, when one observes a rigid body in rotational motion with constant angular acceleration, it is possible to establish equations for its rotational kinematics. This process resembles how linear kinematics are dealt with in simpler motion studies.
For instance, imagine a point A on a rigid body engaged in circular motion. The translational velocity of this particular point can be calculated by taking the time derivatives of the displacement equation, which essentially measures the...

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Updated: Sep 24, 2025

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

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Published on: February 27, 2018

Inverse Kinematic Alignment for Total Knee Arthroplasty.

Philip Winnock de Grave¹, Jonas Kellens², Thomas Luyckx³

¹AZ Delta Roeselare, Department Orthopaedic Surgery, Roeselare, Belgium; KU Leuven, Department Rehabilitation Sciences, Brugge, Belgium.

Orthopaedics & Traumatology, Surgery & Research : OTSR

|May 5, 2022

Summary

Inverse kinematic alignment (iKA) is a novel patient-specific technique for total knee arthroplasty (TKA). This tibia-first approach shows excellent short-term outcomes and patient satisfaction, potentially improving long-term results.

Keywords:

Alignment Inverse kinematic alignment Knee osteoarthritis Robotic surgery Surgical technique Total knee replacement

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Last Updated: Sep 24, 2025

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

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Published on: May 5, 2023

Area of Science:

Orthopedic Surgery
Biomechanical Engineering
Robotic-Assisted Procedures

Background:

Patient-specific alignment in total knee arthroplasty (TKA) may enhance clinical outcomes.
Existing alignment concepts have theoretical benefits and potential drawbacks.
Inverse kinematic alignment (iKA) is an emerging patient-specific alignment strategy.

Purpose of the Study:

To describe the surgical technique of inverse kinematic alignment (iKA) for TKA.
To assess bony resections and angles in a case series of iKA procedures.
To evaluate the potential advantages of iKA over traditional alignment methods.

Main Methods:

Surgical technique description of iKA using a robotic-assisted system (Mako).
Tibia-first, gap balancing approach restoring native tibial joint line obliquity (JLO).
Assessment of 100 consecutive iKA cases, reporting bony resections and angles.

Main Results:

iKA involves equal medial and lateral tibial resections to compensate for bone and cartilage loss.
The technique was successfully applied using robotic assistance.
Detailed analysis of bony resections and resection angles in the coronal and axial planes was performed.

Conclusions:

iKA demonstrates excellent short-term clinical outcomes and high patient satisfaction.
This patient-specific alignment may offer advantages in both coronal and axial planes.
iKA holds potential for optimal clinical outcomes and durable long-term survival in TKA.