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Using a Knee Arthrometer to Evaluate Tissue-specific Contributions to Knee Flexion Contracture in the Rat
Published on: November 9, 2018
Soft tissue release in total knee arthroplasty. Cadaver study using knees without deformities.
M Matsueda1, T R Gengerke, M Murphy
1Orthopaedic Biomechanics Laboratory, Midwest Orthopaedic Research Foundation, Minneapolis, MN 55404, USA.
Clinical Orthopaedics and Related Research
|January 11, 2000
Summary
Soft tissue releases in total knee arthroplasty significantly alter knee alignment and joint gaps. Releasing the posterior cruciate ligament, regardless of the sequence, caused the greatest changes in coronal angle and tibiofemoral gap.
Area of Science:
- Orthopedic Surgery
- Biomechanics
- Anatomy
Background:
- Soft tissue releases are crucial for correcting deformities during total knee arthroplasty (TKA).
- Understanding the biomechanical impact of sequential soft tissue releases is essential for optimizing surgical outcomes.
Purpose of the Study:
- To investigate the relationship between individual soft tissue release steps and changes in tibiofemoral gaps and coronal angulation.
- To analyze medial and lateral release sequences separately in cadaveric knees.
Main Methods:
- An in vitro study using eight male and four female anatomic specimen knees.
- Medial and lateral soft tissue release sequences were performed.
- Tibiofemoral gaps were measured under distraction (53-N load) using calipers.
- Coronal angulation was measured using an optical encoder under 10 Nm varus and valgus moments in extension and 90° flexion.
Main Results:
- In the medial release sequence, anteromedial sleeve release significantly increased coronal angulation and medial gap.
- In the lateral release sequence, release of the lateral collateral ligament and popliteus tendon significantly increased coronal angle and lateral gap.
- Posterior cruciate ligament release significantly increased both angle and gap in both medial and lateral sequences.
Conclusions:
- Specific soft tissue release steps have distinct effects on knee joint biomechanics.
- Posterior cruciate ligament release appears to be a critical step influencing coronal alignment and joint gap in TKA.
- Findings are specific to the studied release sequences and cadaveric models.
