The Influence of Coronally Knee Alignment on the Tibial Tuberosity Rotation
The Relationship of Radiological Lower Limb Alignment and Grade of the Knee Osteoarthritis With the Position of the Tibial Tuberosity
Study Overview
Detailed Description
A malalignment of the tibial component is a possible source of pain after a total knee arthroplasty. Currently, an internal rotation of the tibial component of 18 degrees is considered as a golden standard. The value was obtained as an average rotation in the osteoarthritic knees scheduled for a total knee arthroplasty.
It is known that the femur internally rotates with the increasing valgus alignment. It would seem logical that also tibial rotation correlates with the coronal limb alignment (varus-valgus). The plan is to measure the native tibial rotation (angle between the transposed epicondylar line and the posterior cruciate-tibial tuberosity line). In order to get the necessary accuracy a CT of lower legs will be obtained in patients waiting for the knee replacement. If there is a correlation between the angles the adjustment of the tibial component rotation more to the patient's anatomy could be proposed.
A secondary outcome measure is the possible correlation between the proximal femoral anteversion and the tibial tuberosity rotation. The hypothesis is that the extensor mechanism follows the proximal femoral orientation. With increasing femoral anteversion (increases with valgus angle) the femoral part of the knee rotates internally. In order to keep the extensor mechanism in the direction of walking, a more lateralized position of the tibial tuberosity is expected.
Study Type
Enrollment (Actual)
Contacts and Locations
Study Locations
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Ankaran, Slovenia, 6820
- Orthopaedic Hospital Valdoltra
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
- Child
- Adult
- Older Adult
Accepts Healthy Volunteers
Sampling Method
Study Population
Description
Inclusion Criteria:
- patients requiring knee arthroplasty
Exclusion Criteria:
- women in reproductive age, patients with leg deformities and previous hip/knee surgery
Study Plan
How is the study designed?
Design Details
- Observational Models: Case-Only
- Time Perspectives: Prospective
Cohorts and Interventions
Group / Cohort |
Intervention / Treatment |
|---|---|
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Group
A CT scan of both legs will be made in patient scheduled for a primary knee arthroplasty.
No other additional intervention will be made apart from those already routinely used for the operation.
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CT of lower leg
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
|---|---|---|
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Correlation between coronal alignment and tibial tuberosity rotation
Time Frame: Before surgery
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A hip-knee-ankle angle and a tibial rotation angle (angle between the transposed epicondylar line) will be calculated from the CT scan of the leg.
A correlation between both angles will be analysed using the Spearmans's coefficient.
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Before surgery
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
|---|---|---|
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Correlation between femoral anteversion and tibial tuberosity position
Time Frame: Before surgery
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A femoral anteversion angle (angle between femoral hip neck and posterior condylar knee line) and tibial tuberosity position (angle between posterior condylar line and posterior cruciate - tibial tuberosity line) will be measured and examined for correlation using a Spearman's coefficient.
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Before surgery
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Difference in tibial tuberosity position according to the osteoarthritis grade
Time Frame: Before surgery
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Tibial tuberosity position will be compared according to the Kellgren-Lawrence grade with the ANOVA
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Before surgery
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Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Andrej Strahovnik, Valdoltra Orthopaedic Hospital
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- Valdoltra - TT rotation
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
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