Is Standard 3-degree of External Rotation for Posterior Femoral Cut Relevant for Turkish Population

Study Overview
=================
Brief Summary
-----------------
The aim of this study is to evaluate the posterior condylar angle of the distal femur in Turkish population and its concordance with the current standard prosthesis designs used in total knee arthroplasty and to evaluate anthropometric features of the distal femur in the Turkish population.

Detailed Description
-----------------
The investigators would like to measure condylar twist angles(CTA), posterior condylar angles(PCA), femoral mediolateral lengths (fML), medial femoral anteroposterior lengths(fMAP), lateral femoral anteroposterior lengths (fLAP), distances between trochlear groove and fMAP(DBTG-fMAP), distances between trochlear groove and fLAP(DBTG-fLAP), medial and lateral posterior condylar cartilage thicknesses(MPCCT/LPCCT) on the Magnetic Resonance Images (MRI) of 240 knees of 120 Turkish subjects.

Official Title
-----------------
Is Standard 3-degree of External Rotation for Posterior Femoral Cut Relevant for Turkish Population: An Anthropometric MRI Study

Conditions
-----------------
Healthy

Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: non-arthritic knees, Exclusion Criteria: Patients with, intra- or extraarticular deformity on the X-rays or MRIs, history of previous extremity surgery, history of any systemic disease, a BMI of 35 or over.

Ages Eligible for Study
-----------------
Minimum Age: 18 Years
Maximum Age: 70 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
Accepts Healthy Volunteers

Study Plan
=================
How is the study designed?
-----------------
What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| condylar twist angle and posterior condylar angle | The condylar twist angle (CTA) is an angle between anatomical transepicondylar axis (TEA),which lying from medial epicondyle to lateral epicondyle of the distal femur, and posterior condylar axis (PCAx). The posterior condylar angle (PCA) is an angle between surgical TEA, which lying from medial epicondylar sulcus to lateral epicondyle, and PCAx[1]. | about 5 days | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| mediolateral lenght of the distal femur (fML) | The widest mediolateral lenght of the distal femur (fML) in the axial plane which equal to transepicondylar axis | about 5 days | 
| medial anteroposterior lengt (fMAP) and lateral anteroposterior lengt (fLAP) | the longest anteropesterior distances of the medial and lateral condyles over the cartilage tissue od the distal femur on the axial images[2]. | about 5 days | 
| Distance between trochlear groove and fMAP (DBTG-fMAP) and distance between trochlear groove and lateral fAP(DBTG- fLAP) | MRI sections obtained 3 cm above the tibiofemoral joint will use for evaluation of deepest point of the trochlear groove.The distance between trochlear groove to fMAP and fLAP | about 5 days | 
| Medial and lateral posterior condylar cartilage thicknesses (MPCCT/LPCCT) | MPCCT/LPCCT were measured at the deepest point in the axial plan. | about 5 day | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
posterior condylar angle, total knee arthroplasty, external rotation, anthropometric measurements, 3 degrees, Turkish population