Clinical trial NCT03622034: Knee Posterior Femoral Condylar Offset and Tibial Slope of the Egyptian Population
Official title: Knee Posterior Femoral Condylar Offset and Tibial Slope of the Egyptian Population
Study type: OBSERVATIONAL
Overall status: UNKNOWN
Conditions: Changes in Knee Measurements Between Egyptian and Western Population
Keywords: knee features
ethnic changes
Lead sponsor: Assiut University
Sponsor class: OTHER
First posted: 2018-08-09
Enrollment: 300
Sex: ALL
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Observational model: ECOLOGIC_OR_COMMUNITY
Time perspective: RETROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: all adult cases who have proper lateral knee x ray on the registery system of Assiut University Hospital , will be collected. These x rays will be used in this study as posterior condylar offset, posterior condylar offset ratio and tibial slope will be measured on these x rays

Brief summary: this study is to compare the posterior condylar offset , posterior condylar offset ratio and tibial slope of Egyptian population with Asian and Western results.These results may be important to examine if contemporary total knee arthroplasty components match the anatomy of Egyptian populations or they are significantly different with the need of different prosthesis designs and geometrics.

Detailed description: Lateral knee x rays will be collected from the registry system of Assiut University Hospital through Paxera pacs system . Posterior condylar offset, posterior condylar offset ratio and tibial slope will be measured from the x rays.

In the sagittal plane, the femoral long axis will be drawn with equal distance to the anterior-posterior edges of the femoral shaft. One line will be drawn parallel to the anterior femoral shaft cortex and another parallel to the posterior femoral shaft cortex. A third line will be drawn parallel to the posterior femoral shaft cortex line, but tangent to the most posterior femoral condyles to represent the posterior condylar tangent line. The anterior-posterior dimension of the distal femur is defined as the distance between the anterior femoral shaft cortex line and the posterior femoral condyle tangent line . The posterior femoral condyle offset (PCO) is determined as the distance between the posterior femoral shaft cortex line and the posterior femoral condyle line, that is noted as PCO .The posterior femoral condyle offset ratio (PCOR) is calculated as the ratio of the posterior femoral condyle offset and the anterior-posterior dimension of the distal femur, i.e., PCO/ACP.

Tibial slope will be measured as follows; the tangent to the medial tibial plateau is considered to be the proximal reference line. This is the line connecting the highest anterior and posterior points of the medial plateau. The second reference is the axis of the tibia, defined as a line through the middle of the shaft at 10 and 20 cm. The angle between these two lines is the tibial slope.

Data of the cases will be collected as name, age and gender. The results will be collected and will be compared with those of Asian and Western results. These results may be important to examine if contemporary TKA components match the anatomy of Egyptian populations or they are significantly different with the need of different prosthesis designs and geometrics.

Eligibility criteria: Inclusion Criteria:

* Proper lateral knee x ray of adult cases

Exclusion Criteria:

* 1. Improper x ray projection
* 2. Retained hardware
* 3. Malunited distal or upper tibia fracture

Primary outcomes:
measure: Measure posterior condylar offset in the Egyptian population
timeFrame: one year
Secondary outcomes:
Other outcomes:
Locations:
Study officials:
References:
citation: Kwak DS, Tao QB, Todo M, Jeon I. Determination of representative dimension parameter values of Korean knee joints for knee joint implant design. Proc Inst Mech Eng H. 2012 May;226(5):368-76. doi: 10.1177/0954411912442025.
citation: Mahfouz M, Abdel Fatah EE, Bowers LS, Scuderi G. Three-dimensional morphology of the knee reveals ethnic differences. Clin Orthop Relat Res. 2012 Jan;470(1):172-85. doi: 10.1007/s11999-011-2089-2.
citation: Bellemans J, Carpentier K, Vandenneucker H, Vanlauwe J, Victor J. The John Insall Award: Both morphotype and gender influence the shape of the knee in patients undergoing TKA. Clin Orthop Relat Res. 2010 Jan;468(1):29-36. doi: 10.1007/s11999-009-1016-2. Epub 2009 Aug 8.
citation: Conley S, Rosenberg A, Crowninshield R. The female knee: anatomic variations. J Am Acad Orthop Surg. 2007;15 Suppl 1:S31-6. doi: 10.5435/00124635-200700001-00009.
citation: DiBennardo R, Taylor JV. Sex assessment of the femur: a test of a new method. Am J Phys Anthropol. 1979 May;50(4):635-7. doi: 10.1002/ajpa.1330500415.
citation: Leszko F, Hovinga KR, Lerner AL, Komistek RD, Mahfouz MR. In vivo normal knee kinematics: is ethnicity or gender an influencing factor? Clin Orthop Relat Res. 2011 Jan;469(1):95-106. doi: 10.1007/s11999-010-1517-z.
citation: Abdelnasser MK, Khalifa AA, Bassem M, Abdelhameed MA, Adam MF, Bakr HM, Khalifa YE. Anthropometric measurements of non-arthritic knees in an Egyptian population: an MRI-based study. J Orthop Surg Res. 2021 Sep 8;16(1):552. doi: 10.1186/s13018-021-02708-8.