The Correlation Between Femoral Component Implanting Flexion Angle and Posterior Condyle Offset in Cruciate Retaining Total Knee Arthroplasty

• Conditions: Knee Osteoarthritis
• Interventions: Procedure: total knee arthroplasty

• Registration Number: NCT05477745
• Lead Sponsor: RenJi Hospital

Brief Summary

The main aim and scope is making measurement and comparison about the femoral component posterior offset under different femoral component implanting flexion angle in cruciate retaining total knee arthroplasty. The results may identify the influence of the flexion component implanting flexion angle on the femoral component posterior offset.

Detailed Description

Not available

Study Timeline

• Status Verified: 2022-07
• Study First Submitted: 2022-07-25
• Study First Submitted QC: 2022-07-27
• Last Update Submitted: 2022-07-27
• Study First Posted: 2022-07-28
• Last Update Posted: 2022-07-28
• Study Start: 2022-07-29
• Primary Completion: 2022-08-15
• Study Completion: 2022-08-22

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 200

Inclusion Criteria

• The patients undertaken the primary cruciate retaining total knee arthroplasty;
• using the curiate retaining total knee arthroplasty prothesis from Biomet and Smith&Nephew;
• Complete surgery documents and radiologic data,such as standard X-ray postoperative both at antirior-posterior position and medial-lateral position(overlap of the medial and lateral femoral condyle).

Exclusion Criteria

• The patients without standard X-ray postoperative both at antirior-posterior position and medial-lateral position(poor overlap of the medial and lateral femoral condyle);
• Complex primary total knee arthroplasty, using extra component such as trabecular metal,stem or et al.

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
The group that the sagittal flexion angle of the femoral component less than 4°	total knee arthroplasty	The patients' knees were taken on the X-ray examination after the total knee arthroplasty on the medial-lateral position. The flexion (positive degree) or extension (negative degree) angle of the femoral component according to the anterior femoral cortex was measured. The patients with the sagittal flexion angle of the femoral component less than 4° were categorized into this group.
The group that the sagittal flexion angle of the femoral component over 4°	total knee arthroplasty	The patients' knees were taken on the X-ray examination after the total knee arthroplasty on the medial-lateral position. The flexion (positive degree) or extension (negative degree) angle of the femoral component according to the anterior femoral cortex was measured. The patients with the sagittal flexion angle of the femoral component over 4° were categorized into this group.

Primary Outcome Measures

Name	Time	Method
Posterior Femoral Offset Ratio	1 week after the surgery	The posterior femoral offset ratio was defined as the maximal thickness of the posterior condyle projecting posteriorly to a straight line drawn as the extension of the posterior femoral shaft cortex, divided by the maximal thickness of the posterior condyle projecting posterior to a straight line drawn as the extension of the anterior femoral shaft contex on the medial-lateral position of the X-ray examination.
Posterior Femoral Offset	1 week after the surgery	The posterior femoral offset was defined as the maximal thickness of the posterior condyle projecting posteriorly to a straight line drawn as the extension of the posterior femoral shaft cortex on the medial-lateral position of the X-ray examination.