Femoral Rotation and Patellar Positioning After TKA

Medical University of Warsaw

Status: Completed

Conditions: Joint Pain; Knee Pain Chronic; Joint Instability; Patella Disorder; Prosthetic Complication; Knee Osteoarthritis

Treatments: Other: Use of dynamic tensioner

Study type: Observational

Funder types: Other

Identifiers

NCT05871112

WarsawMU/FRPP

Details and patient eligibility

About

Analysis of patellar positioning in the trochlear groove after TKA with and without the use of dynamic tensioner.

Full description

It appears that by precisely adjusting femoral component rotation and its relation to soft tissues in the area we can achieve better function of the patellofemoral joint and thus reduce the occurrence of anterior knee pain. Achieving proper femoral component rotation is challenging, as the bony landmarks are difficult to identify. This goal may be accomplished by using a dynamic tensioner - a device that intraoperatively measures joint gap stiffness in extension and 90 degrees flexion. This is especially important in knees with high grade arthritis and limb malalignment, where ligaments' and tendons' efficiency is affected.The aim of this study was to analyze patella positioning in the trochlear groove on CT scans of patients undergoing TKR with use of a dynamic tensioner and compare it to the ones undergoing standard measured-resection technique. Secondary outcome was to assess the frequency of anterior knee pain, range of motion and patient-reported outcome 3 and 12 months after the surgery.

Enrollment: 125 patients

Sex: All

Ages: 60 to 99 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• age over 60
• BMI < 40
• ablity to walk for 10meters
• leg length discrepancy <5mm
• knee flexion > 90 degrees
• hip extension < 0 degrees
• hip flexion > 90 degrees
• III / IV level of osteoarthritis in Kellgren - Lawrence scale

Exclusion criteria

• varus/valgus/ fixed flexion deformity > 15 degrees
• revision TKA
• prior UKA

Trial design

125 participants in 2 patient groups

Patella positioning after TKR + FUZION

Description:

Patients who underwent TKR - femoral component rotation established with a use of a dynamic tensioner (FUZION)

Treatment:

Other: Use of dynamic tensioner

Patella positioning after standard TKR

Description:

Patients who underwent standard TKR performed with measured resection technique