Effectiveness of Inertial Sensors vs the Conventional Technique for the Execution of the Bone Resections in Primary TKA

Evaluation of the Effectiveness of a Technique Based on Inertial Sensors vs the Conventional Technique for the Execution of the Bone Resections in Primary Total Knee Arthroplasty: a Controlled Randomized Trial

Comparison of surgical technique for the execution of bone resections in total knee arthroplasty.

Used technique are: a non-invasive extramedullary technique (EM technique) based on the use of inertial sensors for cutting guides positioning and conventional technique (IM technique), based on the use on intramedullary stem.

Our hypothesis is that the EM technique based on the use of inertial sensors leads to a reduction in the number of outliers equal to or greater than 20% compared to the outliers obtained with the conventional technique.

Study Overview

• Status: Completed
• Conditions: Knee Osteoarthritis
• Intervention / Treatment: Procedure: Total knee replacement

Detailed Description

Comparison of surgical technique for the execution of bone resections in total knee arthroplasty.

Used technique are: a non-invasive extramedullary technique (EM technique) based on the use of inertial sensors for cutting guides positioning and conventional technique (IM technique), based on the use on intramedullary stem. A study was carried out at the Rizzoli Orthopedic Institute in 2016 to compare non-invasive extramedullary technique (EM technique) and conventional technique (IM technique). Starting from the results obtained in the previous study, the objective of this study is to deepen the investigations to evaluate the effectiveness of the EM technique compared to the conventional IM technique.

The patients involved in the study will be divided into two groups based on the alignment technique used (EM technique and IM technique).

The results obtained will be measured on postoperative panoramic radiographs at discharge, assessing the overall alignment of the limb and the individual femoral and tibial components in terms of accuracy and repeatability according to a defined measurement protocol.

Primary endpoint:

- reduction in the number of cases in which the alignment error on the coronal plane is greater than 3°of error (outlier). Our hypothesis is that the EM technique based on the use of inertial sensors leads to a reduction in the number of outliers equal to or greater than 20% compared to the outliers obtained with the conventional technique.

Secondary endpoints:

• the reduction of the variation in hemoglobin levels during hospitalization. Our hypothesis is that the EM technique leads to a reduction in the maximum variation of hemoglobin levels during the hospitalization period compared to the IM technique equal to or greater than 1g / dl
• reduction of alignment errors of the femoral and tibial resections obtained with the EM technique and with the IM technique on the sagittal plane. In particular, the experimental hypothesis is that in the EM technique group, values of alignment of the implant with respect to the femoral and tibial mechanical axis on the sagittal plane are not significantly lower than those obtained with the standard technique but with a reduction in the standard deviation in the EM group compared to the IM group.
• reduction of the period of hospital stay in the EM group compared to the group operated with the standard technique.
• inter-operator variability in the EM group Randomized controlled multicenter prospective study. The evaluation of the results obtained will be blinded by an examiner with adequate clinical skills and who does not take part in the operational phases of the study.

Duration: 36 months The patients will be divided into 2 groups, based on the alignment technique used Total number of patients involved: 180 (90 Group A Patients: EM Technique), (90 Group B Patients: IM Technique) Total number of centers involved: 3 Patients per Center: 30 Group A Patients, 30 Group B Patients Patients will be randomized. The randomization list will be generated using the website www.randomization.com. This list will be kept at the Operative Unit Orthopedic and Traumatological Clinic 2nd and will not be visible to the investigators involved The evaluation of the results obtained will be carried out blindly by an examiner with adequate clinical skills to carry out the evaluation and who does not take part in the operational phases of the study.

For both groups of patients, the results obtained will be measured on postoperative panoramic radiographs performed at discharge, assessing in terms of accuracy and repeatability.

Finally, within Group A, the inter-operator variability of the measurement of the final femoral and tibial alignment obtained using the Blant & Altman analysis method will be assessed

The study involves the collection of data in three different phases:

Preoperative phase:

• Panoramic radiography under weight-bearing of the lower limbs in A-P and radiography of the knee in lateral projection
• laboratory value of hemoglobin

Intraoperative phase:

• Time of application of the ischemic snare;
• Surgery time;
• Final femoral and tibial alignment. In Group A the acquisition is repeated 2 times by two operators.
• Number of repetitions of distal femoral and tibial resections;
• Possible administration of blood products;
• Blood loss;

Post-operative phase

• Panoramic X-ray under weight-bearing of the lower limbs in A-P and knee radiography in lateral projection (at discharge)
• laboratory value of the patient's hemoglobin on each day until the date of discharge
• possible administration of blood products
• hospitalization times All data will be collected in a data collection form associated with the patient.

The preoperative and postoperative radiographs (made anonymous) and the data collection form will be sent to the coordinating center which will carry out the measurements.

From the literature it emerges that in order to detect a difference between the two techniques of 20% on the number of outliers (alignment of the components >±3°on the coronal plane) with an alpha type error (level of significance) equal to 0.05 and a power of at least 0.8, the minimum number of samples needed per group is 82 cases. Considering a 10% drop out, a sample of 90 cases per group is expected (divided into 3 centers for a total of 30 cases per group in each center)

• Study Type: Interventional
• Enrollment (Actual): 180
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Italy
  • Bologna, Italy, 40136
    • IRCCS Istituto Ortopedico Rizzoli

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 40 years to 80 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• patients candidated for total knee arthroplasty
• hip mobility range of at least 30 °
• BMI <35kg / m2
• Aged between 40 and 80 years

Exclusion Criteria:

• ipsilateral hip arthrodesis or ankylosis
• non-perforable femoral medullary canal
• 165 °<HKA <195 °
• BMI> 35kg / m2

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Supportive Care
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Single

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: EM Technique; use of extramedullary technique by means of inertial sensors for the execution of femoral cuts	Procedure: Total knee replacement; Total knee arthroplasty using standard anterior approach. In the EM group, inertial sensor will be used to perform femoral bone cuts. In the IM group, conventional intramedullary nail will be used as reference to perform femoral bone cuts.
Active Comparator: IM Technique; Use of conventional intramedullary technique for the execution of femoral cuts	Procedure: Total knee replacement; Total knee arthroplasty using standard anterior approach. In the EM group, inertial sensor will be used to perform femoral bone cuts. In the IM group, conventional intramedullary nail will be used as reference to perform femoral bone cuts.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Reduction in the number of cases in which the alignment error on the coronal plane is greater than 3°of error (outlier).	HKA alignment on the coronal plane (medial angle between the femoral mechanical axis and the tibial mechanical axis); coronal femoral angle (medial angle between the femoral mechanical axis and the tangent to the distal condyles of the femoral prosthetic component; tibial coronal angle (medial angle between the tibial mechanical axis and the tangent to the proximal profile of the tibial component) The number of patients with an HKA angle such that 180°-3°> HKA> 180°+ 3°or 180°-2°> HKA> 180°+ 2°will also be evaluated	22 months

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Reduction of the variation in hemoglobin levels during hospitalization.	The maximum variation of hemoglobin during the period of hospitalization will also be assessed within each group by comparing the hemoglobin value at the time of hospitalization with the hemoglobin values during the post-operative hospital stay	22 months
Reduction of alignment errors of the femoral and tibial resections obtained with the EM technique and with the IM technique on the sagittal plane	Sagittal femoral angle (angle between the mechanical femoral axis on the sagittal plane and the distal femoral resection plane) Tibial slope (angle between the tibial mechanical axis on the sagittal plane and the tangent to the proximal profile of the tibial component)	22 months
Reduction of the period of hospital stay in the EM group compared to the group operated with the standard technique	Hospital stay will be measured in day of hospitalization	22 months
Inter-operator variability in the EM group	The inter-operator variability of the measurement of the final femoral and tibial alignment obtained using the Blant & Altman analysis method will be assessed	22 months

Collaborators and Investigators

• Sponsor: Istituto Ortopedico Rizzoli
• Investigators: Principal Investigator: Giulio Maria Marcheggiani Muccioli, MD, PhD, IRCCS Rizzoli Orthopedic Institute

Study record dates

Study Major Dates

• Study Start (Actual): September 18, 2019
• Primary Completion (Actual): May 26, 2023
• Study Completion (Actual): May 26, 2023

Study Registration Dates

• First Submitted: January 20, 2020
• First Submitted That Met QC Criteria: January 24, 2020
• First Posted (Actual): January 27, 2020

Study Record Updates

• Last Update Posted (Actual): May 31, 2023
• Last Update Submitted That Met QC Criteria: May 29, 2023
• Last Verified: May 1, 2023

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Joint Diseases; Musculoskeletal Diseases; Rheumatic Diseases; Arthritis; Osteoarthritis; Osteoarthritis, Knee
• Other Study ID Numbers: TKA_EM2

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No