Robotic Arm-assisted THA Vs. Conventional THA in Legg-Calvé-Perthes Disease

Not Applicable

• Conditions: Legg-Calvé-Perthes Disease

• Registration Number: NCT07122323
• Lead Sponsor: Second Affiliated Hospital, School of Medicine, Zhejiang University

Brief Summary

Flat hip, also called Legg-Calvé-Perthes disease, is clinically characterized by flattened femoral head, shortened femoral neck, and a center of rotation of the femoral head lower than the apex of the greater trochanter. Joint replacement is difficult, with high intraoperative and postoperative complications. Especially, issues such as unequal limb length, postoperative dislocation, postoperative neurological damage, and prosthesis impact have always plagued clinical practice.

The robotic arm-assisted joint replacement technology has been developed and clinically applied for over 10 years, but it was not until the past 3 years that it began to be widely implemented worldwide. Existing research data indicates that robotic arm-assisted joint replacement technology can significantly improve the placement of prostheses and lower limb force lines in patients, and improve their short-term clinical prognosis. However, its application in complex hips, such as flat hip, is limited. More relevant literature is needed to further enrich people's understanding of this technology. In theory, robot assisted technology can solve many challenges faced in flat hip replacement.

Detailed Description

Not available

Study Timeline

• Study Start: 2025-07-28
• Status Verified: 2025-08
• Study First Submitted: 2025-08-07
• Study First Submitted QC: 2025-08-13
• Last Update Submitted: 2025-08-13
• Study First Posted: 2025-08-14
• Last Update Posted: 2025-08-14
• Primary Completion: 2027-07-28
• Study Completion: 2027-07-28

Recruitment & Eligibility

• Status: ENROLLING_BY_INVITATION
• Sex: All
• Target Recruitment: 50

Inclusion Criteria

• patients with Legg-Calvé-Perthes disease and accept total hip replacement in our center

Exclusion Criteria

• infection, cannot complete follow-up

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Primary Outcome Measures

Name	Time	Method
inclination angle	2 days after surgery	The inclination angle in total hip replacement (THR), also called the abduction angle , refers to the angle at which the acetabular cup component is tilted relative to the horizontal plane when viewed on an anteroposterior (AP) pelvic X-ray.
anteversion angle	2 days after surgery	The anteversion angle in total hip replacement (THR) refers to the forward tilt (rotation) of the acetabular cup component around its vertical axis. It determines whether the cup's opening faces more forward or backward relative to the pelvis.
Hospital for Special Surgery Score score (HSS score)	before the surgery, 1 week after surgery, 1 month after surgery, 6 months after surgery, 1 year after surgery	The maximum values is 100, and the minimum value is 0. Higher scores means a better outcome.

Secondary Outcome Measures

Name	Time	Method
operation duration	during the operation	The operation duration (also called operative time or surgical time ) refers to the total time taken to complete a surgical procedure.
blood loss	during the operation	The amount of blood loss during the surgery.
Visual Analogue Scale score (VAS score)	before the surgery, 1 week after surgery, 1 month after surgery, 6 months after surgery, 1 year after surgery	The maximum value is 10, and the minimum value is 0. Lower score means a better outcome.

Trial Locations

Locations (1)

Second Affiliated Hospital of Zhejiang University School of Medicine; 🇨🇳 Hangzhou, Zhejiang, China