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

Condition(s) studied

Investigational drug(s) / intervention(s)

robotic arm-assisted total hip replacement: using robotic total hip replacement in patients with Legg-Calvé-Perthes disease

conventional total hip replacement: applying conventional total hip replacement in patients with Legg-Calvé-Perthes disease

Study 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.

Eligibility

Primary outcome measure(s)

• 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.

Trial sites (1)

More Second Affiliated Hospital, Zhejiang University, School of Medicine trials in China