An interventional study of robotic arm-assisted total hip replacement and conventional total hip replacement in Legg-Calvé-Perthes Disease, sponsored by Second Affiliated Hospital, School of Medicine, Zhejiang University. Enrolling by invitation at 1 site in China. Open to participants aged 18 Years to 80 Years. Per ClinicalTrials.gov, last updated 2025-08-14.
Sponsored by Second Affiliated Hospital, School of Medicine, Zhejiang University · Not applicable, Interventional, and Treatment
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.
31 studies on the registry are indexed under Legg-Calve-Perthes Disease; 7 are open to participants now.
This study's planned enrollment of 50 is above the median of 40 across 20 interventional studies indexed under Legg-Calve-Perthes Disease.
Browse Legg-Calve-Perthes Disease studies →Second Affiliated Hospital, School of Medicine, Zhejiang University is the lead sponsor of 1,058 studies on the registry; 511 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Exclusion Criteria:
applying conventional total hip replacement in patients with Legg-Calvé-Perthes disease
Procedure: conventional total hip replacement
applying robotic arm-assisted total hip replacement in patients with Legg-Calvé-Perthes disease
Procedure: robotic arm-assisted total hip replacement
using robotic total hip replacement in patients with Legg-Calvé-Perthes disease
applying conventional total hip replacement in patients with Legg-Calvé-Perthes disease
inclination angle
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.
Time frame: 2 days after surgery
anteversion angle
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.
Time frame: 2 days after surgery
Hospital for Special Surgery Score score (HSS score)
The maximum values is 100, and the minimum value is 0. Higher scores means a better outcome.
Time frame: before the surgery, 1 week after surgery, 1 month after surgery, 6 months after surgery, 1 year after surgery
operation duration
The operation duration (also called operative time or surgical time ) refers to the total time taken to complete a surgical procedure.
Time frame: during the operation
blood loss
The amount of blood loss during the surgery.
Time frame: during the operation
Visual Analogue Scale score (VAS score)
The maximum value is 10, and the minimum value is 0. Lower score means a better outcome.
Time frame: before the surgery, 1 week after surgery, 1 month after surgery, 6 months after surgery, 1 year after surgery
Plan to share: No
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Second Affiliated Hospital, School of Medicine, Zhejiang University