Comparison of Robotic Arm-assisted THA and Conventional Manual THA in Patients With Legg-Calvé-Perthes Disease: a Prospective Cohort Study
Sponsor study identifier
interventional
50
1 country
1
Study Start
July 28, 2025
Actual (reported)Primary Completion
July 28, 2027
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
Study Completion
July 28, 2027
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
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.
Registry-reported information. Elapsed time and enrollment totals alone do not measure study progress or recruitment pace.
July 28, 2027
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
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Dates and qualifiers reported by the registry. Estimated dates do not confirm that a milestone has occurred.
July 28, 2025
Actual (reported)August 7, 2025
Actual (reported)August 14, 2025
Actual (reported)July 28, 2027
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
July 28, 2027
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
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.
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.
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.
before the surgery, 1 week after surgery, 1 month after surgery, 6 months after surgery, 1 year after surgery
operation duration
during the operation
blood loss
during the operation
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
applying conventional total hip replacement in patients with Legg-Calvé-Perthes disease
applying robotic arm-assisted total hip replacement in patients with Legg-Calvé-Perthes disease
using robotic total hip replacement in patients with Legg-Calvé-Perthes disease
applying conventional total hip replacement in patients with Legg-Calvé-Perthes disease
Second Affiliated Hospital of Zhejiang University School of Medicine
Hangzhou, Zhejiang, 310009, China
First Submitted
August 7, 2025
First Posted
August 14, 2025
Study Start
July 28, 2025
Actual (reported)Primary Completion
July 28, 2027
EstimatedThe Long Term Outcome of Varus Derotational Osteotomy for Legg-Calvé-Perthes' Disease
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Planned date reported by the registry; this milestone is not confirmed as achieved.
Study Completion
July 28, 2027
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
Last Updated
August 14, 2025
Record last verified: 2025-08
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Source: ClinicalTrials.gov.
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