This is the world’s first prospective clinical study evaluating short-term outcomes of total hip arthroplasty (THA) using a product with Directed Energy Deposition (DED) porous coating technology.
Abstract
Background:
This study evaluates the short-term clinical performance of the Mirabo Z® acetabular cup, the first total hip arthroplasty (THA) implant featuring Directed Energy Deposition (DED) porous coating technology, designed to enhance osseointegration and implant stability.
Methods:
In this prospective observational study, 120 patients (124 hips) underwent cementless THA using the Mirabo Z® acetabular cup. All surgeries were performed at Seoul St. Mary’s Hospital and affiliated centers. The average follow-up duration was 34.6 months. Clinical outcomes were assessed using the Harris Hip Score, Pain Numeric Rating Scale (NRS), EQ-5D-5L, and WOMAC index. Radiographic evaluation included high-resolution CT scans to assess implant-bone interface and bone ingrowth.
Results:
Significant clinical improvement was observed postoperatively:
The implant survival rate was 99.3%, with only one revision case due to severe spinopelvic imbalance unrelated to implant performance. Radiographically, interface gaps were observed in 58.1% of cases, typically <1 mm and without clinical significance. Early bone ingrowth was confirmed in nearly all cases.
Complications included Greater Trochanteric Pain Syndrome (5.5%), squeaking (4.8%), and Iliotibial Band tightness (3.4%), all resolved with conservative management.
Conclusion:
The Mirabo Z® acetabular cup demonstrated excellent short-term clinical outcomes, high implant survivorship, and favorable radiographic performance. This study represents the first clinical validation of DED porous coating technology in THA and supports its safety and efficacy in early postoperative use.
