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Opening wedge high tibial osteotomy using 3D biomodelling Bonelike macroporous structures: case report.
M Gutierres1, A G Dias, M A Lopes
1FMUP - Faculdade de Medicina da Universidade do Porto, Hospital de São João, Largo Hernâni Monteiro, Porto 4200, Portugal.
This case report describes the use of a new 3D biomodelled calcium phosphate material in high tibial osteotomy for medial compartment osteoarthritis. The material, called Bonelike, was compared to a conventional HA/beta-TCP biphasic material. Both were implanted in patients with varus knees. After 4 months, both materials showed good integration and mechanical resistance. No inflammatory reactions were observed. The left knee achieved a 10-degree valgus correction, while the right knee had a 6-degree correction. The International Knee Score indicated good functional outcomes, with full range of motion and minimal pain. The study suggests that 3D biomodelled materials may offer viable alternatives to bone grafts, but further research is needed.
Area of Science:
- Orthopedic surgery techniques
- Biomaterials in musculoskeletal repair
Background:
Medial compartment osteoarthritis in varus knees remains a clinical challenge. Current treatments rely on bone grafts, which carry donor site risks and limited availability. Alternative grafting materials are needed to improve outcomes. Prior research has shown that synthetic calcium phosphates can support bone regeneration. However, no prior work had resolved how 3D biomodelled structures compare with conventional foaming methods. This gap motivated the exploration of a computer-controlled synthetic material. The study aimed to test whether such a material could achieve similar integration and mechanical stability. No prior study had evaluated this specific 3D architecture in osteotomy settings. The need for non-inflammatory, structurally stable grafts remains unmet.
Purpose Of The Study:
The study aimed to evaluate a new 3D biomodelled calcium phosphate in high tibial osteotomy. The specific problem addressed was the need for alternatives to bone autografts and allografts. The motivation came from limitations in current grafting options. The goal was to assess how well the new material integrates and supports mechanical resistance. The study also aimed to compare it with a conventional biphasic material. The focus was on post-operative inflammation and structural stability. The researchers proposed that the 3D architecture might improve graft performance. The study sought to determine whether this material could support valgus correction in osteoarthritis.
Main Methods:
The study used two synthetic calcium phosphate materials in porous wedge shapes. One was a computer-controlled 3D biomodelled material called Bonelike. The other was a commercial HA/beta-TCP biphasic material. Both were implanted in patients with medial compartment osteoarthritis. The Bonelike material mimics the mineral composition of natural bone. The control material was prepared using conventional foaming methods. Post-operative monitoring focused on inflammatory reactions and integration. Radiographic and clinical assessments were conducted at 4 months. The International Knee Score (IKS) was used to evaluate functional outcomes.
Main Results:
No inflammatory reactions were observed in either group post-operatively. At 4 months, both materials showed signs of fusion at the osteotomy site. The Bonelike material demonstrated good mechanical resistance. The HA/beta-TCP material also showed acceptable integration. The left knee achieved a valgus correction of 10 degrees. The right knee showed a smaller correction of 6 degrees. The IKS indicated good outcomes in all parameters. Both knees had full range of motion and minimal pain during stairs climbing.
Conclusions:
The study suggests that both materials can integrate without inflammation. The Bonelike material achieved acceptable mechanical resistance. The HA/beta-TCP material also supported structural stability. The valgus correction varied between knees, with 10 and 6 degrees observed. The IKS results suggest functional improvement in both knees. The authors propose that 3D biomodelled materials may offer viable alternatives. The study did not claim superiority of one material over the other. The findings support further evaluation of these materials in larger trials.
Frequently Asked Questions
The material showed good integration and mechanical resistance without inflammation.
Bonelike has a computer-controlled 3D architecture and mimics natural bone composition.
To evaluate functional outcomes like range of motion and pain during stairs climbing.
They were used to monitor fusion and structural stability at the osteotomy site.
The left knee had 10 degrees, while the right knee had 6 degrees.
They propose further evaluation in larger trials to confirm these findings.