Guided growth: angular deformity correction through temporary hemiepiphysiodesis with a novel flexible staple...

Area of Science:

• Orthopedic surgery
• Pediatric orthopedics
• Biomedical engineering

Background:

• Temporary hemiepiphysiodesis (HED) is a surgical technique used to correct angular deformities (ADs) in pediatric long bones.
• Traditional implants like Blount staples and two-hole plates are commonly used but associated with implant-associated complications.
• A novel flexible staple has been developed to potentially overcome the limitations of existing implants.

Purpose of the Study:

• To evaluate the initial clinical outcomes of a new flexible staple for guided growth in pediatric angular deformities.
• To compare the efficacy and safety of the flexible staple against traditional Blount staples and two-hole plates.
• To assess the correction speed and complication rates associated with the flexible staple.

Main Methods:

• A prospective study (IDEAL Stage 2a) evaluating 285 flexible staples in 138 patients (22 children, 116 adolescents) with genu valgum or varum.
• Comparison group included 205 two-hole plates in 98 patients and 535 Blount staples in 92 patients.
• Radiographic analysis of mechanical axis deviation (MAD) before and during treatment, with a minimum 24-month follow-up.

Main Results:

• 79% of patients treated with flexible staples achieved sufficient deformity correction.
• Flexible staples demonstrated faster correction of valgus deformities compared to traditional implants.
• Lower rates of implant-associated complications and reduced implantation times were observed with flexible staples.

Conclusions:

• The flexible staple is a viable alternative for guided growth, offering comparable or superior correction speed.
• The new implant shows potential for reducing implant-associated complications in pediatric angular deformity correction.
• Further comparative studies are warranted to confirm the long-term benefits of flexible staples.