Clinical Trial on Patient-Specific-Instrumentation Assisted Lapidus Fusion for Hallux Valgus

Not Applicable

Active, not recruiting

• Conditions: Hallux Valgus; Bunion; Patient Spe
• Interventions: Procedure: Conventional Lapidus; Procedure: PSI Lapidus

• Registration Number: NCT05602844
• Lead Sponsor: Chinese University of Hong Kong

Brief Summary

RCT to compare the effectiveness of PSI assisted Lapidus surgery vs conventional Lapidus surgery in hallux valgus.

Detailed Description

Hallux valgus (HV) affects up to 30% of the population. Lapidus surgery, a combination of 1st tarsal-metatarsal joint arthrodesis is one of the most common surgical options for HV. Despite its popularity, the current method alone is not without complications. This will be the world's first Lapidus arthrodesis surgery utilising patient-specific instruments (PSI) as an assistive tool. We hypothesise that PSI will enhance surgical precision, accelerate fusion rates, decrease non-unions, and reduce the need to use bone grafts.

Methods and analysis:

This is a single-blinded, parallel-group, randomised controlled trial comparing the outcome of the 3D-Printed PSI Assisted Lapidus Fusion (n=27) vs Conventional Lapidus Fusion (n=27) for HV deformity. Both groups will receive indentical post-operative rehabilitation of protected weight bearing and splinting. Outcomes measured will include foot function scores, radiological alignment and arthrodesis site assessment with X-ray and High-Resolution Peripheral Quantitative-Computed Tomography, and foot pressure analysis.

Study Timeline

• Study First Submitted: 2022-10-28
• Study First Submitted QC: 2022-10-28
• Study First Posted: 2022-11-02
• Study Start: 2023-04-01
• Status Verified: 2023-09
• Last Update Submitted: 2023-09-21
• Last Update Posted: 2023-09-25
• Primary Completion: 2025-12-31
• Study Completion: 2025-12-31

Recruitment & Eligibility

• Status: ACTIVE_NOT_RECRUITING
• Sex: All
• Target Recruitment: 54

Inclusion Criteria

• Symptomatic Hallux Valgus
• hallux valgus angle >20
• 1,2 Inter-metatarsal angle >9

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Exclusion Criteria

Individuals with (1) disabilities (both physical and mental) which may impair the adherence of the rehabilitation, (2) revision HV surgery, (3) concomitantly undergone additional procedures on the same foot (e.g. claw toe surgery), (4) the use of medications that may influence bone turnover (e.g. chemotherapy, osteoporotic medications) in recent 3 months, (5) medical comorbidity leading to contraindication for surgery, (6) the inability to understand written Chinese/English, (7) who are mentally/physically unable to consent will be excluded.

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Conventional Lapidus	Conventional Lapidus	Lapidus Surgery: exposure of the 1TMTJ via a 3-5cm medial longitudinal skin incision and capsulotomy. Freehand creation of the fusion surface with fluoroscopic assistance. Fixation of the Lapidus arthrodesis will be performed with two 3.5mm headless compression screws.
PSI Lapidus	PSI Lapidus	Design of PSI, 3D printing of PSI, PSI-assisted Lapidus Surgery.

Primary Outcome Measures

Name	Time	Method
Foot Function	52 week	The Foot and Ankle Outcome Score (FAOS) is a reliable and validated patient-reported questionnaire widely used in clinical settings. It consists of five subscales: pain, symptoms, activities of daily living, ability to perform sports and recreational activities, and quality of life. The score of each part is re-coded into a 0-100 scale, with 100 representing no symptoms. (16) The FAOS is a commonly used outcome assessment tool in hallux valgus trials and is reliable and valid by many researchers.
High-resolution peripheral quantitive-Computed Tomography	6 week	HR pQCT allows us to visualize the bony micro-architecture at the Lapidus fusion site and is a more accurate assessment of bone growth compared to X-rays. A rectangular region of interest (ROI) will be established at the fusion surface, inner callus, and external callus area. The volumetric changes in bone mineral density (BMD) in each region will be analyzed.
Time to Radiological Fusion	52 week	Dorsal-plantar and lateral X-rays of the foot will be taken to look for evidence of trabeculations crossing the fusion site. A successful union will be declared if trabeculation extends more than one-half the length of the fusion site.

Secondary Outcome Measures

Name	Time	Method
Non-union rate	26 week	Non-union was defined as greater than 50% lucency on either the AP and lateral radiographs or broken hardware at the fusion site at 26 weeks post-surgery. If lucency, sclerosis, or lack of trabeculation extended more than one-half the length of the fusion site on either the dorsal-plantar or lateral radiograph, a radiographic non-union was declared
Plantar pressure distribution	52 week	The Tekscan Matscan (Tekscan Inc., Boston MA) system will be used to measure the plantar pressure at different anatomical regions during the gait cycle
Deformity severity	52 week	Radiology can provide an objective outcome measurement, the 1,2 intermetatarsal angle (IMA) and hallux valgus angle (HVA) will be measured using dorsal-planar weight-bearing X-rays of the foot. The IMA is defined by drawing an angle from lines bisecting the 1st metatarsal and 2nd metatarsal shaft. A normal IMA is \<9°, while the more severe the deformity, the larger the angle. The HVA is defined by drawing an angle from the bisecting lines of the 1st proximal phalanx shaft and the 1st metatarsal shaft. A normal HVA is \<20° with a larger angle signifying a more severe deformity.
Delayed union rate	12 week	Delayed union was defined as greater than 50% lucency on either the AP and lateral radiographs or broken hardware at the fusion site 12 weeks post-surgery. If lucency, sclerosis, or lack of trabeculation extended more than one-half the length of the fusion site on either the dorsal-plantar or lateral radiograph, a radiographic delayed-union was declared

Trial Locations

Locations (1)

CUHK; 🇭🇰 Hong Kong, Hong Kong