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NCT Number: NCT06262204

Hallux Valgus Correction Using the Metal Screw or the Human Allogeneic Cortical Bone Screw (Shark Screw).

The goal of this clinical trial is to compare the treatment of Hallux Valgus using the conventional method (metal screw) with the new method (human allogeneic cortical bone screw (Shark Screw®) in adult patients with confirmed Hallux Valgus.

The main questions it aims to answer are:

Can the new method obtain comparable results as the conventional method in regard to union rate and time to union? Are the number of complications lower with the new method? Participants will be operated either with the metal screw or with the Shark Screw®. The assignment to the groups is randomized.

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Key information

Conditions

Hallux Valgus Foot Deformities Musculoskeletal Diseases

Age range

18 year–85 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Abteilung für Kinderorthopädie und Fußchirurgie Orthopädisches Spital Speising

Vienna, 1130, Austria

Location contact

Florian Wenzel-Schwarz, MD

CONTACT

[email protected]

+43180182 ext. 3081

Florian Wenzel-Schwarz, MD

PRINCIPAL_INVESTIGATOR

About this study

The planned prospective study will investigate whether the use of the human allogenic cortical bone screw (Shark Screw® leads to comparable results in the union rate and the prevention of recurrences as with metal screws. Furthermore, it will be investigated whether rotational stability is possible with the bone screw. The measurement of the HVA angle and the IMA angle should provide information on whether the correction is stable over time. A comparison of the AOFAS forefoot score before and after the operation for both methods is a further measure to check whether the human allogenic cortical bone screw can deliver similar results.

Initial studies on the use of the allogenic bone screw in hand and foot surgery show particularly good integration behavior of the human allogenic cortical bone screw . A retrospective study by Hanslik-Schnabel et al has shown initial positive results in the treatment of hallux rigidus. In addition, a gait analysis is performed pre- and postoperatively to provide information on possible differences between the two groups in the context of 3D gait analysis/pedobarography and is also matched with another healthy cohort.

At the preoperative time point and after 12 and 24 months, a 3D gait analysis with a foot model is conducted to record the joint kinematics and kinetics. In the study by Canseco et al. , the proximal gait pattern changes remained unchanged. Hwang reported hyper-external rotation in the subtalar joint, excessive eversion in the subtalar joint, and lack of movement in the hallux MP joint in the terminal standing phase.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • between 18 and 85
  • confirmed Hallux Valgus

Exclusion criteria

  • <18 years and >85 years
  • Known underlying oncological disease
  • Pregnant women or breastfeeding mothers
  • Alcohol and drug abuse
  • Foreseeable compliance problems
  • Foreseeable loss of responsibility as a study doctor
  • Neoplastic diseases
  • Active osteomyelitis
  • Ulcerations in the area of the skin of the surgical site
  • Immunosuppressive medication that cannot be discontinued

Treatment and study plan

Hallux Valgus Treatment with Shark Screw®

Procedure

This is a prospective, randomised study in which hallux valgus is corrected by means of a chevron/kin surgery technique using metal screws or human allogenic cortical bone screws (Shark Screw®, Surgebright, Lichtenberg, Austria). X-rays are taken before the operation at 6 weeks, three, six and twelve months after the operation. The X-ray images provide information on whether bony degeneration has taken place. In addition, the American Orthopaedic Foot & Ankle Society (AOFAS) hallux score, FFI score, hallux valgus angle (HVA) and intermetatarsal angle (IMA) are determined. These data are collected preoperatively and 4 weeks (HVA and IMA), six and twelve months postoperatively in order to rule out a change in the HVA and IMA and to document the changes in the AOFAS/FFI.

Hallux Valgus Treatment with metal screw

Procedure

This is a prospective, randomised study in which hallux valgus is corrected by means of a chevron/kin surgery technique using metal screws or human allogenic cortical bone screws (Shark Screw®, Surgebright, Lichtenberg, Austria). X-rays are taken before the operation at 6 weeks, three, six and twelve months after the operation. The X-ray images provide information on whether bony degeneration has taken place. In addition, the American Orthopaedic Foot & Ankle Society (AOFAS) hallux score, FFI score, hallux valgus angle (HVA) and intermetatarsal angle (IMA) are determined. These data are collected preoperatively and 4 weeks (HVA and IMA), six and twelve months postoperatively in order to rule out a change in the HVA and IMA and to document the changes in the AOFAS/FFI.

Primary outcomes

  1. clinical result of Hallux Valgus treatment

    Time frame: 2 years

    The primary objective of the study is the longitudinal evaluation of clinical outcomes (pain, appearance) over 2 years after hallux correction using a human, allogenic, bone screw or metal screw.

Secondary outcomes

  1. radiological (bony union)result of Hallux Valgus treatment

    Time frame: 1 years

    The secondary aim of the study is the longitudinal evaluation of the radiological results over one year after hallux correction using a human, allogenic, bone screw or metal screw compared to pre-surgery values.

  2. change in forefoot-American Orthopaedic Foot and Ankle Society (AOFAS)

    Time frame: 2 years

    The change in forefoot-AOFAS will be evaluated, between groups and in comparison to pre-surgery

  3. Hallux-Valgus angle (HVA) change

    Time frame: 2 years

    Comparison of HVA pre-surgery and after 6, 12 and 24 months after surgery, between groups and in comparison to pre-surgery data

  4. gait analysis

    Time frame: 2 years

    Number of patients with normal gait in the two groups and in comparison to a healthy cohort

  5. Intermetatarsal angle (IMA) change

    Time frame: 2 years

    Comparison of IMA pre-surgery and after 6, 12 and 24 months after surgery, between groups and in comparison to pre-surgery data

Study contacts

Contact information is provided by the study sponsor or research team.

Andreas Kranzl, PhD

CONTACT

[email protected]

Florian Wenzel-Schwarz, MD

CONTACT

[email protected]

+43180182 ext. 3081

Sponsors and collaborators

Lead sponsor

Orthopedic Hospital Vienna Speising

Other

Registry information

Official study title

Clinical and Radiological Comparison of Hallux Valgus Correction Using the Metal Screw or the Human Allogeneic Cortical Bone Screw, a Prospective Study

Important dates

Study start
2026
Primary completion
2028
Study completion
2028
First posted
Feb 15, 2024
Registry last updated
Apr 2, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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