The Corrective Power of Subtalar Arthrodesis With Mini/Medial Bone Block (SAMBB) in Patients Affected by Progressive Collapsing Foot Deformity (PCFD): Analysis Using Weight-bearing Cone Beam CT.

NCT07515170 · tracked via the Priya Life Science Italy tracker

Sponsor

Istituto Ortopedico Rizzoli

Phase

Not applicable

Started

2026-11

Last updated

2026-10-09

Condition(s) studied

Flat Foot

Investigational drug(s) / intervention(s)

Weight-Bearing CT scan

Weight-Bearing CT scan: Weight-Bearing CT scan after surgery

Study summary

Progressive Collapsing Foot Deformity (PCFD) is a complex, multiplanar condition characterized by hindfoot valgus, peritalar subluxation, midfoot abduction, and collapse of the medial arch, which may progress to rigid deformity with pain and functional impairment. In advanced stages, subtalar arthrodesis is a well-established surgical option to restore hindfoot alignment and stability.

Subtalar Arthrodesis with Mini/Medial Bone Block (SAMBB) is an evolution of the Grice-Green technique, using an autologous bone graft to achieve stable correction of talocalcaneal alignment and improve joint congruency, with favorable clinical and radiographic outcomes.

This study aims to evaluate the three-dimensional corrective effect of SAMBB using weight-bearing CT (WBCT), focusing on hindfoot alignment and talocalcaneal and talonavicular relationships.

Eligibility

Sex

ALL

Min age

18 Years

Max age

80 Years

Healthy volunteers

Inclusion Criteria: * Patients of both sexes, aged between 18 and 80 years * Patients affected by grade A2 Progressive Collapsing Foot Deformity (PCFD) * Patients who have provided informed consent to participate in the study Exclusion Criteria: * Patients who have previously undergone corrective surgery on the deformity under study. * Patients with prior lower limb fractures resulting in altered biomechanics. * Patients affected by PCFD of grade A1, B2, C2, E1, or E2 according to the PCFD classification \[2\]. * Patients with active acute or chronic infections. * Patients with chronic inflammatory joint diseases. * Patients with significant lower limb trauma occurring after the surgical intervention. * Patients with pre-existing gait abnormalities (e.g., amputations, neuromuscular diseases, poliomyelitis, hip dysplasia). * Patients with cognitive deficits. * Patients with concomitant neurological disorders. * Patients affected by cancer. * Pregnant patients.

Primary outcome measure(s)

Foot and Ankle Offset — At baseline; After 6 months post op
A three-dimensional parameter derived from weight-bearing CT (WBCT) acquisitions that allows objective quantification of the global alignment of the foot-ankle unit. It measures the spatial relationship between the functional tripod of the foot (first metatarsal, fifth metatarsal, and calcaneus) and the geometric center of the tibiotalar joint, effectively representing a synthetic index of the morpho-functional balance of the hindfoot-midfoot complex.

Trial sites (1)

Facility	City	Region	Status
Istituto Ortopedico Rizzoli	Bologna	Italy

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Official registry record

This page summarises publicly available registry data for informational purposes — not medical advice. Eligibility is determined by each study team; patients should discuss participation with their clinician.

View NCT07515170 on ClinicalTrials.gov ↗ ← All trials in Italy