The Use of a Human Acellular Dermal Matrix (hADM) Transplant in Stage 4 Osteochondrosis Dissecans: A Retrospective Proof of Concept.

Background

Osteochondral lesions (OD) of the talus represent a significant clinical challenge, particularly in advanced-stage cases requiring osteotomy access and cancellous bone grafting. Human acellular dermal matrix (hADM) has demonstrated promising biological properties-including biocompatibility, preserved extracellular matrix architecture, and neovascularization capacity-in reconstructive bone and soft tissue surgery. To our knowledge, its use as a defect-sealing membrane in osteochondral surgery of the talus has not previously been reported clinically.

Methods

This retrospective case series evaluated six patients with stage 4 talar OD treated surgically using hADM as a defect-closing membrane in combination with malleolar osteotomy and autologous cancellous bone grafting. Clinical outcomes were assessed using the Foot and Ankle Disability Index (FADI) and FADI Sport score at a mean follow-up of 13 months (range 10-14 months). Predefined safety endpoints comprised local inflammatory reaction, material-related adverse events, wound-healing disturbance, union of the malleolar osteotomy, iliac crest donor-site morbidity and revision surgery.

Results

Functional improvement was observed in all six patients. The mean FADI score rose from 31.2 (±7.8) to 96.5 (±14.1) points and the mean FADI Sport score from 4.0 (±5.2) to 27.8 (±9.2) points, corresponding to absolute gains of 65.3 and 23.8 points, respectively. Five of six patients (83.3%) reported complete resolution of symptoms. No revision of the cartilage reconstruction was required, and none of the predefined adverse events occurred.

Conclusions

In this uncontrolled six-patient series, sealing the reconstructed defect with hADM was technically feasible and none of the predefined adverse events were observed within the reported follow-up. Because all patients additionally underwent debridement, malleolar osteotomy and autologous cancellous bone grafting, the functional gains cannot be attributed to the membrane itself. These preliminary observations are hypothesis-generating and support further prospective, controlled investigation of hADM as a defect-sealing material in osteochondral surgery.