Delayed foreign-body reaction to absorbable implants in metacarpal fracture treatment.

BACKGROUND

First-generation bioabsorbable implants have been associated with a high complication rate attributable to weak mechanical properties and rapid degradation. This has led to the development of stronger devices with improved durability. However, the modern implants have raised concerns about potential late-occurring adverse reactions.

QUESTIONS/PURPOSES: This retrospective study addressed the following questions: Can absorbable implants consisting of trimethylene carbonate, L-lactide, and D,L-lactide provide adequate fixation for healing of a metacarpal fracture? Will these implants obviate a second removal operation? What complications can occur in the reaction to implant breakdown?

PATIENTS AND

METHODS

Twelve unstable, displaced, metacarpal fractures were studied in 10 consecutive patients (seven men, three women; mean age, 36.4 years; range, 18-75 years). The fractures were treated with absorbable plates and screws consisting of the aforementioned copolymers and designed to resorb in 2 to 4 years. Nine patients (10 fractures) were available for clinical and radiographic followups (mean, 45.7 months; range, 34-61 months).

RESULTS

Fracture healing was uneventful in all cases. Four patients experienced a foreign-body reaction during the second postoperative year and required surgical débridement to remove implant remnants. Histologic examination confirmed the diagnosis of a foreign-body reaction. Two other patients reported a transient local swelling that subsided without treatment.

CONCLUSIONS

Our results indicate these absorbable implants for metacarpal fractures achieved adequate bone healing but simply postponed the problem of foreign-body reactions. Patients treated with bioabsorbable implants should be advised of potential late complications and should be followed for at least 2 years, possibly longer.