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Poly L-lactic acid bioabsorbable screws took longer than 2 years to resorb after ACL reconstruction
Although poly L-lactic acid bioabsorbable interference screws took longer to resorb than previously thought, cyst formation did not occur in all patients and new bone formation was experienced in all patients 16 years after ACL reconstruction, according to results.
Using MRI and a telephone questionnaire at 1 year, 2 years, 4, years, 7 years, 10 years and 16 years postoperatively, researchers assessed 10 consecutive patients who underwent routine ACL reconstruction with a poly L-lactic acid bioabsorbable interference screw (Arthrex) through a standard four-strand hamstring graft technique.
Simon Thompson
Results showed no occurrence of screw resorption or bone formation at 4 years follow-up. However, by 7-year follow-up, researchers found absorption of seven screws; cyst formation in three patients; and new bone formation in five patients. All screws were reabsorbed by 10-year follow-up. Investigators discovered two patients had cyst formation and new bone formation was evident in seven patients.
Researchers noted cyst formation in one patient and evidence of new bone formation in all patients by 16-year follow-up. Results also showed an intact ACL, as well as a return to preinjury sporting activity, among all patients. – by Casey Tingle
Disclosure: The researchers report no relevant financial disclosures.