Net Sales
MIMEDX reported net sales for the three months ended December 31, 2022, of $74.4 million, compared to $67.4 million for the three months ended December 31, 2021, an increase of 10.3%. Net sales growth came from solid contributions in both the Wound & Surgical end markets.
For the full year 2022, MIMEDX reported net sales of $267.8 million, compared to $258.6 million in the prior year period, reflecting growth of 3.6%. MIMEDX’s full year 2022 net sales also reflect growth of 10.5% across its continuing portfolio of Advanced Wound Care products.
Gross Profit and Margin
Gross profit for the three months ended December 31, 2022, was $60.0 million, an increase of $3.4 million as compared to the prior year. For the full year 2022, gross profit was $219.5 million, reflecting an increase of $4.2 million compared to the prior year period.
Gross margin for the three months ended December 31, 2022, was 80.7%, compared to 84.0% for the three months ended December 31, 2021. For the full year 2022, MIMEDX reported gross margin of 82.0%, compared to 83.3% for the full year 2021.
Gross margins were negatively influenced in both the fourth quarter and for the full year 2022 by impacts from production variances, primarily due to lower production levels.
Operating Expenses
Selling, general and administrative (“SG&A”) expenses for the three months ended December 31, 2022 were $50.0 million compared to $53.1 million for the three months ended December 31, 2021. SG&A expense during the fourth quarter 2022 included increased sales commissions and the impact of severance associated with restructuring activities. Lower compensation expense, principally due to year-end incentive adjustments, more than offset the impact of the increased costs.
For the full year 2022, SG&A expenses totaled $208.8 million, compared to $198.4 million for the prior year period. The increase was driven by higher travel expenses, sales commissions, bad debt expense and severance costs, all of which were partially offset by the reversal of share-based compensation expense associated with the severance activities and lower professional service expenses.
Research and development expenses were $5.4 million for the three months ended December 31, 2022 compared to $4.6 million for the three months ended December 31, 2021. The increase was primarily driven by higher costs associated with our KOA clinical program. For the full year 2022, research and