Glenn Boehnlein
Vice President, Chief Financial Officer at Stryker
Thanks, Jason. Today, I will focus my comments on our first quarter financial results and the related drivers. Our detailed financial results have been provided in today's press release.
Our organic sales growth was 13.6% in the quarter. The first quarter of 2023 had one more selling day than 2022, which is approximately a 1% benefit. The impact from pricing in the quarter was favorable by 0.7%. We continue to see a positive trend from our pricing initiatives, particularly in our U.S. MedSurg businesses, all of which contributed positive pricing for the quarter. Foreign currency had a 2.2% unfavorable impact on sales.
In the quarter, U.S. organic sales growth was 12.6%. International organic sales growth was 16.6%, impacted by positive sales momentum across most of our international markets. Our adjusted EPS of $2.14 in the quarter was up 8.6% from 2022, driven by higher sales and a favorable adjusted income tax rate, partially offset by inflationary pressures and the impact of foreign currency exchange, which was unfavorable $0.06.
Now I will provide some highlights around our quarterly segment performance. In the quarter, MedSurg and Neurotechnology had constant currency sales growth of 13.1%, with organic sales growth of 12.4%, which included 12.1% of U.S. organic growth and 13.3% of international organic growth.
Instruments had U.S. organic sales growth of 8.9%, led by double-digit growth in the Surgical Technology business. From a product perspective, sales growth was led by power tools, Steri-Shield, waste management and smoke evacuation. Endoscopy had U.S. organic sales growth of 16.2%, driven by strong growth across most of its major businesses. The growth was highlighted by general surgery, sports medicine, sustainability, communications and ProCare products.
Medical had U.S. organic sales growth of 13.2%, reflecting solid performances across our acute care, emergency care and Sage businesses, and benefiting from improvement in product supply throughout the quarter. Our U.S. Neurovascular business returned to growth with organic sales growth of 7.3%, reflecting a strong performance in our hemorrhagic business. The U.S. neuro-cranial business had organic sales growth of 9.1%, which included double-digit growth in our SONOPET iQ signature high-speed drills, bipolar forceps and max-based neuro product lines.
Internationally, MedSurg and Neurotechnology had organic sales growth of 13.3%, reflecting double-digit growth in almost all businesses. Geographically, this included strong performances in Europe, Australia, Canada and Japan.
Orthopedics and Spine had constant currency sales growth of 15.1%, with organic sales growth of 15.2%, which included organic growth of 13.3% in the U.S. and 20.3% internationally. Our U.S. hip business grew 16.2% organically, reflecting strong primary hip growth fueled by our Insignia Hip Stem and continued procedural growth. Our U.S. Knee business grew 20.7% organically, which reflects our market-leading position in our robotic-assisted knee procedures.
Our U.S. Trauma and Extremities business grew 13.7% organically with strong performance across all three businesses. Our U.S. Spine business grew 6.3%, led by the performance in our enabling technology and Interventional Spine businesses, including the recently launched Q Guidance navigation system. Our U.S. other ortho declined organically by 14.8%, primarily driven by the impact of deal mix changes, specifically more rentals related to Mako installations in the quarter. Internationally, Orthopaedics and Spine grew 20.3% organically, which reflects strong performances in Europe, Australia, Canada and emerging markets.
Now I will focus on operating highlights in the first quarter. Our adjusted gross margin of 63.2% was unfavorable, approximately 90 basis points from the first quarter of 2022, reflecting the impact of increased manufacturing and supply chain costs driven by inflationary pressures, somewhat offset by price and volume increases. Sequentially and compared to Q4 2022, we have improved our adjusted gross margin by approximately 50 basis points driven by mix, price, decreases in spot prices and improved manufacturing efficiencies.
Adjusted R&D spending was 6.5% of sales, which represents a 70 basis point decrease from the first quarter of 2022 due primarily to higher comparable in 2022, which related to the ramping of costs for product launches. Our adjusted SG&A was 35.6% of sales, which was 50 basis points higher than the first quarter of 2022, primarily due to normalization of sales force expansion and meetings. In summary, for the quarter, our adjusted operating margin was 21.1% of sales, which was approximately 70 basis points unfavorable to the first quarter of 2022. This performance is primarily driven by the aforementioned inflationary pressures, primarily on gross margin.
Adjusted other income and expense of $65 million for the quarter was slightly higher than 2022, mainly driven by a one-time benefit in 2022. The first quarter of 2023 had an effective tax rate of 12.8%, reflecting the impact of geographic mix and certain discrete tax items, including stock compensation. For 2023, we now expect full year effective tax rate to be in the range of 14% to 15%.
Focusing on the balance sheet, we ended the first quarter with $1.8 billion of cash and marketable securities and total debt of $13.1 billion. Approximately $100 million of term loan debt was paid down in the quarter. Turning to cash flow. Our year-to-date cash from operations is $445 million. This performance reflects the results of net earnings and higher accounts receivable collections in the first quarter.
Considering our first quarter results, our strong order book for capital equipment and continued positive procedural trends, we now expect full year 2023 organic sales growth to be in the range of 8% to 9%, with pricing to be relatively neutral for the year. If foreign exchange rates hold near current levels, we anticipate that sales and EPS will be modestly unfavorably impacted for the full year, being more negative in the first half of the year. This is included in our guidance.
Based on our performance in the first quarter, together with our strong sales momentum and further progressive easing of supply chain disruptions throughout the year, we now expect adjusted earnings per share in the range of $10.05 to $10.25.
And now I will open up the call for Q&A.