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 10% in the quarter, compared to 13.6% in the first quarter of 2023. This quarter, we had one less selling day than 2023. 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 MedSurg and Neurotech businesses, almost all of which again contributed positive pricing for the quarter. Foreign currency had a 0.5% unfavorable impact on sales in the quarter. In the quarter, U.S. organic sales growth was 11.3%. International organic sales growth was 6.6%, against a very strong comparable growth of over 16% in 2023. This performance included positive sales momentum across most of our international markets, particularly in the United Kingdom and Canada, and most of our emerging markets. Our adjusted EPS of $2.50 in the quarter was up 16.8% from 2023, driven by strong sales growth and operating margin expansion. Foreign currency exchange translation had an unfavorable impact of $0.05.
Now, I will provide some highlights around our quarterly segment performance. In the quarter, MedSurg in Neurotechnology had constant currency sales growth of 12% and organic sales growth of 11.6%, which included 13.5% of U.S. organic growth and 6% of international organic growth. Instruments had U.S. organic growth of 19%, with strong double-digit growth across the Orthopedic Instruments and Surgical Technologies businesses. From a product perspective, sales growth was led by almost 50% growth in smoke evacuation and strong performances in Power Tools, Steri-Shield, Waste Management, and SurgiCount. Endoscopy had U.S. organic sales growth of 11.1%, with double-digit growth in its communications and endo BU businesses. And from a product perspective, standout growth included cameras, light sources, insufflators, booms, and sports medicine implants.
Medical had U.S. organic sales growth of 16.8%, led by the solid sales performances in all three businesses. This included strong growth in stretchers, cots, Vocera, and Sage products. Neurovascular had U.S. organic sales growth of 2.9%, highlighted by solid performances in our hemorrhagic stents and guidewires. Neurocranial had U.S. organic sales growth of 7%, driven by strong performance in our CMF business. Internationally, MedSurg and Neurotechnology had organic sales growth of 6%, which included strong performances in our emerging markets. Orthopedics and spine had both constant currency and organic sales growth of 8%, which included organic growth of 8.3% in the U.S. and 7.4% internationally. Our U.S. Hip business grew 6.8% organically against a very strong comparable of 16.2% in the same quarter last year. This growth reflects continued strong primary hip performance fueled by our Insignia Hip Stem. Our U.S. Knee business grew 3.1% organically against another very strong comparable of 20.7% in the first quarter of 2023. Our knee growth reflects our market leading position in robotic-assisted knee procedures and the continued strength of our installed base. Our U.S. Trauma and Extremities business grew 10.3% organic, with strong performances across our upper extremities, biologics, and core trauma businesses. Our U.S. Spine business grew 3.9% organically, led by the performance in our Interventional Spine business. Our U.S. Other Ortho business grew 45.6% organically, driven by strong Mako installations in the quarter. Internationally, Orthopedics and Spine grew 7.4% organically, including strong performances in Canada and most emerging markets, particularly driven by strong Mako installations.
Now I will focus on operating highlights in the first quarter. Our adjusted gross margin of 63.6% represents approximately 50 basis points favorability against the first quarter of 2023. This improvement reflects positive pricing trends as well as continued easing of certain cost pressures that we experienced in the first quarter of 2023. Adjusted R&D spending was 6.8% of sales, which was 30 basis points higher than the first quarter of 2023. Our adjusted SG&A was 35% of sales, which was 60 basis points lower than the first quarter of 2023, due to continued discipline in our spending and investments to support our growth.
In summary, for the quarter, our adjusted operating margin was 21.9% of sales, which was approximately 80 basis points favorable to the first quarter of 2023. Adjusted other income and expense of $49 million for the quarter was $16 million lower than 2023, driven by favorability in interest rates and a higher level of invested cash, resulting in higher interest income. The first quarter of 2024 had an adjusted effective tax rate of 12.3%, reflecting the impact of our geographic mix and certain discrete tax items. For 2024, we still expect our 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 $2.4 billion of cash and marketable securities and total debt of approximately $13 billion. Our total debt includes $600 million of debt that is due to be repaid in May and has been pre-funded.
Turning to cash flow, our year-to-date cash from operations is $204 million, reflecting the results of net earnings and normal first quarter seasonal cash outflows. Considering our first quarter results, strong procedural volumes, and healthy demand for our capital products, we now expect our full year 2024 organic sales growth to be in the range of 8.5% to 9.5%, with the pricing impact to be roughly flat. If foreign exchange rates hold near current levels, we anticipate sales will be moderately unfavorable, impacted for the full year, being more negative in the first half of the year. EPS will be negatively impacted at the higher end of our previously guided range of $0.05 to $0.10. With our momentum heading into the rest of the year and our commitment to expanding operating margins, we now expect adjusted net earnings per diluted share to be in the range of $11.85 to $12.05.
And now I will open up the call for Q&A.