Glenn Boehnlein
Vice President, Chief Financial Officer at Stryker
Thanks, Jason. Today, I will focus my comments on our second quarter financial results and the related drivers. Our detailed financial results have been provided in today's press release.
Our organic sales growth was 9% in the second quarter compared to 11.9% in the same quarter of 2023. Average selling days are in-line with 2023. We had a 1.1% favorable impact from pricing. We continue to see positive trends in our pricing initiatives, particularly in our MedSurg and Neurotech businesses, all of which contributed positive pricing for the quarter. Foreign currency had a 0.9% unfavorable impact on sales. In the US, organic sales growth was 9%. International organic sales growth was 8.9%, driven by positive sales momentum across most of our international markets. Our adjusted EPS of $2.81 in the quarter was up 10.6% from 2023, driven by higher sales and partially offset by foreign currency exchange translation, which had an unfavorable impact of $0.03.
Now I will provide some highlights around our quarterly segment performance. In the quarter, MedSurg and Neurotechnology had constant currency sales growth of 9.8% and organic sales growth of 9.7%, which included 10.1% of US organic growth and 8.2% of international organic growth. Instruments had US organic sales growth of 11.9%, led by strong double digit growth in the Surgical technologies business. From a product perspective, sales growth was led by power tools, waste management, smoke evacuation, and Steri-Shield.
Endoscopy had US organic sales growth of 8% with strong growth in its core endoscopy business and its sports medicine business. This growth was led by the continued success of the 1788 Platform and sports medicine shoulder and knee products. This was somewhat offset by slower communications sales due to the timing of installations, which will recover in the second half of this year. Medical had US organic sales growth of 11.9%, driven by strong sales performances in its Emergency Care and Sage businesses, with growth in transport, capital, defibrillators and Sage products.
Neurovascular had US organic sales growth of 2.3%, which reflects some US supply disruption related to flow diversion products. And finally, neurocranial had US organic sales growth of 10.6%, led by double-digit growth in our bone mill, bipolar forceps and cranial, maxillofacial products. Internationally, MedSurg and Neurotechnology had organic sales growth of 8.2%, led by double-digit organic growth in our instruments, neurovascular and neurocranial businesses. Geographically, this included strong performances in China, Australia and Japan.
Orthopaedics and Spine had constant currency sales growth of 8.9% and organic sales growth of 8%, which included organic growth of 7.3% in the US and 9.8% internationally. Our US knee business grew 6.6% organically, reflecting our market leading position in robotic-assisted knee procedures and the continued strength of our installed Mako base. Our US hip business grew 4.3% organically, fueled by our Insignia Hip Stem.
Our US trauma and extremities business grew 9.1% organically with strong performances across our upper extremities, biologics and core trauma businesses. Our US spine business grew 4.4% organically, led by the performance in our interventional spine business. Our US Other ortho business grew 15.4% organically, particularly driven by robust continued momentum of Mako installations. Internationally, Orthopaedics and Spine grew 9.8% organically, including strong performances in Canada, Europe and most emerging markets.
Now, I will focus on operating highlights in the second quarter. Our adjusted gross margin of 64.2% represents approximately 30 basis points of favorability against the second quarter of 2023 and 60 basis-points sequentially as compared to the first quarter of this year. This favorability primarily reflects positive pricing trends and improved material costs and manufacturing efficiencies. Adjusted R&D spending was 6.5% of sales, which was approximately 10 basis-points higher than the second quarter of 2023. Our adjusted SG&A was 33.1% of sales, which was consistent with the second quarter of 2023. In summary, for the quarter, our adjusted operating margin was 24.6% of sales, which was approximately 30 basis points favorable to the second quarter of 2023.
Net adjusted other income and expense of $54 million for the quarter was $12 million lower than 2023, driven by favorable interest income in our invested cash balances. The second quarter of 2024 had an adjusted effective tax rate of 15.2%, reflecting the impact of geographic mix and certain discrete 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 second-quarter with approximately $2 billion of cash and marketable securities and total debt of approximately $12.2 billion. During the quarter, we repaid $600 million of debt that came due in May.
Turning to cash flow, our year-to-date cash from operations is $837 million, reflecting the results of net earnings somewhat offset by working capital changes. Based on our year-to-date performance and our positive outlook related to sustained procedural volumes and a healthy demand for our capital products, we now expect full-year 2024 organic sales growth to be in the range of 9% to 10% with favorable pricing impacting of approximately 0.5%. If foreign exchange rates hold near current levels, we anticipate a moderately unfavorable impact on the full-year sales and now expect EPS will be negatively impacted in the range of $0.10 to $0.15. This is reflected in our guidance. Given our sales momentum, we now expect adjusted net earnings per diluted share to be in the range of $11.90 to $12.10 per share.
And now we'll open the call up for questions.