v3.25.4
Cover - USD ($)
 12 Months Ended
Dec. 31, 2025
Mar. 03, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-42771    
Entity Registrant Name Shoulder Innovations, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 27-0538764    
Entity Address, Address Line One 1535 Steele Avenue SW    
Entity Address, Address Line Two Suite B    
Entity Address, City or Town Grand Rapids    
Entity Address, State or Province MI    
Entity Address, Postal Zip Code 49507    
City Area Code 616    
Local Phone Number 294-1026    
Title of 12(b) Security Common Stock, par value $0.001 per share    
Trading Symbol SI    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 0
Entity Common Stock, Shares Outstanding   20,647,526  
Documents Incorporated by Reference
Portions of the registrant’s definitive proxy statement for use in connection with its 2026 Annual Meeting of Stockholders, which is to be filed no later than 120 days after December 31, 2025, are incorporated by reference into Part III of this Annual Report on Form 10-K.
    
Entity Central Index Key 0001699350    
Amendment Flag false    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2025