Orthopaedic and Neurosurgery Specialists PC

What Orthopaedic and Neurosurgery Specialists PC does

Orthopaedic and Neurosurgery Specialists PC (ONS) is a private subspecialty orthopedic and neurosurgery medical practice founded in 1998, operating five clinical locations across Fairfield County, CT and Westchester County, NY (Greenwich, Stamford, Wilton, Danbury, and Harrison). The practice employs 31 fellowship-trained physicians covering ten subspecialties — hip and knee replacement, shoulder, sports medicine, neurosurgery, spine, hand and upper extremity, foot and ankle, physiatry, primary care sports medicine, and rheumatology — and is owned and operated by ONS MSO, LLC, which does business as Spire Orthopedic Partners.

ONS operates a wholly-owned ambulatory surgical center, the Stamford ASC, which is equipped with robotic-assisted surgical platforms including Smith+Nephew's CORI Surgical System and Zimmer Biomet's ROSA-OptimiZe for total and partial knee replacement. Diagnostic and treatment infrastructure includes on-site MRI, X-ray, nerve conduction studies/EMG, ultrasound-guided injections, orthobiologics (including PRP), shockwave therapy, and physical and occupational therapy, enabling fully integrated care from diagnosis through rehabilitation in the outpatient setting. An opioid-sparing multimodal pain management protocol and anterior-approach hip replacement techniques support same-day discharge for joint replacement.

Revenue is generated through professional service fees reimbursed primarily by major insurance plans (Aetna, Anthem Blue Cross Blue Shield, Cigna, ConnectiCare, United Healthcare, Oxford, Harvard Pilgrim, Medicare, Medicaid) plus workers' compensation and personal injury case revenue. Patients access care via direct-to-consumer channels (website, phone, online scheduling, and walk-in after-hours urgent ortho care), physician referrals, urgent care and emergency department referrals, and community partnerships including team physician roles for athletic programs. Castle Connolly has named ONS a Top 5 Orthopedic Center of Excellence in the nation and recognized 31 ONS physicians on its Top Doctors and Rising Stars lists in both 2025 and 2026.

Name

Orthopaedic and Neurosurgery Specialists PC

Legal name

ONS MSO, LLC d/b/a Spire Orthopedic Partners

Website

https://onsmd.com

Company type

Private

Founded year

1998

Operating status

Operating

Headcount range

101–250 employees

Short description

Orthopaedic and Neurosurgery Specialists PC (ONS) is a private, fellowship-trained orthopedic and neurosurgery practice with 31 physicians operating five clinic locations and a wholly-owned ambulatory surgical center across Fairfield County, CT and Westchester County, NY, serving patients through subspecialty musculoskeletal care, robotic-assisted joint replacement, and integrated diagnostics.

Ownership category

akta.pro rank

Product category

Orthopedic and Neurosurgery Specialty Practice

NAICS

Offices of Physicians (6211), Offices of Physicians (62111), Offices of Physical, Occupational and Speech Therapists, and Audiologists (621340), Diagnostic Imaging Centers (621512)

SIC

Services-Offices & Clinics Of Doctors Of Medicine (8011), Services-Specialty Outpatient Facilities, Nec (8093)

akta.pro primary industry

General Orthopedics (HLAKALAA)

akta.pro secondary industries

Spine (Orthopedic Spine) (HLAKALAE), Shoulder & Elbow (HLAKALAI), Orthopedic & Spine Surgery Centers (HLAFAIAG), Orthopedic Physical Therapy & Post-Op Rehab (HSADAIAA), Pain Management (Spine & Musculoskeletal) (HLAKALAM)

Keywords

• Orthopedic surgery services
• Neurosurgery and spine care
• Sports medicine practice
• Joint replacement surgery
• Musculoskeletal diagnostic imaging

Headquarters

HQ city

Greenwich

HQ country

United States

HQ region

North America

Offices5 records

Markets served

GTM type

B2C

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Medical Consultation and Treatment Services: ONS generates revenue through fees charged for medical consultations, diagnostic procedures, and treatments provided by its fellowship-trained orthopedic and neurosurgical physicians. Services include office visits, surgical procedures, physical and occupational therapy, imaging services, and injections.
2. Insurance-Based Reimbursement: ONS accepts most major insurance plans including Aetna, Anthem Blue Cross Blue Shield, Cigna, ConnectiCare, United Healthcare, Oxford, Harvard Pilgrim, Medicare, Medicaid, and others. Revenue is substantially derived from insurance reimbursements for covered medical services.
3. Workers' Compensation and Personal Injury: ONS provides specialized care for workers' compensation and personal injury cases, generating revenue through negotiated rates with workers' compensation insurers and personal injury settlements. The practice maintains Connecticut and New York State Workers' Compensation certifications.
4. Outpatient Surgical Procedures: Revenue from outpatient surgical procedures performed at the Stamford Ambulatory Surgical Center, including hip and knee replacement, hand surgery, spine procedures, and other orthopedic surgeries in an ambulatory setting.

Go-to-market motion2 records

Distribution channels5 records

Marketing channels7 records

Core offering

ONS is a private orthopedic and neurosurgery practice providing fellowship-trained subspecialty musculoskeletal care across ten specialties — hip and knee replacement, shoulder, sports medicine, neurosurgery, spine, hand and upper extremity, foot and ankle, physiatry, primary care sports medicine, and rheumatology — delivered through five clinic locations and the Stamford Ambulatory Surgical Center (ASC). Core services include robotic-assisted joint replacement (ROSA-OptimiZe, CORI Surgical System), on-site MRI/X-ray/EMG diagnostic imaging, physical and occupational therapy, ultrasound-guided injections, orthobiologics, and outpatient joint replacement with opioid-sparing protocols.

Product overview

ONS is a comprehensive orthopedic and neurosurgery practice offering subspecialty musculoskeletal care across 10+ specialties. The practice operates multiple locations (Greenwich, Stamford, Wilton, Harrison, Danbury) and features an in-house ambulatory surgical center (Stamford ASC) with advanced robotic surgical systems. Services include surgical specialties (hip/knee replacement, sports medicine, spine, hand/upper extremity, foot/ankle, neurosurgery), diagnostic imaging (MRI, X-ray, EMG), interventional treatments (ultrasound-guided injections, orthobiologics, shockwave therapy), and rehabilitation services. The practice is distinguished by its investment in robotic-assisted surgery technology (CORI Surgical System, Rosa-OptimiZe) and recognition as a Top 5 Orthopedic Center of Excellence by Castle Connolly.

Differentiator

Problem solved

Functional benefit

Products and services

• Hip and Knee Replacement Fellowship-trained orthopedic surgeons perform robotic-assisted, anterior-approach, and outpatient hip and knee replacement procedures for patients with joint degeneration and arthritis.
• Shoulder Care Comprehensive shoulder care including rotator cuff repair, shoulder replacement, and sports medicine procedures.
• Sports Medicine Treatment of sports-related injuries across athletes at all levels — from community players to elite competitors.
• Neurosurgery Neurosurgical services including spine surgery, minimally invasive procedures, and treatment of neurological conditions.
• Spine Care Surgical and non-surgical treatment of back pain, spinal stenosis, disc herniation, and spine deformities.
• Hand and Upper Extremity Hand, wrist, and elbow surgery including microsurgical nerve reconstruction, arthroscopic treatment, and endoscopic carpal tunnel release.
• Foot and Ankle Comprehensive foot and ankle orthopedic care including sports injuries and arthritis treatment.
• Physiatry Physical medicine and rehabilitation focused on interventional spine and musculoskeletal medicine with ultrasound and fluoroscopy-guided treatments.
• Primary Care Sports Medicine Primary care sports medicine for athletes and active individuals.
• Rheumatology Rheumatologic care for arthritis and autoimmune conditions affecting the musculoskeletal system.
• Urgent Ortho Care Walk-in after-hours urgent orthopedic care available at the Wilton and Greenwich locations, Monday to Friday 4:00 pm to 7:00 pm and Saturdays 12:00 to 4:00 pm.
• Physical and Occupational Therapy Rehabilitation services to help patients recover from injuries and surgeries.
• MRI On-site magnetic resonance imaging for diagnostic purposes.
• X-ray On-site X-ray imaging services for diagnosis of orthopedic conditions.
• Nerve Conduction Studies and Electromyography (EMG) Diagnostic testing for nerve and muscle conditions.
• Ultrasound-Guided Injections Image-guided injection treatments for precise delivery of medications to target areas.
• Orthobiologics Regenerative medicine treatments including platelet-rich plasma (PRP) and other biologic therapies.
• Workers' Compensation and Personal Injury Specialized orthopedic and neurosurgical care for work-related injuries covered by CT and NY State Workers' Compensation and personal injury cases.
• Shockwave Therapy Non-invasive high-energy sound wave treatment promoting healing and pain reduction for plantar fasciitis, Achilles tendinopathy, tennis elbow, and rotator cuff tendinopathy.
• Outpatient Joint Replacement Program Rapid-recovery surgical program enabling same-day-discharge hip and knee replacement via anterior muscle-sparing approach, computer-assisted surgery, and multimodal opioid-minimizing pain management.
• Stamford Ambulatory Surgical Center (Stamford ASC) State-of-the-art outpatient ambulatory surgery center exclusively for ONS patients, equipped with CORI and ROSA-OptimiZe robotic systems for joint replacement, spine, hand, and other orthopedic procedures. Named among U.S. News & World Report's Best Ambulatory Surgery Centers in Connecticut.
• Rosa-OptimiZe Robotic Total Knee Replacement Robotic-assisted total knee replacement utilizing infrared cameras and bone trackers for sub-millimeter precision 3D knee anatomy capture and accurate bone cuts and implant placement, without requiring pre-operative CT scans. First in Connecticut.
• CORI Surgical System Knee Replacement Robotic-assisted knee replacement using the Smith+Nephew CORI Surgical System — a handheld surgeon-controlled portable design with image-free smart mapping and 3D modeling that supports total and partial knee replacement via minimally invasive approach.

Quantifiable outcome

• 31 ONS physicians recognized on Castle Connolly Top Doctors list (2025 and 2026)
• +4 more outcomes

Named customers8 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Seven partnerships are on record, tiered core and minor.

• ONS MSO, LLC d/b/a Spire Orthopedic PartnerscoreOthersONS is owned and operated by ONS MSO, LLC, which does business as Spire Orthopedic Partners. Spire oversees the website, administrative operations, compliance, and business infrastructure supporting ONS's clinical operations.
• Stamford Ambulatory Surgical Center (ASC)coreStrategic or Co-development PartnerThe Stamford ASC is a specialized ambulatory surgical center exclusively for ONS patients, enabling outpatient joint replacement, spine surgery, hand surgery, and other orthopedic procedures. It provides a state-of-the-art outpatient setting with advanced technology including ROSA-OptimiZe and CORI robotic surgical systems.
• Greenwich HospitalcoreStrategic or Co-development PartnerONS has a formal affiliation with Greenwich Hospital where Dr. Kevin Choo serves as Director of Hip and Knee Replacement. The hospital provides inpatient facilities for ONS surgical procedures requiring overnight stays, complementing the outpatient Stamford ASC.
• Smith+Nephew (CORI Surgical System)coreTechnology or IntegrationONS deployed the Smith+Nephew CORI Surgical System at its Stamford ASC, enabling advanced robotic-assisted knee replacement surgery. Smith+Nephew provides the robotic platform while ONS provides the surgical expertise and patient population.
• Iona Prep Football TeamminorStrategic or Co-development PartnerONS serves as the official team physician for the Iona Prep Football Team, providing sports medicine coverage and injury care for student-athletes. This community partnership supports local athletic programs.
• CRUDEM Foundation (Haiti)minorStrategic or Co-development PartnerONS physicians, including Dr. Jonathan Berliner, participate in medical volunteer missions through the CRUDEM Foundation in Haiti, providing orthopedic surgical care to underserved populations.
• Hospital Lenin Fonseca (Nicaragua)minorStrategic or Co-development PartnerONS physicians volunteer surgical services at Hospital Lenin Fonseca in Nicaragua as part of international medical mission work.

Scale indicators4 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Cleveland Clinic Orthopedic Surgery: Large health system offering comprehensive orthopedic services across multiple specialties and geographies. Comparable to ONS as a broad incumbent in specialty orthopedic delivery, though operating as part of a much larger hospital system rather than an independent specialist practice.
• Hospital for Special Surgery (HSS): The dominant orthopedic specialty hospital in the U.S., headquartered in NYC. Comparable to ONS as a multi-subspecialty orthopedic destination with elite brand authority, fellowship-trained physicians, and aggressive expansion into Westchester and CT suburbs that directly overlaps ONS's home market.
• New England Baptist Hospital: Boston-based specialty hospital focused exclusively on orthopedic and musculoskeletal care. Comparable to ONS as a Northeastern orthopedic-focused specialty provider with subspecialty coverage and ASC-style outpatient capability.
• Columbia Orthopedics (NewYork-Presbyterian): Academic orthopedic group affiliated with Columbia/NewYork-Presbyterian. Comparable to ONS in subspecialty orthopedic depth and brand prestige, though embedded in an academic hospital system with a different payer mix and cost structure.

Direct peers

• Midwest Orthopaedics at Rush: Multi-specialty orthopedic group affiliated with Rush University Medical Center in Chicago. Comparable to ONS as a fellowship-trained subspecialty practice with sports medicine emphasis, ASC affiliations, and academic/research linkages.
• OrthoConnecticut: Multi-specialty orthopedic group headquartered in Connecticut with multiple locations across the state. Directly comparable to ONS as a regional competitor offering similar subspecialty orthopedic care, imaging, and physical therapy within overlapping CT geographies.
• The Steadman Clinic: Elite orthopedic and sports medicine practice in Vail, CO serving professional athletes and community patients. Comparable to ONS in its fellowship-trained specialist model, sports medicine leadership, and Castle Connolly–style brand recognition in musculoskeletal care.
• Rothman Orthopaedic Institute: Large multi-specialty orthopedic group operating across the Mid-Atlantic with in-house ASCs, MRI, and physical therapy. Directly comparable to ONS in offering fellowship-trained subspecialty coverage across 10+ orthopedic disciplines plus an owned ambulatory surgery platform.
• Premier Orthopaedics & Sports Medicine: Multi-location orthopedic specialty group in the Mid-Atlantic with fellowship-trained surgeons, on-site imaging, physical therapy, and ASC affiliations. Comparable to ONS in scale, subspecialty coverage, and integrated outpatient musculoskeletal delivery model.

Regional players

• Yale Orthopaedics & Rehabilitation: Academic orthopedic practice at Yale School of Medicine serving Connecticut patients with subspecialty care. Comparable to ONS as a Connecticut-based multi-subspecialty orthopedic provider with strong brand and tertiary-care capabilities in overlapping CT geography.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/onsmd
• Facebookfacebook.com/ONSMD
• LinkedInlinkedin.com/company/onsmd
• Instagraminstagram.com/onsmd

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Orthopaedic and Neurosurgery Specialists PC