| Abbreviation | Definition |
|---|---|
| OPLL | Ossification of the Posterior Longitudinal Ligament |
| OPLL | Ossification Posterior Longitudinal Ligament |
| OPTA | Orthopaedic Physical Therapy Associates |
| OPTP | Orthopaedic Physical Therapy Practice |
| OREF | Orthopaedic Research and Education Foundation |
| ORTHOP | Orthopaedics |
| OS | Orthopaedic Surgeon |
| OSAE | Orthopaedic Self Assessment Examination |
| OSC | Orthopaedic and Spine Center |
| OSCC | Orthopaedic Surgery Center of Clearwater |
| OSG | Orthopaedic Specialty Group |
| OSI | Orthopaedic Specialty Institute |
| OSMA | Orthopaedic Surgical Manufacturers Association |
| OSRA | Orthopaedic Surgery and Rehabilitation Associates |
| OTHA | Orthopaedic Trauma Hospital Association |
| OTPS | Orthopaedic Trauma Plating System |
| OTRC | Orthopaedic Trauma Research Consortium |
| OVT | Orthopaedic Video Theater |
| PIOA | Pacific Islands Orthopaedic Association |
| POA | Piedmont Orthopaedic Associates |