Osteotomy is a surgical procedure involving the deliberate cutting and reshaping of a bone to alter its length, alignment, or structural geometry. It is distinguished from osteoclasis (the intentional or accidental breaking/fracturing of a bone without a surgical incision) and ostectomy (the excision or removal of a segment of bone) because the cut bone in an osteotomy is typically realigned and retained, often stabilized with internal or external hardware. The underlying mechanism involves creating a controlled, precise fracture through the cortical and cancellous bone to redirect mechanical load-bearing axes, offload damaged articular cartilage, or correct congenital or post-traumatic deformities. It is an elective reconstructive or corrective intervention (e.g., high tibial osteotomy to delay knee replacement in medial compartment osteoarthritis) rather than a pathological disease state. Clinically relevant subtypes include closing wedge, opening wedge, dome, and rotational osteotomies, which are coded under various musculoskeletal CPT codes depending on the specific bone and segment. It is commonly confused with arthroplasty (joint replacement); the key difference is that an osteotomy preserves the native joint by realigning the adjacent bone, whereas arthroplasty removes and replaces the articular surfaces.
“a cutting,” “incision” — noun-forming suffix denoting the surgical act of cutting into or through a structure
The word entered English in the 1820s as osteotomy (noun), borrowed from modern Latin osteotomia, from Greek osteon (bone) + tomia (a cutting) — literally “a cutting of bone.” The adjective form osteotomic and the back-formed verb osteotomize appeared later in the 19th century as the surgical technique became standardized. The root osteon (“bone”) connects osteotomy to the entire -osteo- FAMILY: osteopathy (osteo- + -pathy → bone disease), osteogenesis (osteo- + -genesis → bone formation), and osteoblast (bone-forming cell). The suffix -tomy is highly productive in surgical terminology, appearing in arthrotomy (cutting into a joint), craniotomy (cutting into the skull), and laminotomy (cutting a vertebral lamina).
🔀 ALIASES / ALTERNATE TERMS
Osteotomic(adjective form — e.g., “osteotomic site,” “osteotomic healing,” “osteotomic gap”)
Osteotomize(verb form — e.g., “to osteotomize the proximal tibia,” “the surgeon osteotomized the femur”)
Bone sectioning(lay and clinical term; used broadly across orthopedic and maxillofacial specialties)
Corrective bone surgery(lay term emphasizing the functional goal of the procedure rather than the mechanical action)
High Tibial Osteotomy (HTO)(specific anatomic subtype; realigns the tibia to shift weight away from damaged medial knee cartilage; coded under CPT 27705)
Salter innominate osteotomy(pediatric pelvic subtype; redirects the acetabulum to cover the femoral head in developmental dysplasia of the hip)
Le Fort osteotomy(maxillofacial subtype; involves cutting the maxilla to correct facial skeletal deformities or malocclusion)
Metatarsal osteotomy(podiatric/foot subtype; used to correct hallux valgus/bunions or metatarsalgia; CPT 28306-28309)
Opening wedge osteotomy(technique subtype; a wedge of bone is removed on one side to open a gap, often requiring bone graft)
Closing wedge osteotomy(technique subtype; a wedge of bone is removed and the cut ends are compressed together without grafting)
Periarticular osteotomy(anatomic subtype performed near a joint surface to alter joint mechanics without entering the joint capsule itself)
🔗 RELATED TERMS
Ostectomy — the excision or removal of a portion of bone (e.g., removing a bony prominence, osteophyte, or tumor); unlike osteotomy, the removed bone is not retained or realigned to correct a structural axis.
Osteoclasis — the intentional breaking or refracturing of a bone to correct a deformity, typically performed manually or with a specialized instrument without making an open surgical incision through the bone.
Osteosynthesis — the internal fixation of bone fragments following an osteotomy or fracture using hardware (plates, screws, intramedullary rods); this is the stabilizing step that follows the osteotomy cut.
Arthroplasty — surgical reconstruction or total replacement of a joint; often the definitive next step if a joint-preserving osteotomy fails or is no longer indicated due to advanced, bone-on-bone joint degeneration.
Epiphysiodesis — a pediatric procedure to arrest bone growth at the physis (growth plate) to correct leg length discrepancy, unlike osteotomy which cuts fully formed, mature bone.
Distraction osteogenesis — a process of generating new bone by slowly pulling apart the two segments created by an osteotomy using an external fixator (e.g., Ilizarov technique) for limb lengthening.
Malunion — a fracture that has healed in an abnormal or misaligned position, which is a primary indication for a corrective osteotomy to restore normal anatomy (ICD-10-CM M84.051A, M84.052A).
Nonunion — a fracture that has failed to heal, sometimes treated with osteotomy to refresh the bone ends, realign mechanical forces, and apply rigid fixation (ICD-10-CM M84.151A, M84.152A).
Callus — the new, temporary bony and cartilaginous tissue that forms across the osteotomy site during the biological healing process before remodeling into mature lamellar bone.
Osteoarthritis — degenerative joint disease often treated with joint-preserving osteotomies (like HTO) to shift weight-bearing forces away from the damaged compartment and delay joint replacement (ICD-10-CM M17.11, M17.12).
Genu varum / Genu valgum — bowleg and knock-knee deformities, respectively, which are common mechanical indications for corrective femoral or tibial osteotomies (ICD-10-CM M21.161, M21.261).
Fluoroscopy — real-time X-ray imaging used as the primary intraoperative diagnostic tool for guiding the precise angle and depth of the bone cut during the procedure.
Left side (used to specify laterality for paired bones/extremities)
⚠️ Coding Note: When coding osteotomy procedures, precise anatomic specificity is critical; CPT codes are strictly divided by the specific bone (e.g., femur vs. tibia) and the exact segment of the bone (e.g., shaft vs. distal/supracondylar vs. proximal). Always append laterality modifiers -RT or -LT (or -50 for bilateral procedures) as required by payers for paired extremities, and sequence the primary underlying diagnosis (e.g., osteoarthritis M17.11 or malunion M84.051A) first, followed by any secondary mechanical deformity codes. Undercoding Alert: If an opening wedge osteotomy is performed and a structural bone graft (allograft or autograft from a separate site) is placed into the defect, the graft harvesting/placement is often not included in the primary osteotomy code and must be reported separately (e.g., 20900-20902 or 20930-20931); documentation triggers for a query include phrases like “opening wedge with structural allograft” or “iliac crest autograft harvested.” Finally, ensure that the operative note clearly documents whether internal fixation was applied, as this distinguishes between codes like 27448 (without fixation) and 27450 (with fixation), which significantly impacts reimbursement and prior authorization requirements.
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