Its main mechanical effect is to alter the position of the medial condyle or adjoining bone so that joint loading is redistributed. This can reduce excessive stress in an overloaded compartment and improve the relationship between the joint surfaces. The intended result is better mechanical function while correcting an angular deformity or a localized structural abnormality.
Joint congruence refers to how accurately opposing joint surfaces fit together. After repositioning, restoring this relationship helps the joint move on a mechanically appropriate path and supports more even load transfer. Inadequate congruence can compromise the intended correction, so alignment must be planned with attention to the joint surface and surrounding cartilage.
The operative plan must protect the articular cartilage, stabilizing ligaments, and nearby neurovascular structures while the bone segment is cut and repositioned. These tissues are important because cartilage contributes to the joint surface, ligaments support stability, and neurovascular structures can be vulnerable near the surgical field. Their preservation supports safe correction and functional recovery.
The procedure may be considered when an angular deformity, compartment overload, or localized structural abnormality affects joint mechanics. Its purpose in these settings is not simply to move bone, but to correct the alignment contributing to abnormal loading or impaired joint function. The specific correction depends on the location and nature of the structural problem.
Planning establishes the precise bone segment to remove or open and determines how the condylar fragment or adjoining bone should be shifted. The osteotomy is then created, the planned correction is positioned, and fixation secures the new alignment. Throughout these steps, surgeons account for joint congruence and protect cartilage, ligaments, and neurovascular structures.
Fixation maintains the intended position while the osteotomy heals. Stable healing is therefore necessary to preserve the planned alignment rather than allowing the correction to change during recovery. Even with an accurately positioned fragment, failure to maintain stability can interfere with restoration of joint congruence, load distribution, and movement.
Effectiveness is assessed by whether the procedure restores alignment, improves joint congruence, redistributes mechanical load, and supports movement. These outcomes reflect both structural and functional success. A correction that looks appropriate but does not heal stably or restore useful joint motion may not achieve the intended clinical value of the operation.