Proximal Tibial Valgus Osteotomy: Lateral Closing Wedge

Area of Science:

• Orthopedic Surgery
• Biomechanics
• Knee Osteoarthritis Treatment

Background:

• Valgus-producing high tibial osteotomy (HTO) is a key treatment for active patients with knee varus malalignment and medial osteoarthritis (OA).
• Achieving ideal lower-extremity mechanical axis alignment is crucial for the long-term success of HTO by ensuring even load distribution.
• Lateral closing wedge proximal tibial valgus osteotomy (CWO) is a precise technique for correcting varus deformity.

Purpose of the Study:

• To detail the surgical technique of lateral closing wedge proximal tibial valgus osteotomy (CWO).
• To evaluate the effectiveness of CWO in improving knee function, reducing pain, and postponing knee replacement.
• To identify factors influencing CWO outcomes, such as patient demographics and disease severity.

Main Methods:

• Preoperative assessment of varus deformity using whole-leg radiography.
• Surgical steps including anterolateral incision, peroneal nerve management, osteotomy with a calibrated guide, wedge removal, and fixation with step staples.
• Fluoroscopic guidance throughout the osteotomy procedure.

Main Results:

• CWO achieves desired overcorrection of 3° to 7° valgus.
• Complications like nonunion, infection, and peroneal neuropathy are rare.
• Improved knee function and reduced pain observed post-surgery.
• Male patients with early-onset OA show significantly lower failure rates than women with degenerative disease.
• Approximately 75% survival rate at 10 years (vs. knee replacement).
• CWO postpones total knee arthroplasty (TKA) by a median of seven years.

Conclusions:

• Lateral closing wedge osteotomy (CWO) is an effective surgical technique for correcting knee varus alignment in active patients with medial compartment osteoarthritis.
• The procedure leads to significant improvements in knee function and pain reduction, with a substantial delay in the need for total knee arthroplasty.
• Patient selection, particularly considering age and sex, influences long-term outcomes, with younger males demonstrating better results.