Malunion Surgery: Treatment for Deformities After Fractures
Bone healing after a fracture is a natural but complex biological process; however, it does not always result in perfect anatomical alignment. When bones heal crookedly, twisted, or out of position, this condition is medically known as "malunion." Malunion can cause pain, limited mobility, and joint issues impacting daily life. Malunion surgery is an advanced orthopedic intervention designed to correct these deformities and restore both function and appearance of the affected limb.
Deformities developing after fractures affect not only the bone structure but also surrounding soft tissue, muscle balance, and neighboring joint health. Even minor deviations in weight-bearing bones of the lower limbs can increase the risk of osteoarthritis over time. Therefore, surgical planning focuses not only on correcting the bone but also on restoring overall biomechanical balance.
What Is Malunion?
Malunion refers to the healing of fractured bone ends without proper anatomical alignment. It can manifest as angular deformities, rotational (twisting) abnormalities, or shortening of the bone. For a detailed overview, please see our blog post on What is Malunion and How Is It Treated.
Malunions are generally classified into three main types: angular deformities, rotational deformities, and combined deformities with shortening. Visualizing these deformities is important to understand the problem.
Causes of Malunion After Fracture
Several factors can contribute to malunion after a fracture. The most common cause is inadequate initial fracture reduction—when bone fragments are not properly aligned—or failure to maintain this alignment with casts or fixation devices. Complex fractures with multiple fragments or severe soft tissue injury present additional challenges to maintaining bone integrity.
Other contributing factors include poor bone quality, smoking, diabetes, systemic illnesses, or infection, all of which can negatively affect healing. In children, fractures involving growth plates may initially heal correctly but lead to deformities later due to asymmetric growth.
Diagnostic Process and Radiological Evaluation
Accurate surgical planning requires a thorough diagnostic process. Physical examination includes gait analysis, joint range of motion assessment, and measurement of limb length discrepancies. To fully understand the deformity’s geometry, advanced imaging beyond standard X-rays is necessary.
Radiological evaluation involves computed tomography (CT) scans, which provide three-dimensional views of the deformity. CT is especially critical in detecting rotational abnormalities. Below are images showing the radiological methods used in diagnosing malunion.
Surgical Treatment Options
Surgical treatment for malunion is tailored based on deformity severity, location, and patient expectations. Malunion surgery techniques range from simple corrections to complex reconstructions. While some principles overlap with nonunion surgery and treatments, malunion surgery primarily focuses on reshaping the existing bone.
Treatment decisions consider whether the deformity involves a single plane or multiple planes. The decision tree below provides an overview of treatment options.
For example, lower limb deformities such as leg bowing are generally addressed with lower limb deformity surgeries, whereas upper limb and wrist issues are treated with upper limb lengthening and deformity correction procedures. When significant shortening accompanies the deformity, bone lengthening surgery details may also be incorporated. Recent advances in technology have expanded modern surgical options for malunions, improving recovery experiences.
Osteotomy Techniques
Osteotomy is the controlled surgical cutting of bone to correct deformities, allowing the bone to heal in a proper angle. Techniques include closing wedge, opening wedge, or dome osteotomy. The schematic below illustrates the basic steps of an osteotomy procedure.
Fixation Methods
After osteotomy, the bone needs to be stabilized in its new position. This is commonly achieved with internal fixation using plates and screws or intramedullary nails. Internal fixation allows early mobility without external hardware visible outside the body.
Ilizarov and Circular External Fixators
In complex, multi-plane deformities or cases with infection risks, external fixators such as the Ilizarov system may be used. These devices allow gradual postoperative adjustments to the bone’s position and alignment. Computer-assisted (hexapod) systems enable millimetric corrections even after surgery.
Risks and Potential Complications of Surgery
As with any surgery, malunion correction carries risks including infection, bleeding, anesthetic complications, and nerve injury. Specific risks include nonunion (failure of the osteotomy to heal) or inadequate correction of the deformity.
Recovery and Rehabilitation
Postoperative success depends heavily on comprehensive rehabilitation alongside the surgical technique. Recovery time ranges from 3 to 6 months depending on the intervention and bone healing rates. Our guide on malunion surgery recovery can help patients understand what to expect.
Physical therapy is essential to maintain joint motion and rebuild muscle strength.
Regular follow-up appointments and radiological monitoring track bone healing progress, with gradual weight bearing introduced as appropriate.
The information provided is for general informational purposes only and does not constitute medical advice. It is not a substitute for individual diagnosis, treatment, or guidance by a qualified healthcare professional. Diagnosis and treatment should only be planned following an in-person examination by a physician. Since each patient’s clinical condition is unique, surgical or non-surgical procedures may vary accordingly. The content is based on current scientific sources and up-to-date medical approaches. Do not delay seeking professional medical care based on this information.