Is your knee painful, unstable, or giving way after a twisting injury, sports trauma, or major impact?
When instability affects the outer or back part of the knee, especially after a high-impact injury, the posterolateral corner (PLC) may be involved. The PLC is a group of ligaments, tendons, and supporting soft tissue structures located on the outer back portion of the knee. These structures help control stability during twisting, pivoting, side-to-side movement, and changes in direction.
PLC injuries can be complex and often occur alongside injuries to the anterior cruciate ligament (ACL), posterior cruciate ligament (PCL), or other knee ligaments. If left untreated, they can lead to ongoing instability and may affect the success of other ligament reconstructions.
At Mubadala Health Dubai, our orthopedic and sports medicine specialists provide comprehensive evaluation and personalized treatment for PLC injuries, including advanced posterolateral corner reconstruction when surgery is needed.
Symptoms & Signs of a Posterolateral Corner Injury
A PLC injury usually occurs after significant trauma, such as a twisting sports injury, fall, direct impact, or road traffic accident.
Common symptoms include:
• Pain on the outer side or back of the knee
• Swelling after injury
• A feeling that the knee is unstable or gives way
• Difficulty walking on uneven surfaces
• Difficulty pivoting, turning, or changing direction
• Reduced strength or confidence in the affected leg
• Knee instability during side-to-side movement
• Symptoms linked with ACL, PCL, or other ligament injuries
Because PLC injuries often occur with other knee ligament damage, a detailed assessment is important to understand the full injury pattern.
Diagnosis & Evaluation
Accurate diagnosis is essential because PLC injuries can sometimes be missed, especially when they occur alongside ACL or PCL tears.
At Mubadala Health Dubai, evaluation may include:
• Detailed medical history and review of how the injury occurred
• Physical examination to assess knee stability, alignment, and movement
• Specific clinical tests to evaluate posterolateral corner stability
• X-rays to assess bone alignment or associated injury
• MRI scan to evaluate the PLC, ACL, PCL, meniscus, cartilage, and surrounding soft tissues
• Additional imaging when needed to assess complex injury patterns
• Review of activity level, previous knee injuries, and recovery goals
Early diagnosis is especially important because an untreated PLC injury can place additional stress on the ACL or PCL and may increase the risk of reconstruction failure if not addressed.
Treatment & Management
Treatment depends on the severity of the PLC injury, knee stability, associated ligament damage, activity level, and overall knee health.
Minor or partial PLC injuries may be treated without surgery. Non-surgical care may include:
• Rest and activity modification
• Knee bracing to support healing
• Pain and swelling management
• Physiotherapy to restore strength and control
• Gradual return to activity under specialist guidance
Surgery is more commonly recommended for complete PLC tears, persistent instability, or injuries that occur together with ACL, PCL, or other ligament damage.
Posterolateral Corner Reconstruction Surgery
Posterolateral corner reconstruction is a surgical procedure used to restore stability to the outer back part of the knee when the PLC structures are severely damaged.
During the procedure, damaged ligaments and supporting structures are reconstructed using tendon grafts. The goal is to restore knee stability, improve alignment and control, and reduce abnormal movement that may place stress on other ligaments.
PLC reconstruction may be performed on its own or alongside ACL, PCL, or multiligament knee reconstruction, depending on the injury pattern. When appropriate, arthroscopic or minimally invasive techniques may be used as part of the surgical plan to reduce tissue disruption and support recovery.
Recovery & Rehabilitation
Recovery after PLC reconstruction is gradual and carefully supervised, particularly when more than one ligament has been repaired or reconstructed.
A structured rehabilitation program may focus on:
• Protecting the reconstruction during healing
• Reducing pain and swelling
• Restoring knee range of motion
• Rebuilding strength
• Improving balance and control
• Supporting safe walking and weight-bearing
• Gradually returning to daily activity, exercise, or sport
• Reducing the risk of re-injury
Recovery timelines vary depending on the severity of the injury, whether other ligaments were reconstructed, and individual healing progress. Your care team will guide each stage of rehabilitation based on knee stability, strength, movement quality, and activity goals.
Why Early Treatment Matters
PLC injuries can cause ongoing knee instability if they are not diagnosed and treated properly. Over time, this may increase the risk of recurrent injury, cartilage damage, meniscus injury, abnormal knee mechanics, and early joint wear.
Early specialist assessment helps identify the full extent of the injury and determine whether bracing, rehabilitation, reconstruction, or combined ligament surgery is needed to restore long-term stability.
When Should You See a Specialist?
You should consider seeing an orthopedic or sports medicine specialist if you experience:
• Pain on the outer side or back of the knee after injury
• Knee instability or repeated giving way
• Difficulty walking on uneven ground
• Difficulty pivoting, turning, or changing direction
• Swelling after a sports injury, fall, or road traffic accident
• A known or suspected ACL or PCL injury
• Reduced confidence in the knee during movement
• Symptoms that do not improve with rest or physiotherapy
Prompt evaluation is especially important after high-impact injuries or when more than one knee ligament may be involved.
The posterolateral corner is a group of ligaments, tendons, and supporting structures on the outer back portion of the knee. It helps control stability during twisting, pivoting, and side-to-side movement.
No. Mild or partial PLC injuries may be treated with bracing, physiotherapy, and rehabilitation. Surgery is usually recommended for complete tears, persistent instability, or injuries associated with ACL, PCL, or other ligament damage.
Yes. PLC injuries commonly occur with ACL or PCL injuries. Identifying and treating the PLC injury is important because untreated PLC instability can place extra stress on other ligament reconstructions.
PLC reconstruction is a surgical procedure that uses tendon grafts to restore stability to the outer back part of the knee when the posterolateral corner structures are severely damaged.
Recovery varies depending on the severity of the injury and whether other ligaments are reconstructed at the same time. Most patients require several months of structured rehabilitation before returning to higher-level activity or sport.
Many patients can return to sport after PLC reconstruction and rehabilitation, but the timeline depends on the complexity of the injury, healing progress, strength, stability, and medical clearance.
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