Knee Dislocations: Diagnosis & Treatment by a Trusted Austin Knee Dislocation Doctor
What are knee dislocations?
Knee dislocations are different and much more serious injuries than a dislocated patella or kneecap dislocation. Unlike a kneecap dislocation, which involves the patella slipping out of the trochlear groove of the patellofemoral joint, a knee dislocation involves the complete disruption of the bone joint between the femur (thigh bone) and tibia (shin bone). This results in a complete disassociation of the tibiofemoral articulation, causing severe instability of the knee joint and often involving damage to multiple ligaments, including the ACL, PCL, MCL, and LCL, which requires an Austin knee dislocation doctor with expertise in severe joint injuries and experience with multi-ligament reconstructions.
A dislocated knee is a medical emergency due to the high risk of vascular injury, particularly to the popliteal artery, and nerve injury, most commonly affecting the peroneal nerve, which supplies motor and sensory function to the lower leg. The medial capsule, a key stabilizer of the knee on the medial side, is often damaged in these injuries, along with multiple ligament injuries, including anterior dislocations and posterior dislocations involving the anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL). This degree of instability is usually associated with multiple ligament injuries and often involves damage to the medial femoral condyle, cartilage injuries, and soft tissue injuries.
The epidemiology of knee dislocations shows that although these injuries are rare, they carry a significant risk of complications such as vascular compromise and peroneal nerve injury. Knee dislocations can occur from high-energy trauma like motor vehicle collisions or dashboard injuries, but can also result from low-energy mechanisms, especially in patients with risk factors such as obesity or ligamentous laxity.
Due to the unstable kneecap and overall knee instability following dislocation, patients often experience severe knee pain, knee bending, a popping sound, and a visibly deformed, painful knee. Prompt surgical exploration and intervention are critical to restore the knee’s stability, protect the blood flow to the lower leg, and prevent long-term disability. Treatment often involves the use of an external fixator to stabilize the joint before reconstructive surgery, with initial diagnosis guiding the approach by an experienced Austin knee dislocation specialist.
Knee dislocations represent a complex and severe injury involving multiple ligament injuries, vascular injury risk, and significant soft tissue damage, requiring urgent diagnosis through thorough physical examination and diagnostic tests, as well as comprehensive surgical treatment using the latest technology in sports medicine and orthopedic surgery settings.
Traumatic knee dislocation injuries, especially those involving the medial collateral ligament, anterior cruciate ligament dislocations, or posterior cruciate ligament dislocations, are classified as some of the most serious orthopedic injuries due to the potential for neurovascular injury, including popliteal artery damage and peroneal nerve injury, and long-term dysfunction such as arthritis and recurrent patella dislocation.
These injuries require an Austin knee dislocation surgeon who is board-certified in orthopedic surgery, has completed a formal fellowship in sports medicine or orthopedic trauma, and has access to advanced imaging and vascular surgery backup.
What are the common causes of knee dislocations?
The most common cause of a traumatic knee dislocation is high-energy trauma, such as motor vehicle collisions, dashboard injury, sports-related injuries, accident-associated injuries, or a fall from height. These types of knee dislocation injuries often involve associated fractures, such as tibial plateau fractures, and result in complex, multi-trauma injuries that require immediate evaluation, including a CT scan to assess the extent of damage. Less commonly, athletic injuries or a hyperextension injury to a flexed knee can also cause knee dislocations.
Knee dislocation common symptoms
A knee dislocation typically results in an immediate, painful knee feeling and an inability to bear weight on the affected limb. The knee dislocation injury often occurs with an obvious deformity, swelling, numbness, tingling, or the kneecap patella popping out of place, which differentiates it from a simple patellar dislocation and may involve a torn medial patellofemoral ligament.
Patients may report the sensation of the dislocated patella or an unstable kneecap. Depending on the extent of the injury, peroneal nerve injury and vascular injury, particularly popliteal artery injury, are common and can lead to vascular compromise. This arterial injury risk necessitates urgent vascular surgery consultation to prevent limb-threatening ischemia and may require same-day intervention. Knee dislocations can result from sports injuries, falls, or overexertion, and evaluation by Austin knee dislocation surgeon is critical.
In some cases, valgus force or hyperextension injury mechanisms contribute to the dislocation. If untreated, serious complications such as compartment syndrome or deep venous thrombosis may develop, further endangering the affected leg. Prompt evaluation in the emergency department, including physical examination, review of medical history, and imaging like magnetic resonance imaging, is essential for diagnosis and to guide surgical treatment, and rehabilitation planning while ruling out other conditions.
How is a knee dislocation diagnosed?
Patients with an acute knee dislocation are usually first seen in the emergency department, given the urgency of potential blood vessel injury and concerns about vascular compromise. Immediate reduction or closed reduction of the dislocated joint is essential in emergency medicine, followed by stabilization with a knee immobilizer. X-rays are taken to confirm joint alignment and assess for associated fractures, including tibial plateau fractures. Magnetic resonance imaging (MRI) is then used to evaluate cartilage injuries, knee ligament injuries, and other structural damage, playing a crucial role in surgical treatment planning and helping M. Tyrrell Burrus, MD, an Austin knee dislocation doctor, to prescribe medications and guide care.
Studies to detect blood vessel injury and identify popliteal artery injury, such as examining the dorsalis pedis arteries and measuring the ankle-brachial index, are critical to rule out limb-threatening arterial injury. Advanced imaging, like computed tomography angiography, may be employed when vascular compromise is suspected.
In some cases, a multiligament knee injury or even KD IV injuries may be diagnosed, reflecting the severity and complexity of the dislocation. Given the risk factors and epidemiology of knee dislocations, prompt and accurate diagnosis is vital to prevent long-term complications such as neurovascular injury and knee joint instability, and to guide non-surgical treatments including pain medications, physical therapy, or platelet-rich plasma injections when appropriate.
How is a dislocated knee treated by an Austin knee dislocation surgeon?
Effective treatment of knee dislocations requires a comprehensive approach by an Austin knee dislocation specialist and sports medicine surgeon due to the complexity and severity of these injuries. Unlike a simple dislocated patella, a complete dislocation of the knee joint frequently involves multiple ligament injuries, including the ACL, PCL, MCL, and LCL, vascular compromise, particularly to the popliteal artery, and potential nerve damage such as peroneal nerve injury.
Given the high risk of neurovascular injury, including common peroneal nerve injury, and associated soft tissue damage, immediate evaluation in the emergency department with advanced imaging is critical. The treatment strategy often balances urgent vascular surgery to restore arterial blood supply with subsequent orthopedic surgical interventions, including ligament reconstruction and repair of large capsular injuries. Non-operative management is uncommon because it rarely restores full knee stability or function, especially in cases involving multiligamentous injury, and total knee joint replacement may be considered for chronic cases..
Rehabilitation plays a pivotal role in recovery, aiming to restore sensory and motor function, prevent complications like arthrofibrosis, and return patients to their pre-injury activity levels, including playing sports, through specialized physical therapy coordinated with the surgical team and guided by Austin knee dislocation doctor expertise.
This multidisciplinary approach, guided by an understanding of the epidemiology of knee dislocations and tailored to individual risk factors and injury patterns, is essential for optimal outcomes and comprehensive care.
Non-surgical treatment
Compared to a patellar tendon rupture or dislocated kneecap, non-operative treatment is rare for traumatic knee dislocations. Due to the severity of multi-trauma injuries and the degree of dysfunction, instability, and pain that results, surgical treatment is usually required. Even with prolonged brace use and intensive physical therapy, full restoration of sensory and motor function is often unachievable without surgical intervention.
Surgical treatment
Vascular surgery may be urgently needed for vascular repair or surgical revascularization in cases of arterial injury. For ligament reconstruction and repair of large capsular injuries or multiligamentous injuries, M. Tyrrell Burrus, MD, a fellowship-trained knee dislocation doctor, typically waits 1–2 weeks to allow for swelling to subside and some healing of soft tissue injuries. Some complex cases involving irreducible posterolateral dislocation or dynamic tendon transfer may require multiple surgical procedures to restore the knee to its pre-injury state.
Prompt rest, ice packs, and pressure management are critical initial steps before surgical intervention and rehabilitation exercises to restore function and support an active lifestyle.
Rehabilitation and Recovery
Rehabilitation after surgical treatment is highly demanding and tailored to the individual’s injury and recovery progress. Early postoperative care focuses on protecting the surgical repair and maintaining the range of motion, while later stages emphasize strengthening the muscles around the knee and improving functional mobility.
Reconstructive surgery in these cases often involves advanced orthopedic surgery techniques. Understanding the epidemiology of knee dislocations and associated injuries is essential in creating a personalized treatment plan.
Knee dislocation treatment options
Treatment for knee dislocations depends on the severity of the injury, the presence of vascular or nerve damage, and the stability of the knee joint. Initial evaluation and physical examination are critical to identify any vascular injury, such as popliteal artery injury, or neurological deficits like peroneal nerve injury. Immediate acute reduction or closed reduction is often necessary to restore blood supply to the affected leg and prevent further complications.
Treatment options for knee dislocations include closed reduction, bracing, or reconstructive surgery. Cortisone injections may be used cautiously as they can weaken cartilage and lead to arthritis.
Explore our comprehensive video series on knee dislocation treatment options, surgical techniques, and rehabilitation strategies to better understand your journey to recovery.
Complications of knee dislocations
Knee dislocations are serious injuries that carry a high risk of complications, many of which can have long-term effects on knee function and overall limb health. One of the most critical complications is vascular injury, particularly to the popliteal artery. Popliteal artery injury occurs in approximately 5% to 15% of knee dislocations and can lead to vascular compromise, threatening the blood supply to the lower leg. Prompt recognition and vascular surgery intervention are essential to prevent limb-threatening ischemia and potential amputation.
Peroneal nerve injury is another common complication, occurring in 10% to 40% of cases. This nerve injury can result in sensory and motor deficits affecting the lower leg and foot, sometimes requiring dynamic tendon transfer or nerve repair during reconstructive surgery. Partial recovery of nerve function is possible in about half of affected patients.
Arthrofibrosis, or joint stiffness, is the most frequent complication following knee dislocation, affecting up to 38% of patients. Early mobilization and specialized rehabilitation coordinated with the surgical team are critical to minimizing this risk. Additionally, some degree of knee instability persists in up to 37% of cases, although redislocation is uncommon. Management of instability ranges from bracing to revision knee surgery.
Other complications include compartment syndrome and deep venous thrombosis (DVT), both of which require immediate medical attention to prevent long-term disability or life-threatening events. Associated fractures, such as tibial plateau fractures, and soft tissue injuries like patellar tendon rupture, can further complicate recovery and surgical treatment.
Understanding the epidemiology of knee dislocations and their complications helps guide the initial evaluation, surgical treatment, and rehabilitation strategies to optimize patient outcomes and restore knee joint stability and function. Patients experiencing these symptoms should promptly contact an Austin knee dislocation doctor to visit for evaluation and treatment planning.
Knee Dislocation Treatment Options:
Schedule an Appointment Today With an Austin Knee Dislocation Doctor
If you are experiencing symptoms of knee dislocation, such as a painful knee, obvious deformity, or instability, a consultation with a specialist in Austin, TX, may be the first critical step towards accurate diagnosis, effective treatment, and recovery.
M. Tyrrell Burrus, MD is an experienced fellowship-trained surgeon specializing in knee surgery, including complex cases involving multiple ligament injuries, vascular injury, and patellar dislocation. His expertise in managing traumatic knee dislocations, performing reconstructive surgery, with experience in multi-ligament reconstructions, and coordinating vascular surgery when necessary ensures comprehensive care.
Prompt evaluation by a knee dislocation surgeon is essential in emergency medicine settings to assess neurovascular injury risk, including popliteal artery injury and peroneal nerve injury, which can threaten the blood supply to the lower leg. Utilizing advanced imaging techniques such as magnetic resonance imaging, ankle-brachial index measurements, and CT angiograms, Dr. M. Tyrrell Burrus tailors surgical treatment and rehabilitation plans to each patient’s unique injury pattern, ensuring timely intervention to prevent limb-threatening ischemia and optimize recovery outcomes.
Call (512) 324-9170 or fill out the form on this page to schedule an appointment with Dr. Burrus and begin your journey to recovery with expert orthopedic care focused on restoring knee stability and function.