In my practice, I often see knee injuries that patients initially describe as “just a bad twist” or “a very painful sports injury.” But sometimes the real problem is much more serious. A multiligament knee injury means that two or more of the major stabilizing ligaments of the knee have been torn or badly damaged. In some patients, this pattern is associated with a true knee dislocation, even if the knee has already slipped back into place before they reach a hospital. [1][2][3]
One important point I want Bangladeshi patients and families to understand is this: multiligament knee injury is not the same as a routine ligament sprain. It can threaten not only knee stability, but also blood flow to the leg and nerve function around the foot and ankle. [1][2][3] That is why proper emergency assessment, imaging, follow-up, and treatment planning matter so much.
For patients in Dhaka and across Bangladesh, these injuries often happen after road traffic accidents, motorcycle crashes, falls from height, sports trauma, or severe twisting injuries. I also see cases where the knee looks less dramatic by the time the patient arrives, but the internal damage is still major. [1][2]
What is a multiligament knee injury?
The knee is stabilized by four major ligaments:
- anterior cruciate ligament, or ACL
- posterior cruciate ligament, or PCL
- medial collateral ligament, or MCL
- lateral collateral ligament, or LCL
There are also important corner structures, especially the posterolateral corner and posteromedial corner, which contribute to stability. A multiligament injury happens when at least two of these key stabilizers are injured together. [1][3]
Why these injuries are more serious
An isolated ligament tear may still be painful and disabling, but a multiligament injury creates a much more unstable knee. It can affect:
- front-to-back stability
- side-to-side stability
- rotational control
- walking confidence
- future cartilage and meniscus health
Most importantly, severe multiligament injuries may also be associated with popliteal artery injury or peroneal nerve injury, which can become limb-threatening if missed. [1][2][3]
How these injuries usually happen
When I evaluate patients with this problem, I often find a significant force in the history.
Common causes in Bangladesh
- motorcycle or road traffic accidents
- dashboard injury in a car crash
- fall from stairs, roof, or height
- sports collisions, especially football or contact injuries
- severe twisting or hyperextension trauma
PCL-related trauma, for example, often happens when a bent knee strikes a dashboard or takes a direct blow from the front. [4] In real life, these injuries often do not stay limited to one ligament. A high-force event may damage several structures at once.
Symptoms patients and families may notice
The symptoms can be obvious, but not always.
Common early symptoms
- severe knee pain
- rapid swelling
- inability to bear weight
- feeling that the knee is unstable or “out of place”
- bruising around the knee
- limited bending or straightening
Warning symptoms that need urgent attention
- cold foot
- pale or bluish toes
- numbness in the leg or foot
- inability to lift the foot upward
- weak or absent pulses
- severe swelling that keeps worsening
I usually explain to my patients that even if the knee looks “back in place,” the danger is not over. About half of knee dislocations may reduce spontaneously before medical evaluation, which means a serious vascular or nerve injury can still be missed if the assessment is not careful. [2]
Why urgent assessment is so important
Multiligament knee injury with dislocation is one of the most important orthopedic emergencies around the knee.
Blood vessel injury can be hidden
The popliteal artery behind the knee is especially vulnerable. Damage to this artery can reduce blood flow to the leg and, in severe cases, can lead to limb loss if treatment is delayed. [1][2][3] One challenging point is that a patient may still have some pulses because collateral blood flow can partially mask a serious arterial injury. [2]
Nerve injury can affect foot function
The common peroneal nerve may also be injured, especially in severe dislocation patterns. This can cause numbness over the upper foot or weakness lifting the ankle and toes. [1][2]
Because of these risks, I do not consider a suspected multiligament knee injury a wait-and-watch problem in the early phase.
How I evaluate a suspected multiligament knee injury
When I evaluate patients with this problem, I focus first on safety, then on defining the exact ligament pattern.
History and physical examination
I want to know:
- how the injury happened
- whether the knee looked deformed at the scene
- whether the patient felt a shift or dislocation
- whether the foot became numb, cold, or weak
- whether swelling appeared quickly
- whether the patient could stand or walk afterward
On examination, I assess:
- knee alignment
- swelling and bruising
- ligament stability
- pulses in the foot
- skin condition
- sensation and motor function of the foot and ankle
Imaging and vascular assessment
The exact evaluation depends on the patient’s condition, but commonly includes:
X-rays
X-rays help rule out associated fractures and confirm whether the knee joint is aligned. [5]
MRI
MRI is very useful for identifying which ligaments, menisci, cartilage surfaces, and soft tissues are injured. It helps us build the reconstruction plan once the patient is stabilized.
CT angiography or vascular imaging
If there is concern about blood flow, vascular imaging may be needed urgently. Mayo Clinic notes that neurovascular assessment is essential and that CT angiography is often required to confirm that adequate blood flow is maintained in the limb. [5] StatPearls also notes that the ankle-brachial index should be checked in suspected knee dislocation, and a low value should lead to further vascular investigation. [2]
Early management in the emergency phase
The first stage of treatment is not always ligament surgery. The priority is limb safety and knee stabilization.
Immediate priorities
- confirm or restore knee alignment
- assess blood supply before and after reduction
- check nerve function
- control pain and swelling
- protect the knee with immobilization
