KNEE · MULTI-LIGAMENT INJURY

Multi-ligament knee injury: the one where checking the pulse matters more than the MRI.

When two or more knee ligaments tear together, the knee has usually dislocated, even if it went back in by itself. That carries a risk to the artery behind the knee which has to be excluded within hours. This guide explains why these injuries get missed, what the assessment must include, and how they are actually reconstructed.

Dr. Prashant Parate · Shoulder, Knee & Sports Injury Surgeon · In orthopaedic practice since 2010, DNB-qualified since 2012 · Jupiter Hospital (Baner) & Sainath Hospital (Moshi, PCMC) · Reviewed July 2026

---

What counts as a multi-ligament injury

Your knee is held together by four main ligaments. The ACL and PCL cross inside the joint and control forward and backward movement. The MCL on the inner side and the LCL with the posterolateral corner on the outer side control sideways opening and rotation.

A multi-ligament injury means two or more of these are torn. The combinations we see most often are ACL with MCL, ACL with PCL, ACL and PCL with MCL, and ACL and PCL with the outer side. Each combination behaves differently and needs a different plan.

Here is the fact that changes everything. For both cruciates to tear, the knee has almost always dislocated, meaning the joint surfaces came completely apart. Roughly half of these dislocations relocate spontaneously before anyone examines the knee, so the patient arrives with a swollen knee, a normal-looking X-ray, and a dislocation nobody witnessed. The injury is treated as a sprain, and the real danger is missed.

The artery behind the knee

The common peroneal nerve, which wraps around the outer side of the knee, is also at risk, particularly when the outer side of the knee is injured. Damage to it causes foot drop, an inability to lift the front of the foot. Some recover, some do not, and it should be documented at the first examination rather than discovered later.

How these injuries happen here

Two-wheeler accidents are the commonest cause in our practice, and often the knee is only one of several injuries, which is precisely why it gets overlooked while attention goes to more obvious fractures.

Dashboard injuries, where the knee strikes the dashboard in a car collision, driving the shin bone backwards and tearing the PCL first.

Sport, particularly kabaddi, football and contact sport, where a twisting fall with the foot planted can take out more than one ligament.

Falls from height, and industrial or agricultural accidents.

Why it gets missed

• The knee relocated on its own, so nobody saw a dislocation.
• The X-ray is normal, because ligaments do not show on X-ray.
• The knee is too swollen and painful to examine properly on the day, and nobody re-examines it once the swelling settles.
• There are other injuries taking priority, especially after a road accident.
• Pulses were present at first, and the artery blocked off hours later.

The practical consequence: any knee that was grossly unstable at the time of injury, or that opens up in more than one direction when examined, should be assumed to be a multi-ligament injury until proven otherwise.

Assessment, in order

Priority	What is checked
First, urgently	Pulses in the foot, ankle-brachial index, and CT angiogram where there is any doubt. Nerve function, particularly the ability to lift the foot.
Then	X-rays for fractures and for bony avulsions, which change the treatment considerably.
Then	Examination of each ligament in turn, repeated once swelling allows, and often under anaesthesia.
Then	MRI to map every structure: both cruciates, both sides, meniscus, cartilage and the posterolateral corner.
In chronic cases	Full-length standing alignment films, because a knee that has been unstable for months often develops a deformity that must be corrected or the reconstruction will fail.

Timing: the decision that shapes the result

What the reconstruction involves

Most of the work is arthroscopic, with open exposure where the outer or inner side needs direct repair. Graft is needed for each ligament being reconstructed, which in a two or three ligament knee means planning the graft supply carefully. Hamstring, peroneus longus, quadriceps and donor tissue all have a role, and the choice depends on how many grafts are needed and what the patient can spare.

Order matters within the operation. Tunnels for different ligaments can collide if they are not planned together, and getting the sequence and the tensioning right is what determines whether the knee ends up stable. Meniscus tears are repaired at the same time wherever possible, since a knee that has been through this needs every shock absorber it has.

In chronic cases with deformity, a bow-legged knee that has been unstable for a long time may need realignment by osteotomy before or alongside the ligament work. Reconstructing ligaments in a limb that is still driving load through the injured side is a reconstruction set up to stretch out.

Recovery, honestly

Stage	What happens
Week 0 to 6	Brace, protected weight-bearing, and controlled movement. The balance here is delicate: too much protection and the knee stiffens, too little and the reconstruction stretches.
Week 6 to 12	Progressive weight-bearing and range. Quadriceps work becomes the priority, since this muscle wastes rapidly after these injuries.
Month 3 to 6	Strengthening in earnest, balance and control work. Most daily activity returns during this period.
Month 6 to 12	Sport-specific work where relevant. Return to demanding activity is generally around nine to twelve months, and sometimes longer.

Two honest points. Stiffness is the commonest problem after these operations, more common than the reconstruction failing, which is why early controlled movement matters so much. And the realistic goal for most patients is a stable knee for work and daily life, not a knee identical to the one before the accident. Many do return to sport. Setting that expectation accurately before surgery matters more here than in almost any other knee operation.

Cost and insurance in Pune

Multi-ligament reconstruction in Pune typically ranges between ₹2.5 and ₹5 lakh, varying with how many ligaments are reconstructed, graft and implant requirements, whether it is staged, hospital category and length of stay.

These are almost always accident-related, which matters for your claim. Tell your insurer clearly that this followed a specific injury, keep the accident documentation, and where a road traffic accident is involved, the police report and any motor insurance claim may also be relevant. Begin pre-authorisation early, since staged surgery needs approval for both stages.

Indicative ranges, not quotations. An exact estimate follows assessment and imaging.

Frequently asked questions

My knee dislocated but went back by itself. Do I still need all this?

Yes, and this is the single most important message on this page. A knee that relocated spontaneously sustained exactly the same forces as one that needed relocating in hospital. The ligament damage is the same and the risk to the artery is the same. It needs the same assessment.

Can a multi-ligament injury be treated without surgery?

Rarely, and generally with a poor result. A knee with two or more torn ligaments is usually unstable enough to prevent normal walking, and continuing on it damages the meniscus and cartilage. Non-operative treatment is reserved for patients whose general health makes surgery unsafe, or for very low-demand situations.

It has been six months since my accident. Is it too late?

Not too late, but different. Chronic multi-ligament injuries can be reconstructed with good results, though the operation is bigger, deformity may need correcting first, and bony avulsions that could have been fixed simply early on now need reconstruction. If your knee is unstable, get it assessed rather than assuming the window has closed.

Why has my foot drop not recovered?

The common peroneal nerve is stretched or torn in a proportion of these injuries, particularly when the outer side of the knee is involved. Recovery is variable and can take many months. Some recover fully, some partially, and some not at all. A brace to hold the foot up allows normal walking meanwhile, and there are surgical options if recovery does not occur.

Will I need more than one operation?

Sometimes, and it is planned rather than a sign that something went wrong. Staging allows the urgent structures to be dealt with immediately while the knee regains movement before the cruciates are reconstructed. Some patients also need a later procedure for stiffness or for a meniscus problem.

Will I get arthritis in this knee?

The risk is higher than after a single ligament injury, because the cartilage and meniscus are often damaged at the same moment and because the knee was unstable for a period. Good reconstruction, meniscus preservation and correcting alignment all reduce that risk, which is part of why these injuries deserve proper treatment rather than being left.

Key takeaways

• Two or more torn ligaments usually means the knee dislocated, even if it went back on its own.
• The artery behind the knee must be assessed first, and it can block off hours after looking normal.
• A normal X-ray does not exclude any of this.
• Bony avulsions and the posterolateral corner should be dealt with early. Cruciates can often wait.
• Stiffness is the commonest problem afterwards, which is why controlled early movement matters.
• Chronic cases can still be reconstructed, but deformity may need correcting first.

This page is patient education, not a substitute for consultation. A suspected knee dislocation is a medical emergency and needs immediate hospital assessment. Last medically reviewed: July 2026 by Dr. Prashant Parate, DNB Orthopaedics, Fellowship in Arthroscopy & Sports Medicine (Thammasat University Hospital, Thailand). MMC Reg. 2006042129.