Anterior Drawer Test

Overview

The anterior drawer test is a quick hands-on check that a doctor or physiotherapist does to see whether a ligament in your knee is torn or loose. The ligament is the anterior cruciate ligament (ACL) — a strong band of tissue that runs through the middle of the knee and helps stop your shin bone from sliding forward. For the test, you lie on your back with your knee bent. Your doctor holds your lower leg and gently pulls it towards them, then compares how far it moves with your other knee. If your shin slides further forward than expected, the result is called 'positive', which can be a sign of an ACL injury.

Yes. It is one of the standard knee checks used around the world whenever someone has a knee injury, knee pain or a knee that gives way. ACL injuries themselves are common, especially in sports that involve twisting, turning and jumping.

Anyone with a knee injury can have the test, at any age. ACL tears are most common in teenagers and young adults who play sports such as football, basketball, netball, rugby and skiing. They also happen in falls, road traffic accidents and awkward everyday twists. Children can injure the ACL too, though they are more likely to pull off a small flake of bone where the ligament attaches rather than tear it in the middle.

Symptoms

Common symptoms

• Knee pain and swelling after twisting, landing awkwardly or a direct knock
• A 'pop' or snap heard or felt at the moment of injury
• Swelling that comes on within a few hours of the injury
• The knee feeling loose, wobbly or 'giving way' when you walk or turn
• Not being able to put weight on the leg comfortably
• Trouble straightening or bending the knee fully

Symptoms in children

• Young children may not be able to describe the knee feeling unstable and may simply limp or stop using the leg
• Fast swelling can be the main sign, with fewer words to describe the pain
• In children the ligament may pull off a small piece of bone rather than tear, which doctors look out for
• Children can be frightened during the test, so having a parent close by and explaining what will happen helps

Symptoms in older adults

• Knee ligaments loosen naturally with age, so a slightly 'positive' test can be normal in an older knee
• Arthritis and old knee injuries can also make the knee feel unstable
• Other problems, such as a torn meniscus (the shock-absorbing pad in the knee), are more common in this age group
• Your doctor may rely more on your story and on scans than on this test alone

Causes

Main causes

• Twisting the knee while the foot is planted — common in football, basketball, netball and skiing
• Landing from a jump with a straight or turned-in knee
• A direct blow to the knee, such as in a tackle or a fall
• Stopping suddenly or changing direction at speed
• Road traffic accidents and falls
• Sometimes everyday movements, like stepping off a curb awkwardly

Risk factors

• Playing sports that involve pivoting, jumping and contact
• Being a female athlete — differences in knee alignment, muscle strength and hormones raise the risk
• A previous ACL injury or knee surgery
• Weak thigh muscles, or poor balance and landing technique
• Footwear with poor grip, or playing on certain surfaces
• Being tired, or going back to sport too soon after an injury

When to see a doctor

See a doctor urgently if:

• You cannot put weight on the leg at all
• Your knee swelled up within a few hours of an injury
• Your knee locks, clicks painfully or keeps giving way
• The knee is very painful and getting worse

Book a routine appointment if:

• Your knee keeps feeling unstable or giving way during everyday activities
• You have ongoing knee pain or swelling after an old injury
• You are planning to return to sport and want your knee checked first
• You have questions about a knee injury you had in the past

Diagnosis

The anterior drawer test is one part of a knee examination, not a test you do on your own. Your doctor will first ask how the injury happened and what your knee has been doing since. They will then look at both knees, watch you walk and move, and feel for swelling and tenderness. The drawer test comes next, and is always compared with your other knee. Your doctor may also do other knee tests and, if needed, arrange a scan.

Tests that may be done

• The anterior drawer test itself — your doctor gently pulls your lower leg forward with your knee bent
• The Lachman test — similar, but done with the knee only slightly bent, and often more accurate
• The pivot shift test — the knee is gently turned to check for looseness
• Examining your other knee for comparison
• An X-ray to check for broken bones
• An MRI scan to see the ligaments, the meniscus (the shock-absorbing pad) and the cartilage in detail
• Occasionally an examination under anaesthetic or a small camera inside the knee (arthroscopy)

What to expect at your appointment

You will lie on your back on an examination couch with your knee bent to about a right angle and your foot flat and relaxed. Your doctor will steady your thigh, hold your shin just below the knee and gently pull it towards them, then repeat this on the other side. It lasts only a few seconds. It may feel odd or a little sore, but it should not be sharply painful. Try to let the leg go heavy and relaxed, because tensing up can hide the result. You are welcome to ask your doctor to explain what they are feeling as they go.

Treatment

What happens next depends on what the test shows and how unstable your knee feels. Many people do well with physiotherapy and a gradual return to activity. Others — especially people who want to keep playing pivoting sports, or whose knee keeps giving way — may be offered surgery. Your doctor will talk through the choices with you so you can decide together.

Self-care at home

• Rest the knee and avoid the activity that caused the injury for a few days
• Use ice packs wrapped in a cloth for short periods to ease swelling
• Raise the leg on cushions when sitting or lying down
• Follow the physiotherapy exercises you are given, even on days you feel better
• Build activity up slowly instead of going straight back to sport
• Wear supportive shoes and avoid uneven ground while you recover

Medical treatments

Non-surgical treatment usually means physiotherapy to strengthen the muscles around the knee — especially the thigh muscles — plus balance and landing practice. Your care team may suggest a knee brace or support for a while, and crutches if walking is painful. For pain, ask your pharmacist or doctor which over-the-counter option is safe for you. If your knee stays unstable, or you want to return to pivoting sport, your doctor may refer you to an orthopaedic specialist to talk about surgery, which usually involves rebuilding the ligament using tissue from elsewhere in your knee or body.

When is surgery considered?

Surgery is not needed for every torn ACL. It may be discussed if your knee keeps giving way during everyday activities, if you play sport that involves pivoting or contact, or if other parts of the knee were damaged at the same time. Some people choose to manage without surgery, and both paths can be reasonable — your care team will help you weigh them up. Recovery after surgery takes several months of physiotherapy, so it is a big decision.

Living with this condition

In the first weeks you may need to slow down, use a support or crutches, and avoid twisting movements. Everyday things like stairs, getting in and out of a car, or carrying shopping can take more planning. Build your strength back step by step, and keep a note of what you can do each week so you can see your progress. Ask for help with heavy lifting and uneven ground while you heal.

Lifestyle tips

• Keep up strengthening and balance exercises — they are the best protection for your knee
• Warm up properly and include jumping and landing practice before sport
• Choose supportive footwear for your activity
• Build activity gradually, increasing by small steps each week
• Avoid playing through pain or tiredness

Diet and exercise

There is no special diet for a knee ligament injury, but eating well and staying at a healthy weight take strain off your knees. Regular movement that you build up slowly — walking, swimming, cycling and the strengthening exercises from your physiotherapist — helps keep the muscles around the knee strong. Aim to move most days and do strength work a few times a week, with rest days in between.

Mental health and emotional wellbeing

Knee injuries can shake your confidence, especially if sport is a big part of your life. It is normal to feel frustrated, anxious about re-injury or low while you are sidelined. Talk to your doctor or physiotherapist if these feelings build up. If you ever feel you cannot cope, contact your local mental health crisis service or your local emergency number straight away — support is available.

Prevention

Not every knee injury can be prevented, but the risk can be lowered. Injury prevention programmes that combine strength, balance and landing practice have been shown to reduce ACL injuries, particularly in sports teams. Warming up well, using good technique and not playing through tiredness all help too.

Screening programmes

There is no routine screening test for ACL injury in the general population. Some sports teams check movement, strength and landing technique at the start of a season to spot people who may benefit most from prevention training.

Complications

If left untreated

• The knee may keep giving way, which can lead to falls
• Repeated instability can damage the meniscus (the shock-absorbing pad) and the cartilage lining the knee
• That damage raises the chance of osteoarthritis (wear and tear of the joint) later in life
• Going back to sport too early raises the risk of re-injury
• Ongoing pain and instability can affect work, exercise and confidence

Long-term outlook

Most people with a knee ligament injury get back to the activities they enjoy. Some do well with physiotherapy alone; others have surgery and go through a few months of rehabilitation. Recovery takes time and patience, and setbacks can happen, but with the right support the outlook is good. Your care team can help you set realistic goals along the way.

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