Sports-medicine knee pathway · London
ACL testing, the clinical and MRI pathway to diagnosing anterior cruciate ligament injury.
A structured combination of clinical tests (Lachman, anterior drawer, pivot shift) plus knee MRI to confirm anterior cruciate ligament (ACL) rupture. Modern private pathway offers same-week specialist assessment and imaging.
Why patients choose us
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The right hands
We route you to a consultant sports-medicine physician or knee surgeon — the person examining your knee is the person who decides the next step.
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Same-week answer
Clinical examination, MRI and consultant report typically completed inside a week.
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Independent, and free
We are paid by no clinic, so the recommendation is impartial and costs you nothing.
Key facts
The six things worth knowing about ACL testing.
What the pathway is, what it can — and cannot — settle, and the tests that anchor it.
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Definition
A structured clinical and MRI assessment for suspected anterior cruciate ligament injury.
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Most sensitive clinical test
The Lachman test is the most sensitive bedside test for ACL rupture.
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Imaging gold-standard
Knee MRI is the imaging gold-standard for confirming an ACL injury.
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Same-week private pathway
Sports-medicine consultation, MRI and written report can be completed in one week.
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Complete vs partial
The pathway distinguishes complete ACL rupture from a partial tear — the plan changes accordingly.
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Associated injuries
Identifies associated meniscal, chondral, bone-bruise and posterolateral corner injuries.
The diagnostic pathway
From history to imaging — what happens, in order.
One clinician from first message to plan — typically inside a week.
- 01
Detailed mechanism and history
Twisting, pivoting or deceleration injury; a "pop"; immediate swelling; a sensation of instability since the injury.
- 02
Lachman test
The most sensitive bedside test for ACL rupture (sensitivity 85–95%).
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Anterior drawer test
A supplementary test — less sensitive acutely but part of a complete knee examination.
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Pivot shift test
Highly specific for rotational instability; often requires examination under anaesthesia to be reliable.
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KT-1000 arthrometer
Instrumented laxity measurement — used in specialist sports-medicine and research settings.
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Knee MRI (1.5T or 3T)
Confirms ACL rupture, grades the tear, and characterises meniscal, chondral and bone-bruise injuries.
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Sports-medicine or knee-surgeon consultation
Interpreting the examination and MRI together — and turning them into a plan.
Typical end-to-end: 5–7 days. Urgent cases: same week.
What it shows
What ACL testing can — and cannot — settle.
The combined clinical and MRI pathway answers whether the ACL is torn, and identifies the injuries that travel with it.
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Complete ACL rupture
A full-thickness tear of the anterior cruciate ligament.
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Partial ACL tear
A partial-thickness tear — management differs from a complete rupture.
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Bone bruising (kissing lesion)
The characteristic lateral femoral condyle and posterolateral tibial plateau bruise pattern.
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Meniscal tear
Medial or lateral meniscal injury identified on the same MRI.
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Chondral injury
Articular cartilage damage in the tibio-femoral or patello-femoral compartments.
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Posterolateral corner injury
Ligamentous injury at the posterolateral corner — easy to miss, important to find.
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Segond fracture
A small avulsion fracture of the lateral tibial plateau — highly associated with ACL rupture.
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Red flag: locked knee with rotational injury — displaced meniscal tear or osteochondral fragment, urgent surgical review
A truly locked knee after a twisting injury needs urgent orthopaedic assessment, not a routine outpatient slot.
Next steps
Treatment options after a confirmed ACL injury.
The plan is a conversation between rehab, imaging findings and the sports you want to return to — not a default operation.
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Physiotherapy (prehab)
Restoring range of movement, quadriceps activation and swelling control before any decision on surgery.
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Bracing during rehab
A functional knee brace during return-to-activity phases where indicated.
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Sports-medicine consultation
A consultant sports-medicine physician to coordinate diagnosis, imaging and rehab.
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ACL reconstruction options
Discussion of graft choice — hamstring, patella tendon (BTB) or quadriceps tendon.
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Address concurrent meniscal injury
Meniscal repair where possible, or partial meniscectomy where repair is not feasible.
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Non-operative pathway
A structured rehab-only pathway for selected patients — sedentary, older, or low-demand.
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Return-to-sport testing (9–12 months)
Objective strength, hop and movement-quality testing before clearance to pivot sport.
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Partial ACL repair (specific cases)
Considered in selected proximal tears — a specialist decision, not a routine option.
Red flags
When ACL testing isn’t the right first step.
Some presentations need urgent surgical review rather than an outpatient pathway. These are the ones we look for first.
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Locked knee — bucket-handle meniscal tear
A true mechanical block to extension needs urgent orthopaedic review, not a routine slot.
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Combined ACL + PCL + MCL / LCL injury
A multi-ligament injury raises the possibility of a knee dislocation — a surgical emergency.
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Neurovascular injury (dislocation)
Any suspicion of knee dislocation warrants immediate emergency-department assessment for popliteal artery injury.
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Segond fracture on X-ray
A Segond fracture is highly associated with ACL rupture — MRI is mandatory.
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Failed ACL reconstruction
Persistent instability, re-injury or graft failure needs specialist revision assessment.
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Post-op infection
Increasing pain, swelling, redness or fever after ACL surgery is an urgent surgical review.
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Post-op arthrofibrosis
Loss of extension after ACL surgery is a treatable but time-critical complication.
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Chronic instability with cartilage damage
Repeated giving-way episodes cause meniscal and cartilage damage over time.
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Recurrent injury after return-to-sport
Re-injury after clearance suggests incomplete rehab or the wrong return-to-sport criteria.
Reading your report
A knee MRI report can look intimidating. It isn’t.
Whatever the finding, the report keeps to the same four parts.
A quiet reminder
The report is written for your doctor, not for you — and that’s normal.
If you would like us to talk you through it before your follow-up, just ask.
- 01 Header
Indication and mechanism
Your details, the reason for imaging, and the mechanism of injury that shapes interpretation.
- 02 Technique
MRI sequences and field strength
Which sequences were acquired, on a 1.5T or 3T scanner, and any limitations noted by the reporting radiologist.
- 03 Findings
ACL, menisci, cartilage, bone
Ligament-by-ligament and compartment-by-compartment description of the ACL, PCL, collaterals, menisci, cartilage and bone.
- 04 Impression
The conclusion: read this first
Complete or partial ACL tear, associated meniscal or chondral injuries, and the concrete next step — read this first.
Sources
The guidance that anchors this page.
Reviewed on 2026-07-30. Next scheduled review 2027-07-30.
Recognised by major UK insurers
Cover depends on your policy and clinic; we confirm with your insurer before booking.
Frequently asked
Everything we get asked about ACL testing.
Quick answers on Lachman vs pivot shift, when MRI is needed, complete vs partial tears, surgery and recovery.
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What is the most accurate clinical test for an ACL injury?
The Lachman test is the most sensitive bedside test for an ACL rupture, with a sensitivity of roughly 85–95% in experienced hands. The pivot shift test is the most specific but is often unreliable in an awake, guarded patient and is most accurate under anaesthesia.
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Do I need an MRI to diagnose an ACL rupture?
A confident clinical diagnosis is possible from history and a positive Lachman test alone, but MRI is the imaging gold-standard. It confirms the tear, distinguishes complete from partial injury, and — crucially — identifies associated meniscal, chondral and bone-bruise injuries that change the plan.
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How soon after injury should I be scanned?
A knee MRI can be performed at any time after the injury; there is no need to wait. Early imaging shortens the time to a definitive plan and helps rehab start with the right expectations.
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What is the difference between a complete and a partial ACL tear?
A complete rupture is a full-thickness tear with loss of ligament continuity; a partial tear preserves some fibres. The distinction matters because a subset of partial tears do well with structured rehab alone, whereas a functionally unstable complete tear in an active patient usually leads to reconstruction.
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Do I have to have surgery for an ACL rupture?
No. The decision depends on your activity demands, the sports you want to return to, any concurrent meniscal or chondral injury and how your knee behaves after prehab. Selected patients — often older, sedentary or low-demand — do very well with a non-operative rehab pathway.
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How long is the recovery from ACL reconstruction?
Most patients return to running around 3–6 months and to pivoting sport around 9–12 months, subject to passing objective return-to-sport testing. Rehab, not the operation, is the main determinant of outcome.
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In practice, in London
The honest picture around ACL testing in London
With acl testing, the London question is usually about report turnaround and the radiologist reading it — not whether the scan is available. The wait for ACL testing on the NHS depends heavily on where you live and how urgently the referral is graded. Central and West London private clinics can normally book within a week, with imaging or a procedure slot to follow shortly after. It’s worth being honest about the reason for going private: usually it’s time, not a fundamentally different test.
The mechanics are straightforward: a consultant appointment, any tests done at a nearby CQC-registered site, and a written report back within a few days. London’s density of private diagnostics — Marylebone, the City, Chelsea, Canary Wharf — means most patients can find something that fits around work without a cross-town trek. For acl testing specifically, the difference between a routine report and a sub-speciality read is where private care earns its keep.
We’re careful about what a private pathway for ACL testing can and can’t promise. It can compress a wait, put you in front of a subspecialist quickly, and get a proper report in your hands within a week. It can’t rewrite what the imaging or the bloods say. Setting that expectation up front tends to make the whole experience less stressful.
Nearby in the library