Knee Ligament Injuries

Name: Knee Ligament Injuries
Uploaded: 2017-07-06T17:09:03+00:00
Duration: PTM30S51
Channel: Sherman Sutton
Description: Knee Ligament Injuries

Knee Ligament Injuries

The ligaments around the knee are strong. However,
sometimes they can become injured. Ligaments injury Sprained Ruptured Majority tend to stretched and quickly settle down Partial Complete They may be sprained (stretched), or sometimes ruptured (torn). A ligament rupture can be partial (just some of the fibres that make up the ligament are torn) or complete (the ligament is torn through completely). The majority of knee ligament injuries are sprains and not tears and they tend to settle down quickly. Knee injuries by Lakeesha Perera

Knee injuries by Lakeesha Perera
There are a number of different things that can cause injury to the ligaments in your knee: You may have a direct blow to your knee or knock into something with your knee. Your knee may be moved outside of its usual range of movement. For example, this can happen during a fall, if you land awkwardly during sport, or after a sudden movement. You may have a direct blow to your knee or knock into something with your knee. Your knee may be moved outside of its usual range of movement. For example, this can happen during a fall, if you land awkwardly during sport, or after a sudden movement. Knee injuries by Lakeesha Perera

Sprains and partial tears Intact fibers splint the torn ones and so spontaneous healing will occur Adhesions may result, so active exercise is prescribed Aspirating the haemarthrosis and applying ice packs intermittently relieves pain Weight-bearing is allowed Knee is protected from rotation or angulation strains by a heavily padded bandage or a functional brace Knee injuries by Lakeesha Perera

Complete tears Isolated MCL or LCL treated as above Isolated tears of ACL may be treated by early operative reconstruction if the individual is a professional sportsman Cast-brace is worn until symptoms subside, thereafter movement and muscle-strengthening exercise. This is sufficient in about half of the patients as they regain good function and need no further treatment. Remainder will have varying instability, late assessment will identify those who will benefit from ligament reconstruction. Isolated tears of the PCL are usually treated conservatively Knee injuries by Lakeesha Perera

Combined injuries In ACL and collateral ligament injury treatment starts with joint bracing and physiotherapy to restore a good range of movements before ACL reconstruction Combined injuries involving the PCL the same approach is used however all damaged structures need to be repaired Knee injuries by Lakeesha Perera

Complications Adhesions If the knee with a partial ligament tear is not actively exercised, torn fibers will stick to intact fibers and bone. The knee gives way with catches of pain, localized tenderness and pain on lateral or medial rotation occur Confusion with a torn meniscus can be resolved by the grinding test or arthroscopy Instability The knee continues to give way and tends to get worse predisposing to osteoarthritis. Reconstruction before degeneration is wise. Knee injuries by Lakeesha Perera

Grading Ligament Injuries Knee injuries by Lakeesha Perera

Anterior cruciate ligament injury ACL injury most often occurs during sports such as football, basketball, skiing and tennis. The injury often happens if you land on your leg and then quickly pivot or twist your knee in the opposite direction. About half of people with an ACL injury also have injury to their meniscus or another ligament in the same knee. Woman > men Smaller size of ACL Smaller intercondylar notch Larger Q-angle (doubtful) normal = 17 degrees in women Normal = 14 degress in men Weaker hamstrings Ratio of 10 (quadriceps) to 7 (hamstrings) Hormones Estrogen – reduces collagen strength Relaxin Knee injuries by Lakeesha Perera

Types of ACL Tears Knee injuries by Lakeesha Perera

Physical Exam of the Knee
Inspection Palpation Range of Motion Special tests Neurovascular assessment Knee injuries by Lakeesha Perera

ACL: HISTORY Contact vs noncontact Immediate effusion (first 4-12 hr) Unable to continue Mechanism = pivot, hyperextension Knee injuries by Lakeesha Perera

ACL Special Tests Anterior drawer Lachman test Pivot shift test Valgus stress test at full extension! Knee injuries by Lakeesha Perera

ACL: PHYSICAL EXAM Decreased ROM Effusion-hemarthrosis, immediate + Instability tests Lachman: most accurate Pivot shift Anterior drawer + MCL and meniscus tests Knee injuries by Lakeesha Perera

“Partial” ACL tear > 40% ACL substance + Lachman, - pivot shift Clinically Most behave functionally as full tears Continued shifting ↑’s risk of meniscus damage Rx as full tear Knee injuries by Lakeesha Perera

ACL TREATMENT Grade 3- Nonsurgical modify activity splint & crutches, Closed chain WB to strengthen PRICES Hamstrings, gastroc! Functional bracing months Knee injuries by Lakeesha Perera

ACL TREATMENT Grade 3 Injuries- Surgery Indications Most active people will require surgery to restore adequate function and decrease instability Recurrent instability Inability to modify activity Associated injuries: meniscus Age Wait three weeks due to arthrofibrosis risk months Knee injuries by Lakeesha Perera

Posterior cruciate ligament injury Not as common as an ACL injury. Because the PCL is wider and stronger than the ACL. PCL sprains usually occur because the ligament was pulled or stretched too far, anterior force to the knee, or a simple misstep. PCL injuries disrupt knee joint stability because the tibia can sag posteriorly. Knee injuries by Lakeesha Perera

The ends of the femur and tibia rub directly against each other, causing wear and tear to the thin, smooth articular cartilage. This abrasion may lead to arthritis in the knee There are a number of ways that the PCL can become injured. For example, It may be injured during a car accident if the front of your bent knee hits the dashboard. Knee injuries by Lakeesha Perera

It may also be injured from falling on to your bent knee. Your PCL can also be injured if your knee is hit from the front whilst your leg is stretched out in front of you with your foot on the ground - for example, during a game of football. Knee injuries by Lakeesha Perera

At first, some people with a PCL injury may not have much in the way of symptoms . It may take a while for you to realize that there is a problem. For example, you may later notice pain that comes on when going up and down stairs or when starting a run; or, your knee may feel unstable when walking on uneven ground. Knee injuries by Lakeesha Perera

PCL INJURIES PHYSICAL EXAM + Effusion + Posterior drawer test + Posterior sag sign False positive Lachman test Common to have isolated injuries Knee injuries by Lakeesha Perera

PCL INJURIES TREATMENT PRICES Functional bracing (early) Rehab Surgery if continued instability, effusions Non-operative Aggressive rehab Focus quadriceps No support for bracing closed kinetic chain Open kinetic chain extension avoided 90% quads strength prior to normal athletics Knee injuries by Lakeesha Perera

Medial collateral ligament injury Injuries to the MCL can happen in almost any sport and can affect people of all age groups. They often happen when your leg is stretched out in front of you and the outer side of your knee is knocked at the same time - for example, during a rugby or football tackle. Knee injuries by Lakeesha Perera

MCL INJURIES PHYSICAL EXAM Tender to palpation along MCL
Pain + instability with valgus stress 30o flexion = MCL 90o flexion = associated ACL Pain with Apley’s distraction test COMPARE SIDES

MCL INJURIES Treatment Of Grade 1 &2 Early mobilization Weight-bearing as tolerated Hinged knee brace PRICES Recovery 4-6 weeks Knee injuries by Lakeesha Perera

MCL INJURIES Treatment of Grade 3 (full tears) Isolated = nonsurgical management Combined = surgery consistent with associated injuries Natural Hx = lack of long-term degenerative changes seen with ACL, meniscus Knee injuries by Lakeesha Perera

Lateral collateral ligament injury Injury to the LCL is less common than injury to the MCL. This is because your other leg usually protects against injury to the inner side of your knee. (It is usually a direct blow to the inner side of your knee that causes an LCL injury.) But, this ligament injury can sometimes happen if one leg is stretched out in front of you and doesn't have the other leg for protection - for example , during a rugby or football tackle. Knee injuries by Lakeesha Perera

What are the symptoms of a knee ligament injury? If you have injured one or more of the ligaments in your knee, the symptoms are likely to be similar regardless of the ligament that is injured. The severity of the symptoms depends on the degree of the injury to the ligament. For example, a ligament that is completely torn may produce more in the way of symptoms than a ligament that is just sprained (stretched). Knee injuries by Lakeesha Perera

Symptoms can include: 1.A popping sound, or a popping or snapping feeling 2. Swelling of your knee. Can hear at the time of injury if ligament completely torn Bleeding inside from the damaged ligament It leads to swelling The degree of swelling will depend on the severity of the injury. Minor ligament sprains may cause little in the way of swelling, whereas completely torn ligaments may lead to a lot of knee swelling. Completely torn ligament Minor ligament sprains Knee injuries by Lakeesha Perera

3. Pain in your knee. depend on the severity of the knee injury. 4.Tenderness around your knee on touching. This may be minor sprains ----mild tenderness over the actual ligament ligament torn -----more generalised and severe tenderness 5. Not being able to use or move your knee normally. complete ligament tears--- severely reduce minor sprains----relatively good Knee injuries by Lakeesha Perera

6. A feeling that your knee is unstable or perhaps giving way if you try to stand on it. This may cause you to limp. Again, this depends on how severe the ligament injury is. You may be able to stand if you only have a minor sprain. 7. Bruising around your knee can sometimes appear, although not always. It may take some time for bruising to develop. Knee injuries by Lakeesha Perera

Historical Clues to Knee Injury Diagnoses Noncontact injury with “pop” ACL tear Contact injury with “pop” MCL or LCL tear, meniscus tear, fracture Acute swelling ACL tear, PCL tear, fracture, knee dislocation, patellar dislocation Lateral blow to the knee MCL tear Medial blow to the knee LCL tear Knee “gave out” or “buckled” ACL tear, patellar dislocation Fall onto a flexed knee PCL tear Knee injuries by Lakeesha Perera

Special tests for ligaments Posterior Cruciate Anterior Cruciate Assess stability of 4 knee ligaments via applied stresses* Medial Collateral Lateral Collateral Knee injuries by Lakeesha Perera

The stabilizing roles of each ligament include: prevents the knee from buckling inwards (valgus injury) prevents the knee from buckling outwards (varus injury) prevents the tibia from sliding forward under the femur prevents the tibial from sliding backward under the femur MCL LCL ACL PCL Knee injuries by Lakeesha Perera

Stress Testing of Ligaments Use a standard exam routine Direct, gentle pressure No sudden forces Abnormal test Excessive motion = laxity Soft/mushy end point** Knee injuries by Lakeesha Perera

Normal Stability Normal test is no motion with varus and/or valgus stress with knee in neutral and 30 degrees of flexion Lachman’s test assesses Anterior Cruciate Ligament: Normal test is <5mm of forward movement of tibia on femur with knee at 30 degrees of flexion With knee in 90 degrees of flexion and foot stabilized, normal test will have <5mm of anterior motion (assessing ACL) or <5mm of posterior motion (assessing PCL) Medial and Lateral collateral ligaments Anterior and Posterior Cruciate Ligaments' control anterior/posterior motion Anterior and posterior drawer testing assesses ACL and PCL Knee injuries by Lakeesha Perera

Normal end point of ligament that examiner feels with applied stress is FIRM. A soft or mushy end point implies ligament damage (stretching or complete tear). Knee injuries by Lakeesha Perera

Collateral Ligament Assessment Patient and Examiner Position* Knee injuries by Lakeesha Perera

*Position patient supine on table with thigh resting on edge of exam table and foot supported by examiner Knee in 30 degrees of flexion – WHY? Increased laxity of medial side of knee in extension may indicate additional damage to posterior structures (posterior joint capsule & PCL) Knee injuries by Lakeesha Perera

Valgus Stress Test for MCL* Note Direction Of Forces Knee injuries by Lakeesha Perera

*VALGUS (MCL) stress Proximal hand on lateral aspect of knee holds and stabilizes thigh Distal hand directs ankle laterally Attempt to open knee joint on medial side Estimate the medial joint space and evaluate the stiffness of motion. Positive test = Significant gap in medial aspect of knee with valgus stress = MCL injury. Knee injuries by Lakeesha Perera

Varus Stress Test for LCL* Note direction of forces Knee injuries by Lakeesha Perera

*VARUS (LCL) Stress Supine position, with knee at 20 to 30 degrees of flexion and thigh supported. Stabilize medial aspect of knee and push ankle medially, trying to open knee joint on lateral side Disruption of LCL is indicated by difference in degree of lateral knee tautness with varus stress. Compare affected knee to uninjured side Knee injuries by Lakeesha Perera

Lachman Test* Patient Position Physician hand placement Knee injuries by Lakeesha Perera

*Lachman Maneuver more sensitive and specific for ligamentous tears than drawer sign. Patient is supine Knee flexed to degrees Hand placement: Grasp and stabilize patient’s thigh just proximal to patella With opposite hand, try to move proximal tibia forward on femur POSITIVE TEST = Excessive forward motion of tibia (>5mm) without firm endpoint indicates ACL damage Knee injuries by Lakeesha Perera

Modification for patient with large thighs: Thigh placed over knee of examiner Push downward on femur with hand while other hand grasps proximal tibia, attempting to move it anteriorly Knee injuries by Lakeesha Perera

Lachman Test View from lateral aspect* Note direction of forces Knee injuries by Lakeesha Perera

Anterior Drawer Test for ACL Physician Position & Movements* Patient Position Note direction of forces Knee injuries by Lakeesha Perera

*Patient Position Supine Flex hip of affected knee to 45 degrees Bend knee to 90 degrees Patient's foot planted firmly on examination table Physician position: Sitting on dorsum of foot, place both hands behind knee Once hamstrings relaxed, try to displace proximal leg anteriorly Anterior drawer test is LESS SENSITIVE for ACL damage than Lachman’s Maneuver Knee injuries by Lakeesha Perera

Posterior Drawer Testing- PCL* Note direction of forces Knee injuries by Lakeesha Perera

*Patient Position Supine Affected knee at 90 degrees of flexion Determine ‘neutral’ position by comparing resting position with unaffected knee Physician Position & Movements Patient's foot placed between examiner's legs while the palms of the hands are used to push the tibia posteriorly. Tester directs pressure backward upon proximal tibia, similar to Anterior Drawer Testing Interpretation of test: Posterior instability - PCL injury indicated by increased posterior tibial translation Confusion - trying to distinguish abnormal translation of tibia on femur - from excessive ACL or PCL laxity Knee injuries by Lakeesha Perera

Commonly injured part Meniscal Tears Occur during twisting motions with the knee flexed Signs tenderness possible clicking Can occur combine with other ligament – ACL mostly Symptoms Pain catching buckling Knee injuries by Lakeesha Perera

Older people can injure the meniscus without any trauma as the cartilage weakens and wears thin over time, setting the stage for a degenerative tear. Medial Menisci: more prone to injury because of its restricted anatomy due to attachment to the joint capsule and to the tibial collateral ligament make it less mobile. Knee injuries by Lakeesha Perera

Meniscus Tears Mechanism Pattern of tear traumatic bucket handle horizontal degenerative The split is vertical, along the circumference of the meniscus leaving anterior and posterior segments attached loosely. Sometimes the torn part displaces towards the center, causing “locking” (extension block). Usually degenerative in origin or due to repetitive minor trauma, or with association with meniscal cysts. Generally speaking, most of the meniscus is avascular, except the outer third-from capsule-, due to this spontaneous repair doesn’t occur. *The loose part act as a mechanical irritant causing recurrent synovial effusion, and in severe cases secondary osteoarthritis. Knee injuries by Lakeesha Perera

Menisci Tears Clinical Features: Patients may complain of pain at the joint line area, locking, clicking, giving way, and swelling with activity. In ptn >40yrs the main complaint is recurrent giving way or locking. Physical exam: Joint line tenderness (Mostly medial). Joint held slightly flexed. Joint effusion may be present. In late cases quadriceps are wasted. Flexion is full , extension limited. Knee injuries by Lakeesha Perera

Assess Meniscus – Knee Flexion Most sensitive test is full flexion* Examiner passively flexes the knee or has patient perform a full two-legged squat to test for meniscal injury Joint line tenderness** Flexion of the knee enhances palpation of the anterior half of each meniscus Knee injuries by Lakeesha Perera

Joint line tenderness: the most imp and specific test _ Apley’s grind test: • Isolates meniscii • Prone with knee flexed, axial load and rotation. - McMurray’s test • Flex/ext with varus / valgus and int/ext rotation. • Goal is to get torn piece to pop in and out of place. • Positive if pop or reproduction of pain. Knee injuries by Lakeesha Perera

Menisci Tears Imaging X-ray – Normal MRI – most useful may reveal tears missed by arthroscopy Arthroscopy : Diagnostic and therapeutic. You have to be certain that the lesion you can see is the one causing the patient’s symptoms. Knee injuries by Lakeesha Perera

Menisci Tears Treatment Conservative treatment of meniscal injuries begins with RICE (Rest, Ice, Compression, and Elevation). Arthroscopy is the preferred method. peripheral tears – surgery. The displaced portion should be excised. Postoperative physiotherapy. Surgical treatment of symptomatic meniscal tears is recommended because untreated tears may increase in size and may abrade articular cartilage, resulting in arthritis. Knee injuries by Lakeesha Perera

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Knee Ligament Injuries

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