Quadriceps Muscle Contusion
- 1 Search Strategies
- 2 Definition/Description
- 3 Clinical Relevant Anatomy
- 4 Epidemiology/Etiology
- 5 Risk factors
- 6 Clinical Presentation
- 7 Pathophysiology
- 8 Classification
- 9 Diagnostic Procedures
- 10 Outcome Measures
- 11 Imaging
- 12 Medical Management
- 13 Physical Therapy Management
- 14 Return to sports criteria
- 15 Clinical Bottom Line
- 16 References
We started our research by using electronic databases from Pubmed, Web Of Knowledge, VUB- library. As search topics we used “quadriceps muscle contusion” or relevant synonyms. To find more specific information we used targeted terms like “examination muscle contusion”, “healing process quadriceps contusion”. To expand our research for each subdivision we used synonyms of the related subject.
Charley horse/cork thigh/dead leg.
A quadriceps contusion is a traumatic blow, a deep bruise to the anterior lateral or medial aspect of the thigh. If examination confirms an area of swelling and tenderness with (terrible) pain on passive stretch and active contraction, the diagnosis is a Quadriceps contusion with resultant hematoma.  
The contusion is the result of an external force that can damage the muscle but can’t eliminate its function completely. Quadriceps contusions can lead to two serious complications: Compartment Syndrome and myositis ossificans. 
A contusion is the most common acute thigh injury in contact sport such as football, rugby and basketball. Contusions are caused by external forces like a direct blow from an opponent's knee. Thus, muscle contusions are classified as acute direct muscle injuries .The most frequently injured muscles are the exposed rectus femoris and the intermediate vastus, lying next to the bone, with limited space for movement when exposed to a direct blunt blow.  Localized bleeding may increase tissue pressure and tissue damage. The bleeding can be intramuscular or intermuscular. The intramuscular hematoma is more painful and restrictive of range of motion than the intermuscular hematoma.   
Clinical Relevant Anatomy
The Quadriceps femoris is a hip flexor and a knee extensor. It’s located in the anterior compartment of the thigh. This muscle is composed of 4 subcomponents:
Quadriceps contusions are mainly common by contact sports like rugby, football, basket, kick boxing . A systematic review resulted in a frequency from 10% to 40% of all football injuries were categorized as contusion, strains or sprains. The injury is caused by a sudden force to the quadriceps muscle causing significant muscle damage. This force is usual due to another player (in sports), a sport attribute or a misplaced fall on a severe object.
- Contact sports and sports that require quick starts, i.e. running races and other track events.
- Warm up and cool down habits.
- Off season/preseason/season training habits.
- Poor muscle conditioning.
- Playing position.
- Level of competition.
- Protective equipment use.
- Playing experience.
- Injury history, especially to the thigh, hip and/or knee.
- Medical history of any bleeding disorder.
- Poor nutrition.
- Smoking history.
A massive blunt force mostly to the anterior or lateral thigh causes rupture to the muscle fibers. In the beginning there are negligible symptoms, but after 24 hours this will lead to hematoma formation within the muscle causing: pain, swelling, stifness and impairment of functional quadriceps excursion. 
The injury consists of a well-defined sequence of events involving microscopic rupture and damage to muscle cells, macroscopic defects in muscle bellies, infiltrative bleeding, and inflammation. The repair of the tissue can be thought of as a race between remodeling and scar formation.
Several physiological responses may occur after a deep thigh contusion including:
• Broken blood vessels resulting in bleeding (hematoma) into the injured area
• Crushed muscle tissue resulting in hip and knee dysfunction
If there is major untreated and/or unresolved bleeding deep in the muscle tissue, a serious condition known as myositis ossificans can occur.
Contusion injury can lead to either diffuse or circumscribed bleeding that displaces or compresses muscle fibres causing pain and loss of motion. It happens that muscle fibres are torn off by the impact, but typically muscle fibres are not torn by longitudinal distraction. Therefore, contusions are not necessarily accompanied by a structural damage of muscle tissue. For this reason athletes, even with more severe contusions, can often continue playing for a long time, whereas even a smaller indirect structural injury forces the player often to stop at once.
Next to muscle strains is traumatic muscle contusions the most frequent type of quadriceps injury in sports. A direct external forceful blow to the quadriceps causing significant muscle damage is the usual mechanism of this injury. In comparison to strains, contusions will cause rupture to the muscle fibers at or directly adjacent to the area of impact. This typically leads to hematoma formation within the muscle causing pain and loss of motion. The extent of pain and loss of movement will be dependent on the amount of fore and the impact of the force at the time of trauma.   Quadriceps contusions are graded mild, moderate or severe between 12 and 24 hours. A mild contusion has more than 90 degrees of knee flexion; moderate between 45 and 90 degrees of knee flexion and severe less than 45 grades of knee flexion. 
There are three grades in contusions: 
|Pain||Active knee flexion||Gait||Description||Average loss of activity|
|Moderate||45 - 90 degree||Antalgic||
|Severe||< 45 degree||Severely antalgic||
||> 60 days|
The diagnosis is made by questioning an accurate history from the patient and completing a physical examination.
- Palpation along the injured muscle: to localize the pain and exact site of muscle damage and also to determine if there is any associated injury. The palpation test involved systematic digital probing from the lateral border of the vastus lateralis to the medial side of the thigh with the patient in long sitting, after which the physiotherapist subjectively noted, then recorded, the muscles injured and the area of injury (distal third, middle third or proximal third of the thigh).
- Muscle firmness testing was performed with fingertip palpation, with the muscle firmness at the site of the injury compared with the firmness of the same site on the uninjured leg, and rated on an 11-point scale from -5 (comparatively decreased muscle firmness) to +5 (comparatively increased muscle firmness). A zero rating was applied if the muscle firmness of the injury site was similar to the muscle firmness of the non-injured thigh
- Circumference measures were taken at the suprapatellar border, and at 10 and 20 centimetres proximal to this site on both thighs, using a purpose-made device which was designed to ensure that the distances above the suprapatellar border were constant for all subjects. The bottom of the Velcro strap was positioned in line with the suprapatellar border and the tape measures applied such that they were just in contact with the skin surface of the thigh.Measurements were recorded to the nearest millimetre
- Passive knee range of motion testing was performed with the subject in prone, with the hip in neutral, and the foot and distal third of the shank over the edge of the plinth to enable positioning of the Baseline digital inclinometer Prior to performing a joint angle measure, the tester passively flexed both knees three times until the available end of range was reached as determined by the first onset of pain on the injured leg, and restriction on the non-injured leg.This was done as a control for any preconditioning effect. The inclinometer was set to zero on the horizontal surface of the plinth, and placed on the distal end of the tibia to measure joint angle as the tester flexed the knee Subsequently, the difference in flexion range between knees and the relative percentage of knee range retained were determined.
- The brush-swipe and tap tests were performed with the patient in long sitting. In the first of these, the examiner was required to stroke the medial side of the patella, proximally towards the hip joint, two or three times followed by a stroke down the lateral side of the patella. A positive test was registered when a visible wave of fluid was evident on the medial side of the knee joint and below the patella border .The tap test was performed by applying a slight tap or pressure over the patella. A positive test was present when a large amount of intracapsular swelling produced a floating patella so that, on tapping, a downward movement of the patella could be felt by the tester.
- Strength testing of the quadriceps: that contains resisting knee extension and hip flexion, compared to the uninjured side. This will help in assessing severity of injury.
- Measurement of knee flexion is used as a prognostic indicator in quadriceps contusions. Based on this, thigh contusions can be graded into 3 groups that are based on the severity of injury:
The ‘Lower Extremity Functional Scale’ is used to evaluate the functionality for a wide range of lower limb conditions to know whether the person is having any difficulty with certain activities.
The best techniques for measuring the soft tissue damage and for complications caused by the initial injury are magnetic resonance imaging (MRI) and diagnostic ultrasound. Both have been highly sensitive to oedema and haemorrhage. These methods are expensive but can speed up the healing process by detecting the severity quick.  Ultrasound can be used to identify a localized hematoma formation caused from a contusion and provide real-time imaging for needle aspiration. If there is concern for bony involvement, radiographs will evaluate for bony injury. Subsequently, radiographs are useful in identifying heterotopic bone formation, known as myositis ossificans (MO), which is a delayed complication of severe muscle contusions.
Magnetic resonance imaging
MRI provides excellent lesion detection and localisation. The images are anatomical and clearly understood by healthcare professionals and patients alike. Depending on the magnet used, even the largest of athletes can be imaged without difficulty. However, MRI is a scarce resource, expensive, time-consuming, uncomfortable and acquires static images.
A 32-year-old male professional footballer with a deep surface thigh haematoma. (a) Coronal and (b) axial short tau inversion–recovery MRI of the anterior thigh demonstrating a large haematoma deep to the vastus intermedius muscle (arrowheads) adjacent to the femoral cortex (F). Note the laceration into the muscle (arrow) and the layering of blood products on the axial image (curved arrow). The player was imaged 2 weeks after the original injury and had completed two full games in the interval between the injury and the MRI scan.
MRI appearances of evolving muscle haematoma
|Stage||Blood product||T1 Signal intensity||T2 Signal intensity|
|Hyperacute (<4 h)||Intracellular oxyhaemoglobin||Intermediate||Bright|
|Acute (4 - 6 h)||Extracellular oxyhaemoglobin||Intermediate||Dark|
|Early subactute (6-72 h)||Intracellular methaemoglobin||Bright||Dark|
|Late subacute ( 72h - 4 weeks)||Extracellular methaemoglobin||Bright||Bright|
|Chronic ( >4 weeks)||Haemosiderin||Dark||Dark|
On ultrasound, a contusion is seen as an ill-defined area of hyperechogenicity within the muscle that crosses fascial boundaries . In the hyperacute situation, the injured muscle initially appears swollen and may be isoechoic with adjacent unaffected muscle.In the first 24–48 h, the haematoma will appear as an irregularly outlined muscle laceration separated by hypoechoic fluid with marked increased reflectivity in the surrounding muscle . During this period, the haematoma may solidify and become hyperechoic to the surrounding muscle. After 48–72 h, the haematoma develops into a clearly defined hypoechoic fluid collection with an echogenic margin. This echogenic margin gradually enlarges and “fills in” the haematoma in a centripetal fashion. If the haematoma is causing intense pain and/or exerts local mass effect on adjacent neurovascular structures, or is placing the limb at risk of compartment syndrome, then evacuation of the clot may be necessary. This is usually performed under ultrasound guidance 10–14 days after the initial injury ,
A 26-year-old male professional footballer with thigh haematoma. (a) Axial sonogram of the anterolateral thigh 2 days following a direct blow to the lateral side. Note the echogenic torn muscle tissue (arrow). (b) Axial sonogram taken 2 weeks later showing filling in of the haematoma.
NSAIDs can be useful short term for decreasing pain, but their long-term effect on muscle healing is not known . Long-term use of NSAIDs for contusions is usually not necessary and is discouraged. However, NSAIDs have been promoted for prevention of myositis ossificans after severe quadriceps contusions. Evidence for this use is inferred from studies showing a decrease in heterotopic bone formation after total hip replacement in those patients given indomethacin for at least 7 days. Similar to quadriceps muscle strains, corticosteroids are not recommended in the treatment of contusion injuries.
After three to four weeks, if the patient still moves with pain and isn’t able to perform a painless, full range of motion, radiographic imaging should be performed. This is to detect whether myositis ossificans is present. Myositis ossificans results in lasting pain and limited knee flexion. Surgical excision is then recommended. An MRI should also be considered to check for the presence of intramuscular hematoma or seroma. An MRI can also determine osteomyelitis of the femur. In that case, the solution is a resection of the infected bone and antibiotics.  
Physical Therapy Management
- For patients with a quadriceps muscle contusion, there are several treatments from which a physical therapist can choose. The first option is cryokinetics. It is a revalidation technique that consists out of ice application followed by progressive, active exercises. Once the affected thigh is getting numbed, you can begin with passively stretch the leg. A second aspect of the treatment program can be soft tissue massage around the periphery of the contusion. This leads to a better fluid resolution. A third option is electrotherapy in order to reduce the pain. Very important is that the patient avoid activities that excessively load the quadriceps during the physical therapy.
- The principles of treatment for quadriceps contusions are essentially the same as for quadriceps strains, with one major exception.It is recommended the injured leg be placed in a position of flexion for the first 24 h post-injury to limit hematoma formation. Practically, this can be done by placing the patient in a hinged knee brace at 120° of knee flexion or using elastic compression wrap to maintain this position of flexion. This needs to be done as soon as possible after injury.
- The main goals of therapy with patient with a quadriceps muscle contusion are relieving the pain and improving the ROM. The treatment is mostly non-operative and exists out of three phases:
- Rest, ice, compression.Compression is important in order to limit the hemorrhage for the first 24 to 48 hours.If the patient rests with his knee flexed, it helps to avoid muscle stiffness.
- Active and passive quadriceps muscle stretching with emphasis on knee flexion.After 24 h, the brace or wrap should be removed and gentle, active, pain-free range of motion at the knee should be instituted along with stretching and isometric quadriceps strengthening. The active phase of treatment, including functional rehabilitation, can begin when pain-free, active knee flexion of at least 120° is attained.
- Improve the functionality and a return to sport when full motion and strength are achieved.
Return to sports criteria
Criteria are similar to muscle strains for return to sports in contusions of the quadriceps. The athlete should be pain free, attain 120° of knee flexion with hip extended, and perform all aspects of functional field testing without limitations . Protective thigh padding is recommended prior to resuming sports in order to reduce recurrence.
Clinical Bottom Line
Contusions are one of the most common muscle injuries besides muscle-strains. They can sometimes evolve to a more complicated injury such as myositis ossificans or compartment syndrome, to which you have to pay attention. The options for treatment are mostly physiotherapy and in some serious complications an operation will be needed. Physiotherapy is designed to reduce the pain and improve the ROM of the patients, by giving cryokinetics, soft tissue massage and electrotherapy.
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