释义 |
- Signs and symptoms
- Causes
- Diagnosis Examination Differential diagnosis Classification Runner's knee Chondromalacia patellae
- Treatment Exercises Joint mobilization Medication Medical imaging Rest Braces and taping Foot orthoses Electrophysical agents Surgery Alternative medicine
- Epidemiology
- See also
- References
- External links
{{about|pain in the patellofemoral region||Runner's knee}}{{Infobox medical condition (new) | name = Patellofemoral pain syndrome | synonyms = Patellar overload syndrome, runner's knee | image = PFPS.png | caption = Diagram of the bones of the lower extremity. Rough distribution of areas affected by PFPS highlighted in red: patella and distal femur. | pronounce = | field = Orthopedics, sports medicine | symptoms = | complications = | onset = | duration = | types = | causes = | risks = | diagnosis = | differential = | prevention = | treatment = | medication = | prognosis = | frequency = | deaths = }}Patellofemoral pain syndrome (PFPS), also known as runner's knee, is a condition characterized by knee pain ranging from mild to severe discomfort seemingly originating from the contact of the posterior surface of the patella (back of the kneecap) with the femur (thigh bone). It is "anterior knee pain involving the patella and retinaculum that excludes other intra-articular and peri-patellar pathology".[1]The population most at risk from PFPS are runners, cyclists, basketball players and other sports participants. Onset can be gradual or the result of a single incident and is often caused by a change in training regimen that includes dramatic increases in training time, distance or intensity, it can be compounded by wearing the wrong type of footwear.[1] Symptoms include discomfort while sitting with bent knees or descending stairs and generalised knee pain.[3] Treatment involves resting and physical therapy that includes stretching and strengthening exercises for the legs. {{TOC limit}}Signs and symptomsThe onset of the condition is usually gradual,[1] although some cases may appear suddenly following trauma.[1] - Knee pain - the most common symptom is diffuse peripatellar pain (vague pain around the kneecap) and localized retropatellar pain (pain focused behind the kneecap). Affected individuals typically have difficulty describing the location of the pain, and may place their hands over the anterior patella or describe a circle around the patella (the "circle sign").[1] Pain is usually initiated when load is put on the knee extensor mechanism, e.g. ascending or descending stairs or slopes, squatting, kneeling, cycling, running or prolonged sitting with flexed (bent) knees.[7][2][3] The latter feature is sometimes termed the "movie sign" or "theatre sign" because individuals might experience pain while sitting to watch a film or similar activity.[4] The pain is typically aching with occasional sharp pains and may present it self exacerbated.[1][5]
- Crepitus (joint noises)[4] may be present (but not have relation with pain and function)[6][7]
- Giving-way of the knee[4] may be reported
- Knee Flexion reduced - individuals with PFPS may show a knee flexion reduced during the activities.[8]
CausesIn most patients with PFPS an examination of their history will highlight a precipitating event that caused the injury. Changes in activity patterns such as excessive increases in running mileage, repetitions such as running up steps and the addition of strength exercises that affect the patellofemoral joint are commonly associated with symptom onset. Excessively worn or poorly fitted footwear may be a contributing factor. To prevent recurrence the causal behaviour should be identified and managed correctly.[1] The medical cause of PFPS is thought to be increased pressure on the patellofemoral joint.[4] There are several theorized mechanisms relating to how this increased pressure occurs: - Increased levels of physical activity[4]
- Malalignment of the patella as it moves through the femoral groove[4]
- Quadriceps muscle imbalance[4][9]
- Tight anatomical structures, e.g. retinaculum or iliotibial band.[4]
Causes can also be a result of excessive genu valgum and the above mentioned repetitive motions leading to abnormal lateral patellar tracking. Individuals with genu valgum have larger than normal Q-angles causing the weight-bearing line to fall lateral to the centre of the knee causing overstretching of the MCL and stressing the lateral meniscus and cartilages. The cause of pain and dysfunction often results from either abnormal forces (e.g. increased pull of the lateral quadriceps retinaculum with acute or chronic lateral PF subluxation/dislocation) or prolonged repetitive compressive or shearing forces (running or jumping) on the PF joint. The result is synovial irritation and inflammation and subchondral bony changes in the distal femur or patella known as "bone bruises". Secondary causes of PF Syndrome are fractures, internal knee derangement, osteoarthritis of the knee and bony tumors in or around the knee.[10] Diagnosis Examination Patients can be observed standing and walking to determine patellar alignment.[11] The Q-angle, lateral hypermobility, and J-sign are commonly used determined to determine patellar maltracking.[12] The patellofemoral glide, tilt, and grind tests (Clarke's sign), when performed, can provide strong evidence for PFPS.[1][13] Lastly, lateral instability can be assessed via the patellar apprehension test, which is deemed positive when there is pain or discomfort associated with lateral translation of the patella.[1][11] Various clinical tests have been investigated for diagnostic accuracy. The Active Instability Test, knee pain during stair climbing, Clarke's test, pain with prolonged sitting, patellar inferior pole tilt, and pain during squatting have demonstrated the best accuracy.[32] However, careful consideration is still needed when using these tests to make a differential diagnosis of PFPS.[14] Differential diagnosis {{main|Knee pain}}The diagnosis of patellofemoral pain syndrome is made by ruling out patellar tendinitis, prepatellar bursitis, plica syndrome, Sinding-Larsen and Johansson syndrome, and Osgood–Schlatter disease.[15] Currently, there is not a gold standard assessment to diagnose PFPS.[16] ClassificationRunner's kneePFPS is one of a handful of conditions sometimes referred to as runner's knee;[1] the other conditions being Chondromalacia patellae, Iliotibial band syndrome, and Plica syndrome. Chondromalacia patellaeChondromalacia patellae is a term sometimes treated synonymously with PFPS.[4] However, there is general consensus that PFPS applies only to individuals without cartilage damage,[4] thereby distinguishing it from chondromalacia patellae, a condition characterized by softening of the patellar articular cartilage.[1] Despite this academic distinction, the diagnosis of PFPS is typically made clinically, based only on the history and physical examination rather than on the results of any medical imaging. Therefore, it is unknown whether most persons with a diagnosis of PFPS have cartilage damage or not, making the difference between PFPS and chondromalacia theoretical rather than practical.[4] It is thought that only some individuals with anterior knee pain will have true chondromalacia patellae.[1]TreatmentAs patellofemoral pain syndrome is the most common cause of anterior knee pain in the outpatient,[17][18] a variety of treatments for patellofemoral pain syndrome are implemented.[19] Most patients with patellofemoral pain syndrome respond well to conservative therapy.[19][20] ExercisesThere is consistent but very low quality evidence that exercise therapy for PFPS reduces pain, improves function and aids long-term recovery.[47] However, there is insufficient evidence to compare the effectiveness of different types of exercises with each other, and exercises with other forms of treatment.[21] Exercise therapy is the recommended first line treatment of PFPS.[17] Various exercises have been studied and recommended.[22] Exercises are described according to 3 parameters:[2] - Type of muscle activity (concentric, eccentric or isometric)
- Type of joint movement (dynamic, isometric or static)
- Reaction forces (closed or open kinetic chain)
The majority of exercise programs intended to treat PFPS are designed to strengthen the quadriceps muscles.[2] Quadriceps strengthening is considered to be the "gold" standard treatment for PFPS.[19] Quadriceps strengthening is commonly suggested because the quadriceps muscles help to stabilize the patella. Quadriceps weakness and muscle imbalance may contribute to abnormal patellar tracking.[19] If the strength of the vastus medialis muscle is inadequate, the usually larger and stronger vastus lateralis muscle will pull sideways (laterally) on the kneecap. Strengthening the vastus medialis to prevent or counter the lateral force of the vastus lateralis is one way of relieving PFPS. However, there is growing evidence that support more proximal factors play a much larger role than vastus medialis (VMO) strength deficits or quadriceps imbalance.[23] Hip Abductor, Extensor, and External Rotator weakness (particularly gluteus Maximus and Medius) appear to be prevalent in PPS and strengthening in these areas has demonstrated significant symptom reduction in many patients with PPS as well as helped prevent future more serious injuries such as non contact ACL tears in athletes. . Emphasis during exercise may be placed on coordinated contraction of the medial and lateral parts of the quadriceps as well as of the hip adductor, hip abductor and gluteal muscles.[2] Many exercise programs include stretches designed to improve lower limb flexibility.[2] Electromyographic biofeedback allows visualization of specific muscle contractions and may help individuals performing the exercises to target the intended muscles during the exercise.[2] Electrostimulation may be used to apply external stimuli resulting in contraction of specific muscles and thus exercise.[4] Inflexibility has often been cited as a source of patellofemoral pain syndrome. Stretching of the laterial knee has been suggested to help.[24] Joint mobilization Knee and lumbar joint mobilization are not recommended as primary interventions for PFPS. It can be used as combination intervention, but as we continue to promote use of active and physical interventions for PFPS, passive interventions such as joint mobilizations are not recommended. [25] MedicationNon-steroidal anti-inflammatory drugs (NSAIDs) are widely used to treat PFPS, however there is only very limited evidence that they are effective.[4] NSAIDs may reduce pain in the short term, overall however, after three months pain is not improved.[63] There is no evidence that one type of NSAID is superior to another in PFPS, and therefore some authors have recommended that the NSAID with fewest side effects and which is cheapest should be used.[4]Glycosaminoglycan polysulfate (GAGPS) inhibits proteolytic enzymes and increases synthesis and degree of polymerization of hyaluronic acid in synovial fluid.[4] There is contradictory evidence that it is effective in PFPS.[4]Medical imagingMagnetic resonance imaging rarely can give useful information for managing patellofemoral pain syndrome and treatment should focus on an appropriate rehabilitation program including correcting strength and flexibility concerns.[26] In the uncommon cases where a patient has mechanical symptoms like a locked knee, knee effusion, or failure to improve following physical therapy, then an MRI may give more insight into diagnosis and treatment.[26] Rest Patellofemoral pain syndrome may also result from overuse or overload of the PF joint. For this reason, knee activity should be reduced until the pain is resolved.[27][28] Braces and taping There is no statistically or clinically significant difference in pain symptoms between taping and non-taping in individuals with PFPS.[29] Although taping alone is not shown to reduce pain, studies show that taping in conjunction with therapeutic exercise can have a significant effect on pain reduction.[30] Knee braces are ineffective in treating PFPS.[29] The technique of McConnell taping involves pulling the patella medially with tape (medial glide). Findings from some studies suggest that there is limited benefit with patella taping or bracing when compared to quadriceps exercises alone.[19] There is a lack of evidence to show that knee orthoses (knee brace, sleeve and strap) are effective for treatment.[32] Foot orthoses Low arches can cause overpronation or the feet to roll inward too much increasing load on the patellofemoral joint. Poor lower extremity biomechanics may cause stress on the knees and can be related to the development of patellofemoral pain syndrome, although the exact mechanism linking joint loading to the development of the condition is not clear. Foot orthoses can help to improve lower extremity biomechanics and may be used as a component of overall treatment.[33][34] Foot orthoses may be useful for reducing knee pain in the short term,[35] and may be combined with exercise programs or physical therapy. However, there is no evidence supporting use of combined exercise with foot orthoses as intervention beyond 12 months for adults. Evidence for long term use of foot orthoses for adolescents is uncertain. No evidence supports use of custom made foot orthoses.[25] Electrophysical agents The use of electrophysical agents and therapeutic modalities are not recommended as passive treatments should not be the focus of the plan of care.[36] SurgeryThe scientific consensus is that surgery should be avoided except in very severe cases in which conservative treatments fail.[4] The majority of individuals with PFPS receive nonsurgical treatment.[2] Alternative medicineThere is no evidence to support the use of acupuncture or low-level laser therapy to treat PFPS.[37] Most studies touting the benefits of alternative therapies for PFPS were conducted with flawed experimental design, and therefore did not produce reliable results.[38] EpidemiologySpecific populations at high risk of primary PFPS include runners, bicyclists, basketball players, young athletes and females.[39] BMI did not significantly increase risk of developing PFPS in adolescents. However, adults with PFPS have higher BMI than those without. It is suggested that higher BMI is associated with limited physical activity in people with PFPS as physical activity levels decrease as a result of pain associated with the condition. However, no longitudinal studies are able to show that BMI can be a predictor of development or progression of the condition.[40] See also - Plica syndrome
- Iliotibial band syndrome
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External links {{Medical resources | DiseasesDB = 33163 | ICD10 = {{ICD10|M|22|2|m|20}} | ICD9 = {{ICD9|719.46}} | ICDO = | OMIM = | MedlinePlus = | eMedicineSubj = article | eMedicineTopic = 308471 | MeshID = D046788 }}- {{dmoz|Health/Conditions_and_Diseases/Musculoskeletal_Disorders/Chondromalacia/}}
- {{eMedicine|article|90286|Patellofemoral Joint Syndromes Treatment & Management}}
{{Arthropathies and related conditions}}{{Acquired musculoskeletal deformities}} 4 : Overuse injuries|Arthropathies|Syndromes|Knee injuries and disorders |