Nonsurgical Management of Knee Pain in Adults

 

Am Fam Physician. 2015 Nov 15;92(10):875-883.

  Patient information: See related handout on knee pain, written by the authors of this article.

Author disclosure: No relevant financial affiliations.

The role of the family physician in managing knee pain is expanding as recent literature supports nonsurgical management for many patients. Effective treatment depends on the etiology of knee pain. Oral analgesics—most commonly nonsteroidal anti-inflammatory drugs and acetaminophen—are used initially in combination with physical therapy to manage the most typical causes of chronic knee pain. The American Academy of Orthopaedic Surgeons recommends against glucosamine/chondroitin supplementation for osteoarthritis. In patients who are not candidates for surgery, opioid analgesics should be used only if conservative pharmacotherapy is ineffective. Exercise-based therapy is the foundation for treating knee osteoarthritis and patellofemoral pain syndrome. Weight loss should be encouraged for all patients with osteoarthritis and a body mass index greater than 25 kg per m2. Aside from stabilizing traumatic knee ligament and tendon tears, the effectiveness of knee braces for chronic knee pain is uncertain, and the use of braces should not replace physical therapy. Foot orthoses can be helpful for anterior knee pain. Corticosteroid injections are effective for short-term pain relief in patients with osteoarthritis. The benefit of hyaluronic acid injections is controversial, and recommendations vary; recent systematic reviews do not support a clinically significant benefit. Small studies suggest that regenerative injections can improve pain and function in patients with chronic knee tendinopathies and osteoarthritis.

Knee pain affects approximately 25% of adults, limiting function, mobility, and quality of life.1 The prevalence of knee pain has increased 65% over the past 20 years,1 with an estimated 4 million primary care visits per year attributed to knee pain.2 Knee symptoms are the 10th most common reason for outpatient visits.3 Recent studies support nonsurgical management for common knee diseases, such as osteoarthritis and meniscal disease.46  Although there are many causes of and treatments for knee pain, this article focuses on the evidence supporting nonsurgical interventions for typical causes of knee pain in adults: osteoarthritis (Table 1722); patellofemoral pain syndrome (Table 212,2327); and meniscal, tendon, and ligament injuries (Table 32835).

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SORT: KEY RECOMMENDATIONS FOR PRACTICE

Clinical recommendationEvidence ratingReferences

Exercise-based therapy is the first-line treatment for knee osteoarthritis and patellofemoral pain syndrome, in addition to weight loss, if necessary, for those with osteoarthritis.

C

7, 23

Nonsteroidal anti-inflammatory drugs are effective for short-term treatment of knee osteoarthritis and patellofemoral pain syndrome.

B

7, 8, 25

Glucosamine/chondroitin supplementation has limited effectiveness in the treatment of osteoarthritis.

B

7, 15, 17, 48, 49

Active rehabilitation is as effective as arthroscopy at reducing pain and improving function in patients with nontraumatic degenerative medial meniscal tears without mechanical symptoms.

A

28, 29

Braces are a reasonable option for treatment of common knee overuse conditions, but should not replace treatments such as active rehabilitation.

C

21, 22, 26, 27, 33


A = consistent, good-quality patient-oriented evidence; B = inconsistent or limited-quality patient-oriented evidence; C = consensus, disease-oriented evidence, usual practice, expert opinion, or case series. For information about the SORT evidence rating system, go to http://www.aafp.org/afpsort.

SORT: KEY RECOMMENDATIONS FOR PRACTICE

Clinical recommendationEvidence ratingReferences

Exercise-based therapy is the first-line treatment for knee osteoarthritis and patellofemoral pain syndrome, in addition to weight loss, if necessary, for those with osteoarthritis.

C

7, 23

Nonsteroidal anti-inflammatory drugs are effective for short-term treatment of knee osteoarthritis and patellofemoral pain syndrome.

B

7, 8, 25

Glucosamine/chondroitin supplementation has limited effectiveness in the treatment of osteoarthritis.

B

7, 15, 17, 48, 49

Active rehabilitation is as effective as arthroscopy at reducing pain and improving function in patients with nontraumatic degenerative medial meniscal tears without mechanical symptoms.

A

28, 29

Braces are a reasonable option for treatment of common knee overuse conditions, but should not replace treatments such as active rehabilitation.

C

21, 22, 26, 27, 33


A = consistent, good-quality patient-oriented evidence; B = inconsistent or limited-quality patient-oriented evidence; C = consensus, disease-oriented evidence, usual practice, expert opinion, or case series. For information about the SORT evidence rating system, go to http://www.aafp.org/afpsort.

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BEST PRACTICES IN ORTHOPEDICS: RECOMMENDATIONS FROM THE CHOOSING WISELY CAMPAIGN

RecommendationSponsoring organization

Do not use glucosamine and chondroitin to treat patients with symptomatic osteoarthritis of the knee.

American Academy of Orthopaedic Surgeons

Do not use lateral wedge insoles to treat patients with symptomatic medial compartment osteoarthritis of the knee.

American Academy of Orthopaedic Surgeons


Source: For more information on the Choosing Wisely Campaign, see http://www.choosingwisely.org. For supporting citations and to search Choosing Wisely recommendations relevant to primary care, see http://www.aafp.org/afp/recommendations/search.htm.

BEST PRACTICES IN ORTHOPEDICS: RECOMMENDATIONS FROM THE CHOOSING WISELY CAMPAIGN

RecommendationSponsoring organization

Do not use glucosamine and chondroitin to treat patients with symptomatic osteoarthritis of the knee.

American Academy of Orthopaedic Surgeons

Do not use lateral wedge insoles to treat patients with symptomatic medial compartment osteoarthritis of the knee.

American Academy of Orthopaedic Surgeons


Source: For more information on the Choosing Wisely Campaign, see http://www.choosingwisely.org. For supporting citations and to search Choosing Wisely recommendations relevant to primary care, see http://www.aafp.org/afp/recommendations/search.htm.

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Table 1.

Treatments for Knee Osteoarthritis

TreatmentEvidence

Physical therapy and weight loss

Combination of aerobic and strength training is recommended, and weight loss if body mass index is greater than 25 kg per m2 7,8; home programs are as effective as supervised programs9

Ice improves range of motion and strength, but not pain10

There is some evidence for patellar taping or therapeutic ultrasonography to improve physical function and decrease pain11,12

Pharmacotherapy

Extended-release acetaminophen, 1,300 mg three times daily, is effective and well tolerated; however, other studies show inconclusive evidence of effectiveness13,14

Glucosamine/chondroitin supplements show mixed benefit and are not recommended by the American Academy of Orthopaedic Surgeons7,1518

Opioid analgesics should be used only if conservative pharmacotherapy is ineffective in patients who are not candidates for surgery8

Selective and nonselective nonsteroidal anti-inflammatory drugs are effective8

Injections

Corticosteroid injections provide short-term improvements in pain and function19

Hyaluronic injections have questionable benefit for pain and function, and are best reserved for patients in whom first-line conservative treatments have been ineffective and who are not candidates for surgery7,8,20

Braces, orthoses, and other therapies

Limited evidence for medial unloader valgus brace21,22


Information from references 7 through 22.

Table 1.

Treatments for Knee Osteoarthritis

TreatmentEvidence

Physical therapy and weight loss

Combination of aerobic and strength training is recommended, and weight loss if body mass index is greater than 25 kg per m2 7,8; home programs are as effective as supervised programs9

Ice improves range of motion and strength, but not pain10

There is some evidence for patellar taping or therapeutic ultrasonography to improve physical function and decrease pain11,12

Pharmacotherapy

Extended-release acetaminophen, 1,300 mg three times daily, is effective and well tolerated; however, other studies show inconclusive evidence of effectiveness13,14

Glucosamine/chondroitin supplements show mixed benefit and are not recommended by the American Academy of Orthopaedic Surgeons7,1518

Opioid analgesics should be used only if conservative pharmacotherapy is ineffective in patients who are not candidates for surgery8

Selective and nonselective nonsteroidal anti-inflammatory drugs are effective8

Injections

Corticosteroid injections provide short-term improvements in pain and function19

Hyaluronic injections have questionable benefit for pain and function, and are best reserved for patients in whom first-line conservative treatments have been ineffective and who are not candidates for surgery7,8,20

Braces, orthoses, and other therapies

Limited evidence for medial unloader valgus brace21,22


Information from references 7 through 22.

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Table 2.

Treatments for Patellofemoral Pain Syndrome

TreatmentEvidence

Physical therapy

Quadriceps and hip strengthening combined with stretching of quadriceps, hamstrings, hip flexors, and iliotibial band three times weekly for six to eight weeks is effective in reducing pain and improving functionality23

Ultrasonography and patellar taping have conflicting results but may be helpful adjuncts12,24

Pharmacotherapy

Nonsteroidal anti-inflammatory drugs are effective for short-term treatment25

Braces and orthoses

There is limited evidence for lateral patellar buttress brace26,27


Information from references 12, and 23 through 27.

Table 2.

Treatments for Patellofemoral Pain Syndrome

TreatmentEvidence

Physical therapy

Quadriceps and hip strengthening combined with stretching of quadriceps, hamstrings, hip flexors, and iliotibial band three times weekly for six to eight weeks is effective in reducing pain and improving functionality23

Ultrasonography and patellar taping have conflicting results but may be helpful adjuncts12,24

Pharmacotherapy

Nonsteroidal anti-inflammatory drugs are effective for short-term treatment25

Braces and orthoses

There is limited evidence for lateral patellar buttress brace26,27


Information from references 12, and 23 through 27.

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Table 3.

Treatments for Meniscal, Tendon, and Ligament Pathology

TreatmentEvidence

Physical therapy

Active rehabilitation is as effective as arthroscopy for improving pain and function in patients with nontraumatic medial meniscal tears,28 and is as good as meniscectomy for improving physical function in patients with meniscal tears and osteoarthritis29

Eccentric training is beneficial, but specific protocols are lacking30

Pharmacotherapy

Nonsteroidal anti-inflammatory drugs decrease ligamentous pain, but may have adverse effects on tendon healing31

Injections

Corticosteroid injections provide short-term benefit for iliotibial band syndrome32

Braces, orthoses, and other therapies

There is limited evidence for infrapatellar strap33

Immobilizer braces for acute major ligamentous tears for support and stabilization may decrease pain in the acute phase34,35


Information from references 28 through 35.

Table 3.

Treatments for Meniscal, Tendon, and Ligament Pathology

TreatmentEvidence

Physical therapy

Active rehabilitation is as effective as arthroscopy for improving pain and function in patients with nontraumatic medial meniscal tears,28 and is as good as meniscectomy for improving physical function in patients with meniscal tears and osteoarthritis29

Eccentric training is beneficial, but specific protocols are lacking30

Pharmacotherapy

Nonsteroidal anti-inflammatory drugs decrease ligamentous pain, but may have adverse effects on tendon healing31

Injections

Corticosteroid injections provide short-term benefit for iliotibial band syndrome32

Braces, orthoses, and other therapies

There is limited evidence for infrapatellar strap33

Immobilizer braces for acute major ligamentous tears for support and stabilization may decrease pain in the acute phase34,35


Information from references 28 through 35.

Osteoarthritis

PHYSICAL THERAPY AND WEIGHT LOSS

Physical therapy and exercise are the foundation of nonsurgical management of osteoarthritis-associated knee pain (Figure 1). Evidence has shown that active management (e.g., stretching, strengthening, exercise programs) is more effective in decreasing knee pain and improving function than passive modalities (e.g., therapeutic ultrasonography, electrical stimulation, taping, cryotherapy, heat).36 Patellar taping is a popular adjunct treatment that has been shown to reduce pain in patients with knee osteoarthritis.11 Ice massage and application of cold packs decrease swelling and improve range of motion and strength, but do not affect pain.10 The American Academy of Orthopaedic Surgeons (AAOS) recently updated its guideline on the treatment of knee osteoarthritis to focus on exercise-based therapies and targeted weight loss.7

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Treatment of Knee Osteoarthritis

Figure 1.

Algorithm for the treatment of knee osteoarthritis.

Treatment of Knee Osteoarthritis


Figure 1.

Algorithm for the treatment of knee osteoarthritis.

Patients with a body mass index greater than 25 kg per m2 should be encouraged to lose weight.7 The addition of a calorie-restricted diet (25% to 30% decrease) to a combined aerobic/strength-training program improves pain, function, and body composition scores vs. exercise alone.10 All types of exercise have been shown to improve osteoarthritis pain and physical function scores.37 Home exercise programs are as effective as a supervised clinical exercise program in improving function and six-minute walk distance in persons with knee osteoarthritis.9 Twisting and high-impact activities (e.g., running) should be avoided.

PHARMACOTHERAPY

Acetaminophen and nonsteroidal anti-inflammatory drugs (NSAIDs) improve pain in patients with osteoarthritis and are considered first-line treatments. Randomized controlled trials (RCTs) have shown that acetaminophen is as effective as ibuprofen, regardless of the dosage.38,39 A recent double-blind RCT found that extended-release acetaminophen (1,300 mg three times daily) is effective for knee and hip osteoarthritis pain and is well tolerated.13 Furthermore, a 2004 systematic review of five RCTs suggested that acetaminophen should be considered initial therapy because it is effective and has fewer adverse effects than NSAIDs.40 Acetaminophen is especially appropriate as first-line therapy in patients who cannot tolerate NSAIDs.14 A systematic review of 13 high-quality RCTs concluded that acetaminophen provides modest short-term relief for knee and hip osteoarthritis.41 It is important to confirm that patients who report lack of benefit have taken acetaminophen continuously and at an adequate dosage.

Selective and nonselective NSAIDs are equally effective in the treatment of osteoarthritis.7,8 A meta-analysis showed that NSAIDs should not be used for long-term treatment, but that limited use is superior to placebo.42 Because of the gastrointestinal and renal adverse effects associated with nonselective NSAIDs, the lowest effective dosage should be used.

Topical NSAIDs and topical capsaicin are effective in patients with knee osteoarthritis who cannot tolerate oral NSAIDs. Local skin reactions are the most common adverse effects, and systemic adverse effects for both agents were similar to those for placebo.4244 A 2012 RCT showed that in patients with knee osteoarthritis that was not adequately controlled with NSAIDs, adding a combination of tramadol/acetaminophen significantly improved pain, although neither agent was superior when added alone.45

Opioid analgesics are an option for patients with symptomatic knee osteoarthritis in whom previous medical management has been ineffective and who are not candidates for total joint arthroplasty.8 A Cochrane review found low-quality evidence to support the effectiveness of opioids in carefully selected patients. These agents should not be used in patients with a history of substance abuse.46 Vitamin D supplementation has not been proven beneficial in reducing pain from knee osteoarthritis.47 The AAOS does not recommend the use of glucosamine/chondroitin supplementation in persons with knee osteoarthritis,10 and studies have shown mixed benefit.1517 One recent RCT showed that glucosamine/chondroitin supplementation provided clinically significant pain relief,18 but Cochrane reviews suggest that glucosamine is no better than placebo.48 In addition, a Cochrane review of low-quality studies found that chondroitin supplementation only marginally improved pain in patients with osteoarthritis.49

INJECTIONS

Intra-articular corticosteroid injections are commonly used in the management of knee osteoarthritis. A Cochrane review showed that although this therapy is effective, pain relief lasts for only one to two weeks.50 The AAOS does not make a strong recommendation on the use of corticosteroid injections for the treatment of knee osteoarthritis. If used, they should not be given more often than once every three months.19

Hyaluronic acid injections (viscosupplementation) for the treatment of knee osteoarthritis are controversial. Initial studies and meta-analyses were promising, specifically in patients with severe disease.51 However, more recent data cite a lack of high-quality studies showing a beneficial effect. A high-quality 2012 systematic review concluded that viscosupplementation provided no clinically significant improvement in pain or function compared with saline or placebo injection.52 The most recent recommendations from the American College of Rheumatology and Osteoarthritis Research Society International include hyaluronic acid injections in the treatment regimen for osteoarthritis if initial conservative interventions are ineffective.8,20 However, the AAOS does not recommend them for patients with chronic osteoarthritis.7 Because higher-quality evidence shows a lack of benefit from viscosupplementation, it is best reserved for patients in whom other pharmacologic and nonpharmacologic treatment options are ineffective and who have less advanced osteoarthritis, are poor surgical candidates, or are younger than 65 years. Older patients and those with more severe disease are not likely to respond to viscosupplementation.51

BRACES, ORTHOSES, AND OTHER THERAPIES

There is little evidence that the use of knee braces causes harm; therefore, it is a reasonable option to consider as part of a multidisciplinary approach to the management of chronic overuse injuries, including knee osteoarthritis. However, the use of a brace should not replace a comprehensive physical therapy or home exercise program that addresses functional deficits in strength and flexibility. Small studies have shown medial unloader valgus braces to be beneficial in patients with predominant medial compartment osteoarthritis.21,22

There is no evidence that orthoses decrease pain or improve function in patients with knee osteoarthritis.22 A recent study recommended against the use of lateral wedge inserts, which agrees with the recent AAOS guideline.53 A 2010 Cochrane review on the use of therapeutic ultrasonography for knee osteoarthritis concluded that studies were small and of poor quality, and did not show evidence of clinically or statistically significant benefit.12

Patellofemoral Pain Syndrome

PHYSICAL THERAPY

Active treatments, such as strength training and stretching, are the first-line therapies for patellofemoral pain syndrome (PFPS). Strengthening exercises targeting the quadriceps and hip musculature, combined with stretching of the quadriceps, hamstrings, hip abductors, and iliotibial band complex, are often recommended.23 A Cochrane review concluded that based on low-quality studies, there is likely some benefit for exercise in patients with PFPS, but researchers could not draw conclusions about the most effective modality.54 Figures 2 through 5 demonstrate stretching and strengthening exercises that are often used in the treatment of PFPS.

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Figure 2.

Hamstring stretch for patients with patellofemoral pain syndrome. (A) The patient lies in the supine position, with the knee of the affected leg bent and the patient gripping the thigh to hold it steady. (B) The patient extends the leg at the knee, holding for 30 to 60 seconds. This exercise is performed twice daily for two repetitions each time.


Figure 2.

Hamstring stretch for patients with patellofemoral pain syndrome. (A) The patient lies in the supine position, with the knee of the affected leg bent and the patient gripping the thigh to hold it steady. (B) The patient extends the leg at the knee, holding for 30 to 60 seconds. This exercise is performed twice daily for two repetitions each time.

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Figure 3.

Hip abductor strengthening exercise for patients with patellofemoral pain syndrome. (A) The patient stands with the foot of one leg on a platform, keeping the pelvis parallel with the floor. (B) The opposite leg is lowered slowly while the supported leg remains in knee extension. (C) The gluteal muscles are contracted, which elevates the unsupported leg and returns the pelvis parallel with the floor. This exercise is performed for three sets of 10 repetitions each.


Figure 3.

Hip abductor strengthening exercise for patients with patellofemoral pain syndrome. (A) The patient stands with the foot of one leg on a platform, keeping the pelvis parallel with the floor. (B) The opposite leg is lowered slowly while the supported leg remains in knee extension. (C) The gluteal muscles are contracted, which elevates the unsupported leg and returns the pelvis parallel with the floor. This exercise is performed for three sets of 10 repetitions each.

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Figure 4.

Isometric quadriceps strengthening exercise for patients with patellofemoral pain syndrome. (A) The patient sits on a flat surface with the affected leg bent. (A rolled towel can be placed under the knee.) (B) The patient extends the leg at the knee, pressing toward the ground for 10 seconds. This exercise is performed for three sets of 10 repetitions each.


Figure 4.

Isometric quadriceps strengthening exercise for patients with patellofemoral pain syndrome. (A) The patient sits on a flat surface with the affected leg bent. (A rolled towel can be placed under the knee.) (B) The patient extends the leg at the knee, pressing toward the ground for 10 seconds. This exercise is performed for three sets of 10 repetitions each.

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Figure 5.

Quadriceps straight leg raise for patients with patellofemoral pain syndrome. The patient sits or lies on a flat surface with the affected leg outstretched and the unaffected leg flexed. The patient lifts the affected leg 8 inches off the surface and slowly lowers the leg to the ground over two to four seconds. This exercise is performed for three sets of 10 repetitions each.


Figure 5.

Quadriceps straight leg raise for patients with patellofemoral pain syndrome. The patient sits or lies on a flat surface with the affected leg outstretched and the unaffected leg flexed. The patient lifts the affected leg 8 inches off the surface and slowly lowers the leg to the ground over two to four seconds. This exercise is performed for three sets of 10 repetitions each.

Patellar taping has mixed results in the treatment of PFPS. A Cochrane review showed no significant effect on pain,55 whereas a recent meta-analysis showed that early taping helped improve pain scores.24 Evidence to support transcutaneous electrical stimulation, biofeedback, or chiropractic manipulation is limited.

PHARMACOTHERAPY

Limited data show that NSAIDs are effective in relieving short-term pain from PFPS.25 Evidence supporting the use of other oral analgesics is lacking.

BRACES AND ORTHOSES

Foot orthoses—with or without physical therapy—are effective for the treatment of anterior knee pain.56 Lateral tracking of the patella may contribute to the pathology associated with the pain and limited function of PFPS. Although it is common practice to suggest a trial of a lateral buttress patellar brace in patients with PFPS, strong evidence to support this practice is lacking. However, no data suggest that using a brace to determine whether the patient could benefit will result in harm.26,27

Meniscal, Tendon, and Ligament Injuries

PHYSICAL THERAPY

Degenerative meniscal tears are common in patients with osteoarthritis. Patients should be referred to an orthopedic surgeon only if mechanical symptoms are present (locking or catching). Physical therapy and a structured exercise program are first-line treatments.7 Active rehabilitation is as effective as arthroscopy in decreasing pain and improving function in patients with nontraumatic, degenerative medial meniscal tears.28 A recent study involving patients with concomitant osteoarthritis and meniscal tears showed that physical function scores at six and 12 months were similar in patients who underwent a partial meniscectomy vs. those who completed physical therapy alone.29 Eccentric exercise has been proven beneficial for treating patellar tendinosis.30

PHARMACOTHERAPY

NSAIDs may provide short-term relief of pain associated with ligamentous tears, including cruciate and collateral ligament tears. Although NSAIDs are effective in decreasing pain and helping patients with ankle sprains return to physical activity, studies have not been performed in patients with ligamentous knee pain, and the effect of NSAID therapy on tendinopathy is uncertain.31 Although there are no high-quality studies examining the effectiveness of oral analgesics for meniscal tears, it is common practice to use NSAIDs or acetaminophen.

INJECTIONS

Although physicians should avoid injecting corticosteroids into weight-bearing tendons such as the quadriceps and patellar tendon at the knee, it is accepted practice to provide a local corticosteroid injection over the femoral epicondyle in patients with iliotibial band friction syndrome if conservative measures are ineffective.32 Regenerative injections, using dextrose-based or platelet-rich plasma, are an emerging option for the care of chronic musculoskeletal conditions if conservative care is ineffective. Regenerative injections have shown modest improvements in pain and function in the treatment of chronic patellar tendinopathy 5759 and osteoarthritis.6062 Although the results of small studies are promising, further research with large RCTs is needed before definitive recommendations can be made.

BRACES, ORTHOSES, AND OTHER THERAPIES

Short-term use of a knee immobilizer brace can protect the knee immediately after an acute injury, such as complete major ligament or tendon tears and patellar fracture or dislocation. In patients with grade 1 or 2 medial collateral ligament injuries, minimally restrictive bracing can be helpful when combined with oral analgesics and early physical therapy.34 Braces commonly used for overuse knee conditions include an iliotibial band strap for patients with iliotibial band friction syndrome or an infrapatellar strap for those with patellar tendinopathy 33; however, these braces have not been studied in robust clinical trials. A Cochrane review found insufficient evidence regarding deep friction tissue massage for the treatment of lateral knee tendinitis.63 Patients with partial anterior cruciate ligament tears may benefit from bracing during the acute injury phase, such as a hinged knee brace coupled with range-of-motion exercises.35 Patients with full-thickness tears should be referred to an orthopedic surgeon.

Data Sources: We conducted literature searches using Ovid, PubMed, the Cochrane database, Essential Evidence Plus, and guidelines from major orthopedic and rheumatologic organizations, focusing on the keywords knee osteoarthritis, meniscal tears, ligament and tendon tears, patellofemoral syndrome, pharmacotherapy, physical therapy, bracing, orthotics, proinflammatory injections, corticosteroid injections, and hyaluronic acid injections. Search dates: May 30, 2014, to February 4, 2015.

The opinions and assertions contained herein are the private views of the authors and are not to be construed as official or as reflecting the views of the U.S. Air Force Medical Department or the U.S. Air Force at large.

The Authors

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BRANDON Q. JONES, MD, is a family physician at Menlo Medical Clinic in Menlo Park, Calif. At the time the article was written, he was an assistant professor at Nellis Family Medicine Residency at Mike O'Callaghan Federal Medical Center, Nellis Air Force Base, Nev....

CARLTON J. COVEY, MD, is a fellow at the National Capital Consortium's Military Primary Care Sports Medicine Fellowship, Bethesda, Md. At the time the article was written, he was an assistant professor at Nellis Family Medicine Residency at Mike O'Callaghan Federal Medical Center, Nellis Air Force Base.

MARVIN H. SINEATH, JR., MD, is an assistant professor and sports medicine physician at Nellis Family Medicine Residency at Mike O'Callaghan Federal Medical Center, Nellis Air Force Base.

Address correspondence to Brandon Q. Jones, MD, Menlo Medical Clinic, 321 Middlefield Rd, Ste. 260, Menlo Park, CA 94025 (e-mail: bqjones@gmail.com). Reprints are not available from the authors.

Author disclosure: No relevant financial affiliations.

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