Variability in effect sizes of exercise therapy for knee osteoarthritis depending on comparator interventions

BackgroundSystematic reviews of exercise therapy for knee osteoarthritis (OA) have largely ignored the variability in comparator interventions.ObjectiveTo assess how effect estimates of exercise therapy for knee OA as reported in randomized controlled trials vary depending on the comparator interventions.MethodsWe followed the Cochrane Handbook and PRISMA guidance to conduct and report this meta-epidemiological study. Randomised controlled trials (RCTs) were identified from systematic reviews published in 2015 or later and reference lists of included studies. Exercise therapy RCTs testing interventions that adhered to the American College of Sports Medicine (ACSM) guidelines compared to any comparator intervention in people with knee OA and reporting outcomes of knee pain, physical function and/or quadriceps strength at the end of intervention were included.ResultsThirty-five RCTs with 2412 participants were included. Comparator interventions included no intervention, non-ACSM compliant exercise therapy, education/self-management, and passive modalities. For pain, standardized mean difference (SMD) for ACSM compliant exercise therapy compared to passive modalities was 1.76 (95% CI 0.49, 3.04), no intervention 0.93 (95% CI 0.50; 1.36), education/self-management 0.27 (95% CI 0.07, 0.47), and non-ACSM compliant exercise therapy 0.09 (95% CI -0.06, 0.23). For physical function, SMD for ACSM compliant exercise therapy compared to passive modalities was 1.29 (95% CI 0.41, 2.17), no intervention 0.76 (95% CI 0.15, 1.36), non-ACSM compliant exercise therapy 0.25 (95% CI -0.00, 0.51) and education/self-management 0.21 (95% CI -0.14, 0.55). For quadriceps strength, SMD for ACSM compliant exercise therapy compared to no intervention was 0.69 (95% CI 0.42, 0.96), non-ACSM compliant exercise therapy 0.23 (95% CI -0.01, 0.46), education/self-management -0.02 (95% CI -0.45, 0.42) and passive modalities 0.80 (95% CI -0.10, 1.71).ConclusionThe effect of exercise therapy for knee OA varies significantly depending on the comparator intervention. This variability should be assessed routinely in systematic reviews.     

First-line treatment for osteoarthritis. Part 1: Pathophysiology,assessment, and pharmacologic interventions

While surgical interventions often relieve severe pain for those with osteoarthritis (OA), there are thousands of patients with this common and disabling condition who do not receive surgery. Pharmacologic and nonpharmacologic interventions may offer a reduction in pain and improvement in physical functioning. To help patients with OA, nurses should conduct thorough assessments based on pathophysiology, and plan appropriate care with the patient. In this first article of a two-part series, the pathophysiology and classification of OA are presented. Assessment factors are discussed, and pharmacologic interventions are presented. Part 2 of this series, to run in the November/December issue, will focus on nonpharmacologic interventions and evaluation.     

Management of the basal joint of the thumb following interposition arthroplasty for pain and instability

Derangement of the carpometacarpal (CMC) joint of the thumb secondary to osteoarthritis (OA) or rheumatoid arthritis (RA) is a source of pain and disability in many postmenopausal women. If surgery becomes necessary, the goals of postsurgical management are directed to relief of pain, joint protection and rest, and restoration of functional activity. This article describes the successful postsurgical rehabilitation of two patients with CMC joint arthritis of differing etiologies, and medical complexity, OA and RA, respectively, and different levels of medical complexity. Basal joint protection, passive range of motion, and gentle active exercise resulted in rapid functional recovery for these two patients.     

Management of the basal joint of the thumb following interposition arthroplasty for pain and instability

Derangement of the carpometacarpal (CMC) joint of the thumb secondary to osteoarthritis (OA) or rheumatoid arthritis (RA) is a source of pain and disability in many postmenopausal women. If surgery becomes necessary, the goals of postsurgical management are directed to relief of pain, joint protection and rest, and restoration of functional activity. This article describes the successful postsurgical rehabilitation of two patients with CMC joint arthritis of differing etiologies, and medical complexity, OA and RA, respectively, and different levels of medical complexity. Basal joint protection, passive range of motion, and gentle active exercise resulted in rapid functional recovery for these two patients.     

Investigation of the effect of conservative interventions in thumb carpometacarpal osteoarthritis: systematic review and meta-analysis

Abstract

Purpose: The purpose of this study was to conduct a current review of randomized controlled trials regarding the effect of conservative interventions on pain and function in people with thumb carpometacarpal (CMC) osteoarthritis (OA), perform a meta-analysis of the findings and summarize current knowledge. Method: Data were obtained from MEDLINE, CINAHL, Embase, PEDro and CENTRAL databases from their inception to May 2014. Reference lists of relevant literature reviews were also searched. All published randomized trials without restrictions to time of publication or language were considered for inclusion. Study subjects were symptomatic adults with thumb CMC OA. Two reviewers independently selected studies, conducted quality assessment and extracted results. Data were pooled in a meta-analysis, when possible, using a random-effects model. Quality of the body evidence was assessed using GRADE approach. Results: Sixteen RCTs involving 1145 participants met the inclusion criteria. Twelve were of high quality (PEDro score?>?6). We found moderate quality evidence that manual therapy and therapeutic exercise combined with manual therapy improve pain in thumb CMC OA at short- and intermediate-term follow-up, and from low to moderate quality evidences that magneto therapy improves pain and function at short-term follow-up. Orthoses (splints) were found to improve function at long-term follow-up and pinch strength at short-term follow-up. Finally, we found from very low to low-quality evidence that other conservative interventions provide no significant improvement in pain and in function at short- and long-term follow-up. Conclusions: Some of the commonly performed conservative interventions performed in therapy have evidence to support their use to improve hand function and decrease hand pain. Additional research is required to determine the efficacy of other therapeutic interventions that are performed with patients with thumb CMC OA.

• Implications for Rehabilitation

• Manual therapy and exercise are an effective means of improving pain and function at short-term follow-up by patients with thumb CMC OA.

• Magneto therapy, manual therapy, manual therapy and exercise and Orthoses (splints) were found to have clinically significant results.

• Very few of the included studies showed a clinically significant effect size in favor of treatment.

     

Strategies to support self-management in osteoarthritis: five categories of interventions, including education

OVERVIEW: This overview of successful strategies for supporting self-management in patients with osteoarthritis (OA) defines the concepts of self-management, self-management support (SMS), and self-management education (SME); describes five categories of SMS interventions; identifies common elements across SMS categories; and provides evidence for and examples of self-management tools that are useful in OA. SMS categories include SME, other skill-building and behavior-change interventions, supportive provider interactions, ongoing supportive follow-up, and environmental changes. Where available, relevant OA-specific SMS strategies are used to illustrate these categories.     

Improving maintenance of physical activity in older, knee osteoarthritis patients trial-pilot (IMPACT-P): design and methods

Promoting increased physical activity participation is now consistently advocated in the medical management of knee osteoarthritis (OA). Unfortunately, physical activity interventions targeting older knee OA patients are plagued by high attrition rates and poor long-term adherence. Consequently, identifying effective approaches for promoting maintenance of physical activity participation is integral for the successful behavioral management of knee OA. The present study, the Improving Maintenance of Physical Activity in Knee Osteoarthritis Pilot Trial (IMPACT-P), was a single-blind two-arm, randomized controlled pilot study designed to contrast the effects of a group-mediated cognitive behavioral (GMCB) exercise intervention with those of traditional center-based exercise therapy approach (TRAD) in older, knee OA patients. A total of 80 older adults with symptomatic knee OA were randomly assigned to GMCB or TRAD interventions. The primary outcome of the IMPACT-P study was changed in self-reported (CHAMPS questionnaire) and objectively assessed (LIFECORDER EX Plus) physical activity participation of moderate intensity or greater. Secondary outcomes include physical function, quality of life, and social cognitive variables. Outcomes were obtained at baseline, 3 month, and 12 month assessments by trial personnel blinded to participants' randomization assignment. Discussion. Determining the comparable efficacy of the GMCB and TRAD exercise interventions in producing meaningful improvements in physical activity and OA outcomes could enhance the efficacy of implementing physical activity participation in the behavioral management of symptomatic knee OA.     

A comparison of two manual physical therapy approaches and electrotherapy modalities for patients with knee osteoarthritis: A randomized three arm clinical trial

A broad spectrum of physical therapy exercise programs provides symptom relief and functional benefit for patients with knee OA. Manual physical therapy, including tailored exercise programs provide relatively higher level benefit that persists to one year. It is currently unknown if there are important differences in the effects of different manual physical therapy techniques for patients with knee OA and there are virtually no studies comparing manual physical therapy and electrotherapy modalities. The aim of the study was to compare long-term results between three treatment groups (mobilization with movements [MWMs], passive joint mobilization [PJM], and electrotherapy) to determine which treatment is most effective in patients with knee OA. A single-blind randomized clinical trial with parallel design was conducted in patients with knee OA. Seventy-two consecutive patients (mean age 56.11 ± 6.80 years) with bilateral knee OA were randomly assigned to one of three treatment groups: MWMs, PJM, and electrotherapy. All groups performed an exercise program and received 12 sessions. The primary outcome measures of the functional assessment were the Western Ontario and McMaster Universities Osteoarthritis index (WOMAC) and Aggregated Locomotor Function (ALF) test scores. The secondary outcome measures were pain level, measured using a pressure algometer and a visual analogue scale (VAS), range of motion (ROM), measured using a digital goniometer, and muscle strength, evaluated with a handheld dynamometer. Patients were assessed before treatment, after treatment and after 1 year of follow-up. Patients receiving the manual physical therapy interventions consisting of either MWM or PJM demonstrated a greater decrease in VAS scores at rest, during functional activities, and during the night compared to those in the electrotherapy group from baseline to after the treatment (p < 0.05). This improvement continued at the 1-year follow-up (p < 0.05). The MWMs and PJM groups also showed significantly improved WOMAC and ALF scores, knee ROM and quadriceps muscle strength compared to those in the electrotherapy group from baseline to 1-year follow-up (p < 0.05). In the treatment of patients with knee OA, manual physical therapy consisting of either MWM or PJM provided superior benefit over electrotherapy in terms of pain level, knee ROM, quadriceps muscle strength, and functional level.     

A theoretical model for preventing osteoarthritis-related disability.

Osteoarthritis (OA) affects many aspects of life for affected individuals. Effective interventions to prevent and restore function must be based upon an understanding of what contributes to OA and its associated disabilities. A hypothetical OA disability model built upon the previous work of Nagi (1991), Verbrugge and Jette (1994), the International Classification of Functioning of World Health Organization (World Health Organization, 2001), and other scientific findings is proposed. The model includes a main disease pathway, which describes the sequence of events from OA-associated impairments to disabilities. Contextual factors influencing the process include individual characteristics, psychological state, coping style, comorbidities, social support, and physical environment. The model provides a useful conceptual framework for understanding the OA disability process from a biopsychosocial perspective and for guiding rehabilitation nursing interventions in OA care.     

Venous leg ulcer patients: a review of the literature on lifestyle and pain-related interventions

Background. Having a leg ulcer has a major impact on daily life. Lifestyle is mentioned in most leg ulcer guidelines but mostly without much emphasis on the subject. Aims and objectives. Evidence for the effect of nutrition, leg elevation and exercise on the healing of leg ulcers was reconsidered. Furthermore, the evidence for effective pain‐related interventions was investigated. Design. Systematic literature review. Methods. Medline, Cinahl, Psychinfo and Cochrane were searched for studies on pain related interventions, and the effectiveness of leg elevation, leg exercise and nutritional interventions in patients with venous leg ulceration. Results. Some evidence was found to support a positive effect of leg exercises on the endurance and power of the calf muscle and on the haemodynamic status of the limb. There is also evidence for a positive effect of leg elevation during bed rest without compression. No hard evidence was found concerning the effect of enriched or altered nutrition on wound healing. However, there is some evidence of nutritional deficits in this patient group. The use of eutectic mixture of local anaesthetic cream is effective for reducing pain in wound debridement, but pain relief in daily life is insufficiently treated. Conclusion. There is no real evidence of effectiveness of the investigated lifestyle interventions but there are indications that lifestyle interventions might contribute to healing or prevention of venous leg ulceration. Relevance to clinical practice. Although there is no hard evidence, it can be expected that interventions such as nutritional monitoring, guided exercise and leg elevation will have a substantial impact on wound healing in patients with venous leg ulceration. The use of eutectic mixture of local anaesthetic cream can be advised for pain relief with wound debridement. The current lack of effective pain treatment with venous leg ulceration emphasizes the need for effective pain treatment.     

Efficacy and potential determinants of exercise therapy in knee and hip osteoarthritis: A systematic review and meta-analysis

BackgroundExercise is an effective treatment for osteoarthritis. However, the effect may vary from one patient (or study) to another.ObjectiveTo evaluate the efficacy of exercise and its potential determinants for pain, function, performance, and quality of life (QoL) in knee and hip osteoarthritis (OA).MethodsWe searched 9 electronic databases (AMED, CENTRAL, CINAHL, EMBASE, MEDLINE Ovid, PEDro, PubMed, SPORTDiscus and Google Scholar) for reports of randomised controlled trials (RCTs) comparing exercise-only interventions with usual care. The search was performed from inception up to December 2017 with no language restriction. The effect size (ES), with its 95% confidence interval (CI), was calculated on the basis of between-group standardised mean differences. The primary endpoint was at or nearest to 8 weeks. Other outcome time points were grouped into intervals, from < 1 month to ≥ 18 months, for time-dependent effects analysis. Potential determinants were explored by subgroup analyses. Level of significance was set at P ≤ 0.10.ResultsData from 77 RCTs (6472 participants) confirmed statistically significant exercise benefits for pain (ES 0.56, 95% CI 0.44–0.68), function (0.50, 0.38–0.63), performance (0.46, 0.35–0.57), and QoL (0.21, 0.11–0.31) at or nearest to 8 weeks. Across all outcomes, the effects appeared to peak around 2 months and then gradually decreased and became no better than usual care after 9 months. Better pain relief was reported by trials investigating participants who were younger (mean age < 60 years), had knee OA, and were not awaiting joint replacement surgery.ConclusionsExercise significantly reduces pain and improves function, performance and QoL in people with knee and hip OA as compared with usual care at 8 weeks. The effects are maximal around 2 months and thereafter slowly diminish, being no better than usual care at 9 to 18 months. Participants with younger age, knee OA and not awaiting joint replacement may benefit more from exercise therapy. These potential determinants, identified by study-level analyses, may have implied ecological bias and need to be confirmed with individual patient data.     

First-line treatment for osteoarthritis. Part 2: Nonpharmacologic interventions and evaluation

Because of the chronic nature of osteoarthritis, nonpharmacologic interventions provide the client with self-care strategies that may lessen pain, improve physical functioning, and increase independence and sense of control. Nonpharmacologic interventions include exercise, rest and joint protection, heat and cold, hydrotherapy, therapeutic touch, acupuncture/acupressure, biofeedback, hypnotherapy, cognitive-behavioral techniques, activity and home maintenance modification, nutrition, and transportation interventions. Most of these therapies are very useful for nurses as independent interventions. Suggestions for evaluation of interventions are made.     

Kaatsu training to enhance physical function of older adults with knee osteoarthritis: Design of a randomized controlled trial

As the U.S. population ages, efficacious interventions are needed to manage pain and maintain physical function among older adults with osteoarthritis (OA). Skeletal muscle weakness is a primary contributory factor to pain and functional decline among persons with OA, thus interventions are needed that improve muscle strength. High-load resistance exercise is the best-known method of improving muscle strength; however high-compressive loads commonly induce significant joint pain among persons with OA. Thus interventions with low-compressive loads are needed which improve muscle strength while limiting joint stress. This study is investigating the potential of an innovative training paradigm, known as Kaatsu, for this purpose. Kaatsu involves performing low-load exercise while externally-applied compression partially restricts blood flow to the active skeletal muscle. The objective of this randomized, single-masked pilot trial is to evaluate the efficacy and feasibility of chronic Kaatsu training for improving skeletal muscle strength and physical function among older adults. Participants aged ≥ 60 years with physical limitations and symptomatic knee OA will be randomly assigned to engage in a 3-month intervention of either (1) center-based, moderate-load resistance training, or (2) Kaatsu training matched for overall workload. Study dependent outcomes include the change in 1) knee extensor strength, 2) objective measures of physical function, and 3) subjective measures of physical function and pain. This study will provide novel information regarding the therapeutic potential of Kaatsu training while also informing about the long-term clinical viability of the paradigm by evaluating participant safety, discomfort, and willingness to continually engage in the intervention.     

Role of hylan G-F 20 in treatment of osteoarthritis of the hip joint

OBJECTIVE: To study the efficacy of hylan G-F 20 in the treatment of osteoarthritis (OA) of the hip joint. DESIGN: Prospective within-group study. SETTING: Musculoskeletal rehabilitation clinic. PARTICIPANTS: Twenty-two patients (25 hips) with hip joint OA who had failed to find pain relief from conservative methods such as physical therapy, exercises, and steroid injections. Demographics included 14 men and 11 women (mean age, 56.4y), 21 of whom had mild to moderate OA and 4 of whom had severe OA of the hips. INTERVENTION: Each hip joint was injected with 2mL of hylan G-F 20 at 2, 3, and 4 weeks and fluoroscopic lavage with 100mL of normal saline at week 1. All patients had standard hip exercise regimen after the injection. MAIN OUTCOME MEASURES: American Academy of Orthopaedic Surgeons (AAOS) Lower Limb Core Scale score and visual numeric pain score. RESULTS: At 1-year follow-up, the AAOS Lower Limb Core Scale score improved from a preinjection mean of 44.2 to a follow-up mean of 86.1 (P<.05). The mean visual numeric pain score improved from a preinjection mean of 8.7 (range, 6.4-10) to a follow-up mean of 2.3 (range, 0-7.2). The overall success rate was 84%. In patients with mild to moderate OA, the mean pain score decreased from a preinjection value of 7.8 to a follow-up value of 1.7. The success rate was 90.5% in that subgroup. In patients with severe OA, the mean pain score decreased from a preinjection value of 9.1 to a follow-up value of 3.8. The success rate was 50% in that subgroup. There were no complications related to the injection. CONCLUSION: Use of hylan G-F 20 injection is a viable option for treatment of mild to moderate OA of the hip joint.     

Effectiveness of nonpharmacological and nonsurgical interventions for hip osteoarthritis: an umbrella review of high-quality systematic reviews

An increasing number of systematic reviews are available regarding nonpharmacological and nonsurgical interventions for hip osteoarthritis (OA). The objectives of this article are to identify high-quality systematic reviews on the effect of nonpharmacological and nonsurgical interventions for hip OA and to summarize available high-quality evidence for these treatment approaches. The authors identified and screened 204 reviews. Two independent reviewers using a previously pilot-tested quality assessment form assessed the full text of 58 reviews. Six reviews were of sufficient high quality and could be included for further analyses. There was moderate-quality evidence that acupuncture and diacerein have no effect on pain and function. There was low-quality evidence that strengthening exercises and avocado/soybean unsaponifiables reduce pain and that diacerein decreases radiographic OA progression. There was insufficient high-quality evidence regarding nonpharmacological and nonsurgical interventions for hip OA, and further primary studies and reviews are needed.     

Optimising pain control in osteoarthritis

A recent large survey showed that 81% of people with osteoarthritis (OA) are in constant pain or are limited in their ability to perform everyday tasks. Patients present with joint pain and stiffness and are often unable to carry out their usual activities which impacts significantly on their quality of life. Anxiety and depression are common in patients with OA and will affect their mood and response to pain so identifying and treating associated anxiety and depression is very important. The PHQ9 and GAD7 can be used to screen for depression and anxiety. The OA process affects all structures within a joint, including the synovial lining and the subchondral bone. When sensitive MRI techniques are used synovitis is found to be almost ubiquitous in painful knee OA. When ultrasound is used, synovitis is seen in up to 45% of patients with painful hand OA. Many current treatments for OA are thought to target the synovium e.g. NSAIDs and this may be why they are effective. Changes in the subchondral bone are also common on MRI and associated with pain. Paracetamol and topical NSAIDs should be tried before oral NSAIDs. Topical NSAIDs are effective in the short-term and are not associated with systemic toxicity. Oral NSAIDs should be used at the lowest effective dose for the shortest possible time. All oral NSAIDs and COX-2 drugs should be prescribed with a PPI. There is less trial data on opioids than on NSAIDs but there is evidence for their efficacy. Patients who have moderate to severe pain that is not responding to oral analgesics or anti-inflammatories may benefit from intra-articular corticosteroids. Timing of analgesia is important. Advise patients to use analgesia before they exercise, so adherence to exercise routines is maintained. Consider long-acting preparations so pain relief is at a maximum throughout the most symptomatic period of the day or night.     

A meta-analysis of exercise interventions among people treated for cancer

Goal This review applied meta-analytic procedures to integrate primary research findings that tested exercise interventions among people treated for cancer.Methods Extensive literature searching strategies located published and unpublished intervention studies that tested exercise interventions with at least five participants (k=30). Primary study results were coded. Meta-analytic procedures were conducted.Main results The overall weighted mean effect size (ES) for two-group comparisons was 0.52 (higher mean for treatment than control) for physical function, 0.35 for symptoms other than fatigue, and 0.27 for body composition. More modest positive ESs were documented for mood (0.19), quality of life (0.14), fatigue (0.11), and exercise behavior (0.04). ESs were larger among single-group pre–post design studies. ESs among control group participants were typically negative and not (statistically) significantly different from 0.Conclusions Exercise interventions resulted in small positive effects on health and well-being outcomes among existing studies. Future research should examine intervention-specific characteristics that result in optimal results, such as dose.     

Mechanical and Sensorimotor Implications With Ankle Osteoarthritis

Hubbard TJ, Hicks-Little C, Cordova M. Mechanical and sensorimotor implications with ankle osteoarthritis.

Objective

To understand the mechanical and sensorimotor adaptations that may occur with ankle osteoarthritis (OA).

Design

Case-control.

Setting

Biodynamics research laboratory.

Participants

Subjects with ankle OA (n=8; 4 males, 4 females) were matched to healthy controls (n=8; 4 males, 4 females).

Interventions

Not applicable.

Main Outcome Measures

Mechanical joint stability was assessed with an instrumented ankle arthrometer. Static balance was measured using a force platform during a double-legged stance. Isometric ankle/foot complex strength in the sagittal and frontal plane was assessed with a handheld dynamometer. Last, subjective level of function was assessed using the foot and ankle disability index.

Results

There were significant group × side interactions for anterior displacement, inversion rotation, eversion rotation, ankle isometric strength, and the foot and ankle disability index (P<.05). The affected ankle of the OA group demonstrated significantly more mechanical stiffness, more impairments in ankle/foot isometric strength, and less subjective level of function than the matched controls. Additionally, the ankle OA group exhibited significantly more center of pressure displacement, total velocity, and medial-lateral velocity (P<.05).

Conclusions

These limitations observed in joint laxity, postural control, muscle strength, and perceived function provide evidence that patients with ankle OA display a number of characteristics that affect joint stability and overall function. These identified impairments necessitate the need for rehabilitation and exercise programs to be developed to help improve joint stability and function in patients with ankle OA.     

Delayed onset of quadriceps activity and altered knee joint kinematics during stair stepping in individuals with knee osteoarthritis

OBJECTIVE: To determine if the electromyographic onset of vastus lateralis and kinematic knee joint motion in individuals with knee osteoarthritis (OA) differs from that of asymptomatic persons, during the task of stair stepping. DESIGN: Cross-sectional. SETTING: University laboratory in Australia. PARTICIPANTS: Twenty-five participants with symptomatic knee OA and 33 asymptomatic controls. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Surface electromyography to determine the onset of vastus lateralis activity. Two-dimensional kinematic analysis of sagittal plane knee motion during stance phase of stair ascent and descent. RESULTS: Participants with knee OA showed delayed onset of vastus lateralis activity during stair descent (P<.05) but not ascent. Both groups displayed a similar total range of knee motion. However, during stair descent, participants with OA had less knee flexion during early stance (P<.05) than controls. CONCLUSION: Individuals with knee OA display altered quadriceps function and knee joint kinematics during stair descent. These impairments may have implications for force attenuation across the knee joint and warrant future investigation.     

Therapeutic exercise for knee osteoarthritis: considering factors that may influence outcome

While exercise has been shown to be beneficial for reducing pain and improving physical function in individuals with knee osteoarthritis (OA), there are still individuals who do not always respond well to this treatment approach. There are a number of factors that have been shown to influence either the degree of disability and/or the progression of disease in individuals with knee OA. These factors include quadriceps inhibition or activation failure, obesity, passive knee laxity, knee alignment, fear of physical activity and self efficacy. It may be possible that varying levels of these factors might also interfere with an individual's ability to participate in an exercise or physical activity program or minimize the benefits that can be achieved by such programs. This paper examines the influence of these factors on physical function and their potential for altering the outcome of exercise therapy programs for individuals with knee OA. Implications and suggestions for potential adjunctive interventions to address these factors in future research and clinical practice are also discussed.