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This is the clinical evidence summary written for health professionals. It is technical, and it lists the research this page was built from. You do not need to read it to understand your treatment or to make a decision about it.

Overview¶

• Obesity is a modifiable condition, and addressing it can improve the orthopaedic and overall health of children [1].
• Each 1-unit increase in body mass index (BMI) is associated with a 9% reduction in osteoporosis risk [2].
• There is significant confusion regarding the relationship between energy intake, energy expenditure, and obesity, with greater attention focused on diet than on physical inactivity [3].
• Obesity is a systemic disease with profound inflammatory consequences on joint health, extending beyond mechanical burden on the knee [5].
• Current evidence does not support the routine use of tibial stem extensions in obese total knee arthroplasty patients due to insufficient, heterogeneous, and very low certainty data [7].
• Increasing obesity severity is not associated with higher rates of postoperative stiffness or inferior outcomes following manipulation under anesthesia (MUA) [10].
• Concern for stiffness alone should not serve as a categorical barrier to total knee arthroplasty (TKA) or MUA when clinically indicated [10].
• In a cohort of obese patients who underwent total hip arthroplasty (THA), the World Health Organization (WHO) obesity class was not associated with the risk, invasiveness, or timing of reoperations [15].
• Obese and overweight patients converted to total hip arthroplasty (THA) at significantly higher rates compared with normal-weight patients following hip arthroscopy for femoroacetabular impingement syndrome [16].
• The ten-year functional outcomes and revision rates of total hip arthroplasty (THA) do not justify restricting access to surgery on the basis of body mass index (BMI) [28].

How It Works¶

Systemic and Metabolic Mechanisms¶

• Obesity is a systemic disease with profound inflammatory consequences on joint health [5].
• Each 1-unit increase in BMI is associated with a 9% reduction in osteoporosis risk [2].
• There is confusion regarding the relation of energy intake and energy expenditure to obesity, with more attention focused on diet than on physical inactivity [3].

Biomechanical and Structural Factors¶

• Following medial meniscus posterior root tear repair, osteoarthritis progression occurs at higher rates with elevated BMI [20].
• Obesity remains a critical risk factor for mechanical failures in functionally aligned image-based robotic total knee arthroplasty [14].
• Modern surgical practices and implant designs may have mitigated traditional obesity-related risks regarding loosening and mechanical failure in total knee arthroplasty [11].

Surgical Outcomes and Complications¶

• In patients undergoing primary total joint arthroplasty at an ambulatory surgical center, a BMI > 40 is not correlated with early complications [6].
• Focusing on management of preoperative comorbidities and custom surgical planning can achieve outcomes comparable to those of patients with normal BMIs at ambulatory surgical centers [6].
• Increasing obesity severity is not associated with higher rates of postoperative stiffness or inferior outcomes following manipulation under anesthesia for total knee arthroplasty [10].
• No significant differences were observed between above-average and below-average BMI groups in clinical improvements following arthroscopically assisted posterior latissimus dorsi tendon transfer for irreparable posterosuperior rotator cuff tears [9].
• A nonsignificant trend toward a higher complication rate was observed in patients with severe obesity (BMI ≥35 kg/m2) undergoing robotic-assisted total knee arthroplasty [22].
• A statistically significant increase in arthrofibrosis was found in patients with BMI <25 kg/m2 undergoing robotic-assisted total knee arthroplasty [22].
• The numbers were too small to draw conclusions in patients who have a BMI ≥ 45 undergoing cementless total knee arthroplasty [4].

Risk Stratification and Measurement¶

• Body mass index has a weak-to-moderate association with peri-incisional adiposity in primary total joint arthroplasty patients [21].
• The soft tissue-to-bone ratio reflects local anatomical factors that directly influence surgical exposure and wound healing, unlike BMI [19].

Modifiability and Intervention¶

• Obesity is modifiable, and addressing the issue can improve the orthopaedic and overall health of children [1].
• Physical activity equivalent to approximately 30–35 min of vigorous intensity per week appears to offset the association between abdominal obesity and incident cardiovascular disease [8].
• When combined with liraglutide treatment, exercise results in a more holistic state of health that may result in improved longer-term health and may enhance adherence to the treatment and promote longer-term weight-loss maintenance [12].
• An aggregate exercise programme energy expenditure (>10 000 kcal) may be required to promote reductions in intrahepatic fat [13].

What the Evidence Shows¶

Systemic and Metabolic Associations¶

• Obesity is a systemic disease with profound inflammatory consequences on joint health, extending beyond mechanical burden [5].
• An aggregate exercise programme energy expenditure greater than 10,000 kcal may be required to promote reductions in intrahepatic fat in adults who are overweight or exhibit fatty liver disease [13].
• Physical activity equivalent to approximately 30–35 minutes of vigorous intensity per week appears to offset the association between abdominal obesity and incident cardiovascular disease [8].

Pediatric and General Health¶

Preoperative Weight Management¶

• Semaglutide appears to be a safe alternative to bariatric surgery for weight management before total hip arthroplasty, with similar implant survival and postoperative complication rates [17].
• In patients with severe obesity and advanced knee osteoarthritis, total weight loss percentage was higher in bariatric surgery patients (28.7%) compared to those undergoing immediate total knee arthroplasty [26].
• Women had decreased odds of losing greater than five pounds before surgery despite increased odds of having preoperative bariatric surgery [18].
• Women with high-intensity interval training had significant reduction in their weight and BMI compared to those who followed a moderate-intensity continuous training protocol [27].

Knee Arthroplasty¶

• Current evidence does not support the routine use of tibial stem extensions in obese total knee arthroplasty patients due to insufficient, heterogeneous, and very low certainty data, though specific designs may benefit selected populations [7].
• Obesity remains a critical risk factor for mechanical failures in functionally aligned image-based robotic total knee arthroplasty, despite comparable functional outcomes [14].
• Obese patients are at increased risk of a higher rate of revision following unicompartmental knee arthroplasty [31].
• The numbers of patients with a BMI ≥ 45 were too small to draw conclusions regarding the safety of cementless total knee arthroplasty in that specific group [4].

Hip Arthroplasty¶

• In morbidly obese patients, dual mobility implants demonstrated excellent five-year survivorship with outcomes comparable or slightly superior to fixed-bearing constructs [24].

Hip Arthroscopy and Rotator Cuff¶

• Obese and overweight patients converted to total hip arthroplasty at significantly higher rates compared with normal-weight patients following hip arthroscopy for femoroacetabular impingement syndrome [16].
• Hip arthroscopy for the treatment of femoroacetabular impingement and labral tears in patients with obesity yielded significant and sustainable long-term improvements, which were equivalent to those of a benchmark matched control group of normal-weight patients [25].
• No significant differences were observed between above-average and below-average BMI groups, and BMI was not correlated with clinical improvements following arthroscopically assisted posterior latissimus dorsi tendon transfer for irreparable posterosuperior rotator cuff tears [9].

Practical Considerations¶

Pediatric and Systemic Health¶

• There is significant confusion regarding the relationship between energy intake, energy expenditure, and obesity, with greater attention historically focused on diet than on physical inactivity [3].

Bone Density and Cardiovascular Risk¶

• Each 1-unit increase in body mass index is associated with a 9% reduction in osteoporosis risk [2].

Total Knee Arthroplasty¶

• A body mass index of 45 is identified as a safe cut-off for cementless total knee arthroplasty, though sample sizes were too small to draw conclusions for patients with a BMI ≥ 45 [4].
• Body mass index greater than 40 is not correlated with early complications in patients undergoing primary total joint arthroplasty at an ambulatory surgical center [6].
• Focusing on the management of preoperative comorbidities and custom surgical planning can achieve outcomes comparable to those of patients with normal BMIs at ambulatory surgical centers [6].
• Specific tibial stem extension designs may benefit selected populations of obese total knee arthroplasty patients [7].
• Increasing obesity severity is not associated with higher rates of postoperative stiffness or inferior outcomes following manipulation under anesthesia [10].
• Concern for stiffness alone should not serve as a categorical barrier to total knee arthroplasty or manipulation under anesthesia when clinically indicated [10].

Total Hip Arthroplasty¶

• The World Health Organization obesity class is not associated with the risk, invasiveness, or timing of reoperations after total hip arthroplasty in obese patients [15].

Shoulder and Rotator Cuff¶

• Body mass index does not affect clinical outcomes following arthroscopically assisted posterior latissimus dorsi tendon transfer for irreparable posterosuperior rotator cuff tears [9].
• No significant differences were observed between above-average and below-average BMI groups regarding clinical improvements in arthroscopically assisted posterior latissimus dorsi tendon transfer [9].
• Obesity is associated with an increased risk of all-cause revisions in patients receiving reverse total shoulder arthroplasty indicated for fractures [23].
• Obesity is associated with an increased risk of revision for instability or dislocation in patients receiving reverse total shoulder arthroplasty indicated for fractures [23].

Key Evidence¶

• [L5] Obesity is modifiable, and addressing the issue can improve the orthopaedic and overall health of children. [1] (10.5435/jaaosglobal-d-19-00036)
• [L1] Based on our dose–response analysis of nine studies, each 1-unit increase in BMI was associated with a 9% reduction in osteoporosis risk. [2] (10.1186/s12891-026-09675-3)
• [L5] There is enormous confusion about the relation of energy intake and energy expenditure to obesity, with much more attention focused on diet and obesity than on physical inactivity and obesity. [3] (10.1136/bjsports-2015-094911)
• [L3] However, the numbers were too small to draw conclusions in patients who have a BMI ≥ 45. [4] (10.1016/j.arth.2025.12.038)
• [L5] Obesity is more than a mechanical burden on the knee; it is a systemic disease with profound inflammatory consequences on joint health. [5] (10.1002/arj.70051)
• [L3] Focusing on management of preoperative comorbidities and custom surgical planning can achieve outcomes comparable to those of patients who have normal BMIs at ASCs, questioning BMI as an exclusion criterion and advocating for more inclusive, evidence-based patient selection. [6] (10.1016/j.arth.2025.08.065)
• [L5] The authors conclude that current evidence does not support the routine use of tibial stem extensions in obese total knee arthroplasty patients due to insufficient, heterogeneous, and very low certainty data, though specific designs may benefit selected populations. [7] (10.1016/j.arth.2025.11.056)
• [L3] Physical activity equivalent to approximately 30–35 min of vigorous intensity per week appears to offset the association between abdominal obesity and incident CVD. [8] (10.1136/bjsports-2023-107252)
• [L2] No significant differences were observed between above-average and below-average BMI groups, and BMI was not correlated with clinical improvements. [9] (10.1016/j.xrrt.2025.100634)
• [L3] These findings suggest that increasing obesity severity is not associated with higher rates of postoperative stiffness or inferior outcomes following MUA and that concern for stiffness alone should not serve as a categorical barrier to TKA or MUA when clinically indicated. [10] (10.1016/j.arth.2026.03.080)
• [L3] These findings suggest modern surgical practices and implant designs may have mitigated traditional obesity-related risks. [11] (10.1016/j.arth.2026.04.031)
• [Paper] It is clear that, when combined with liraglutide treatment, exercise results in a more holistic state of health that may result in improved longer-term health and may enhance adherence to the treatment and promote longer-term weight-loss maintenance. [12] (10.1136/bjsports-2021-104754)
• [L1] An aggregate exercise programme energy expenditure (>10 000 kcal) may be required to promote reductions in intrahepatic fat. [13] (10.1136/bjsports-2016-096197)
• [L3] However, obesity remains a critical risk factor for mechanical failures. [14] (10.1016/j.jisako.2025.100861)
• [L3] In this cohort of obese patients who underwent THA, the WHO obesity class was not associated with risk, invasiveness, or timing of reoperations. [15] (10.1016/j.arth.2025.07.026)
• [L3] Obese and overweight patients converted to THA at significantly higher rates compared with normal-weight patients. [16] (10.1177/03635465251400355)
• [L3] Semaglutide appears to be a safe alternative to bariatric surgery for weight management before THA, with similar implant survival and postoperative complication rates. [17] (10.1016/j.arth.2025.08.068)
• [L3] Women had decreased odds of losing greater than five pounds before surgery despite increased odds of having preoperative bariatric surgery. [18] (10.1016/j.arth.2026.06.021)
• [L3] Unlike BMI, the STiB ratio reflects local anatomical factors that directly influence surgical exposure and wound healing. [19] (10.1016/j.arth.2025.09.022)
• [L1] Following MMPRT repair, repairs show progression of osteoarthritis with higher rates seen with elevated BMI. [20] (10.1002/arj.70028)
• [L3] BMI has a weak-to-moderate association with peri-incisional adiposity in primary total joint arthroplasty patients. [21] (10.1016/j.arth.2024.08.020)
• [L2] However, a nonsignificant trend toward a higher complication rate was observed in patients with severe obesity (BMI ≥35 kg/m2), while a statistically significant increase in arthrofibrosis was found in patients with BMI <25 kg/m2. [22] (10.1016/j.jisako.2025.100927)
• [L3] Obesity has an increased risk of all-cause revisions and revision for instability or dislocation in patients receiving rTSA indicated for fractures. [23] (10.1016/j.jse.2025.05.036)
• [L3] In morbidly obese patients, DM implants demonstrated excellent five-year survivorship with outcomes comparable or slightly superior to fixed-bearing constructs. [24] (10.1016/j.arth.2026.03.075)
• [L3] Hip arthroscopy for the treatment of FAI and labral tears in patients with obesity yielded significant and sustainable long-term improvements, which were equivalent to those of a benchmark matched control group of normal-weight patients. [25] (10.1177/03635465251392585)
• [L1] Total weight loss % was higher in bariatric surgery patients (28.7%, P < 0.001). [26] (10.1016/j.arth.2026.05.033)
• [L1] Additionally, women with HIIT training had significant reduction in their weight and BMI compared to those who followed MICT training protocol. [27] (10.1186/s12891-026-09722-z)
• [L3] The ten-year functional outcomes and revision rates of THA do not justify restricting access to surgery on the basis of BMI. [28] (10.1016/j.arth.2025.07.044)
• [L3] Based on AOANJRR data, obese patients are at increased risk of higher rate of revision following UKA. [31] (10.1177/2325967125s00336)

References¶

[1] The Role of Obesity in Pediatric Orthopedics. JAAOS: Global Research and Reviews. 2019. DOI: 10.5435/jaaosglobal-d-19-00036

[2] The association between body mass index and osteoporosis, with consideration of sex differences: a systematic review and dose-response meta-analysis. BMC Musculoskeletal Disorders. 2026. DOI: 10.1186/s12891-026-09675-3

[3] It is time to bust the myth of physical inactivity and obesity: you cannot outrun a bad diet. British Journal of Sports Medicine. 2015. DOI: 10.1136/bjsports-2015-094911

[4] Body Mass Index of 45 Is a Safe Cut-Off for Cementless Total Knee Arthroplasty. The Journal of Arthroplasty. 2025. DOI: 10.1016/j.arth.2025.12.038

[5] Reframing Obesity in Knee Osteoarthritis: A Call for a Transdisciplinary Approach Beyond Biomechanics. Arthroscopy. 2026. DOI: 10.1002/arj.70051

[6] Body Mass Index > 40 Is Not Correlated With Early Complications in Patients Undergoing Primary Total Joint Arthroplasty at an Ambulatory Surgical Center. The Journal of Arthroplasty. 2026. DOI: 10.1016/j.arth.2025.08.065

[7] Reply to: "Letter to the Editor Commenting on: 'Current Evidence Does Not Support the Use of Tibial Stem Extension in Total Knee Arthroplasty of Obese Patients: A Systematic Review'". The Journal of Arthroplasty. 2026. DOI: 10.1016/j.arth.2025.11.056

[8] Joint associations of device-measured physical activity and abdominal obesity with incident cardiovascular disease: a prospective cohort study. British Journal of Sports Medicine. 2023. DOI: 10.1136/bjsports-2023-107252

[9] Body mass index does not affect clinical outcomes following arthroscopically assisted posterior latissimus dorsi tendon transfer for irreparable posterosuperior rotator cuff tears: a minimum 5-year follow-up study. JSES Reviews, Reports, and Techniques. 2026. DOI: 10.1016/j.xrrt.2025.100634

[10] Obesity Severity and Stiffness After Total Knee Arthroplasty Revisited: A Contemporary Analysis of Patients Requiring Manipulation Under Anesthesia. The Journal of Arthroplasty. 2026. DOI: 10.1016/j.arth.2026.03.080

[11] Obesity and Total Knee Arthroplasty Revisited: Minimal Impact on Loosening and Mechanical Failure in the Modern Era. The Journal of Arthroplasty. 2026. DOI: 10.1016/j.arth.2026.04.031

[12] Exercise in the maintenance of weight loss: health benefits beyond lost weight on the scale. British Journal of Sports Medicine. 2021. DOI: 10.1136/bjsports-2021-104754

[13] Effect of exercise training on liver function in adults who are overweight or exhibit fatty liver disease: a systematic review and meta-analysis. British Journal of Sports Medicine. 2016. DOI: 10.1136/bjsports-2016-096197

[14] Impact of high body mass index on functionally aligned image-based robotic total knee arthroplasty: Comparable functional outcomes but higher mechanical failures. Journal of ISAKOS. 2025. DOI: 10.1016/j.jisako.2025.100861

[15] Obesity Class Does Not Associate With Incidence, Timing, or Invasiveness of Reoperations After Total Hip Arthroplasty. The Journal of Arthroplasty. 2026. DOI: 10.1016/j.arth.2025.07.026

[16] The Effect of Body Mass Index on Outcomes After Hip Arthroscopy for Femoroacetabular Impingement Syndrome: A Matched Analysis With 10-Year Follow-up. The American Journal of Sports Medicine. 2026. DOI: 10.1177/03635465251400355

[17] Is Semaglutide a Safer Weight-Management Option Than Bariatric Surgery for Patients Undergoing Total Hip Arthroplasty (THA)?. The Journal of Arthroplasty. 2026. DOI: 10.1016/j.arth.2025.08.068

[18] Disparities in Preoperative Weight Loss and Obesity Treatment Before Total Joint Arthroplasty. The Journal of Arthroplasty. 2026. DOI: 10.1016/j.arth.2026.06.021

[19] Soft Tissue-To-Bone Ratio Outperforms Body Mass Index in Predicting Periprosthetic Joint Infection in Total Knee Arthroplasty: A Retrospective Case-Control Study. The Journal of Arthroplasty. 2026. DOI: 10.1016/j.arth.2025.09.022

[20] Medial Meniscus Posterior Root Tear Repairs Show Osteoarthritis Progression Over Time With Higher Rates Seen With Higher Body Mass Index. Arthroscopy. 2026. DOI: 10.1002/arj.70028

[21] Body Mass Index is Not an Appropriate Proxy for the Condition of Peri-Incisional Adiposity in Primary Total Joint Arthroplasty Patients. The Journal of Arthroplasty. 2025. DOI: 10.1016/j.arth.2024.08.020

[22] Impact of body mass index on robotic-assisted total knee arthroplasty outcomes: A retrospective cohort analysis. Journal of ISAKOS. 2025. DOI: 10.1016/j.jisako.2025.100927

[23] Revision rates between obese and nonobese total shoulder arthroplasty patients: an Australian registry data study. Journal of Shoulder and Elbow Surgery. 2026. DOI: 10.1016/j.jse.2025.05.036

[24] Primary Total Hip Arthroplasty in Patients Who Have Morbid Obesity: A Propensity-Weighted Analysis of Dual Mobility and Standard Fixed-Bearing Implants. The Journal of Arthroplasty. 2026. DOI: 10.1016/j.arth.2026.03.075

[25] Obese Patients Treated by Hip Arthroscopy for Femoroacetabular Impingement Syndrome — 10-Year Functional Outcomes and Conversion Rates to Arthroplasty Compared With Normal-Weight Patients. The American Journal of Sports Medicine. 2026. DOI: 10.1177/03635465251392585

[26] Impact Of Prior Bariatric Surgery Versus Immediate Total Knee Arthroplasty On Knee Function Among Patients Who Have Severe Obesity And Advanced Knee Osteoarthritis: The SWIFT Trial. The Journal of Arthroplasty. 2026. DOI: 10.1016/j.arth.2026.05.033

[27] Impact of high-intensity interval training vs. moderate-intensity continuous training combined with strength training on physical and metabolic outcomes in post-bariatric surgery patients with sarcopenic obesity. BMC Musculoskeletal Disorders. 2026. DOI: 10.1186/s12891-026-09722-z

[28] Do the Ten-Year Functional Outcomes and Revision Rates of Total Hip Arthroplasty in Obese and Morbidly Obese Patients Justify Restricting Their Access to Surgery?. The Journal of Arthroplasty. 2026. DOI: 10.1016/j.arth.2025.07.044

[31] Obesity is Associated with Higher Rates of Revision Following Unicompartmental Knee Arthroplasty. Orthopaedic Journal of Sports Medicine. 2026. DOI: 10.1177/2325967125s00336