Time Since Lower-Limb Amputation: An Important Consideration in Mobility Outcomes

The effect of exercise interventions on gait outcomes in subacute and chronic rehabilitation from lower-limb amputation: A systematic review and meta-analysis

Successful walking is a substantial contributor to quality of life in people with lower-limb amputation (PLLA), yet gait difficulties are common. Evidence-based exercise guidelines are necessary for PLLA with different clinical characteristics and at different phases of recovery. To systematically review the literature evaluating effects of exercise interventions on gait outcomes in PLLA at subacute and chronic stages of recovery. Databases MEDLINE, EMBASE, CINAHL, SPORTDiscus, Scopus, and the Cochrane Library were searched (inception to May 10, 2022). Inclusion criteria: randomized controlled trials assessing gait outcomes following exercise intervention; subjects were PLLA ≥18 years of age and used a prosthesis for walking. Meta-analysis using random effects with inverse variance to generate standardized mean differences (SMDs) was completed for primary gait outcomes. Subgroup analysis was conducted for the recovery phase (i.e., subacute and chronic) and level of amputation (e.g., transfemoral and transtibial). Of 16 included articles, 4 studies examined the subacute phase of recovery, whereas 12 examined the chronic phase. Subacute interventions were 30 minutes, 1-7 times/week, for 2-12 weeks. Chronic interventions were 15-60-minutes, 2-3 times/week, for 4-16 weeks. Low-moderate level evidence was shown for a small improvement in the subacute phase (SMD = 0.42, 95% confidence interval [0.06-0.79], I 2 = 46.0%) and a moderate improvement in the chronic phase (SMD = 0.67, 95% confidence interval [0.40-0.94], I 2 = 0.0%) in favor of exercise intervention groups. Multicomponent exercise programs consisting of gait, balance, and strength training are effective at improving gait outcomes in PLLA at subacute and chronic phases of recovery. The optimal duration and frequency of exercise is unclear because of variation between interventions, highlighting an area for future work.

Functional Mobility in Individuals With Lower Limb Amputation: An Observational Study

INTRODUCTION

Amputation leads to a permanent disability and brings a dramatic change in the life and function of the individual, more so in individuals with lower limb amputation. A lower limb amputation reduces mobility and can make persons dependent on assistive devices like crutches or a wheelchair. Restoring mobility and optimal physical functioning of an individual with lower limb amputation is the most important rehabilitation goal. There are very few studies that have quantified mobility deficits with valid outcome measures, especially in the Indian population. Our study aims to quantify the mobility deficit in individuals with lower limb amputation and add to the scant literature available on mobility values in the Indian population.

METHODS

This was a cross-sectional study. Individuals with lower limb amputation who attended an orthotic and prosthetic clinic in Vadodara city were recruited for the study. Those individuals who were above 18 years of age and had undergone either unilateral or bilateral amputation, at least six weeks prior to assessment, were included in the study. Those individuals who had total impairment of vision and hearing, cognitive impairment, upper limb amputation, and ankle and foot amputation were excluded from the study. Functional mobility was assessed with the prosthesis worn, using the Timed "Up and Go" (TUG) test.

RESULTS

There was a total of 54 individuals with lower limb amputation, 47 males and seven females. The mean age was 47.38±18.83 years. Transtibial (66.67%) was the most common amputation followed by transfemoral (27.8%). The mean TUG score for the total population was 20.19 ± 11.95 sec, for unilateral transfemoral amputation 20.26 ± 12.06 sec, and for unilateral transtibial amputation 20.01 ± 12.31 sec. There was a statistically significant direct relation of the TUG score with age (p=0.02), level of amputation (p<0.01), and length of time prosthesis was used (in years) (p=0.02) and a statistically significant inverse relation of TUG score with the cause of amputation (traumatic, p=0.02, non-traumatic, p=0.03), assistive devices used for mobility (p<0.01), and number of hours the prosthesis was worn in a day (p<0.01). There was a significant negative correlation between the duration of amputation and TUG score (r=-0.282, p<0.05) Conclusion: The functional mobility was reduced in individuals with lower limb amputation. There was a statistically significant direct relation of functional mobility with age, cause of amputation, level of amputation, and length of time of prosthesis used, and a statistically significant inverse relation with the number of hours of use of prosthesis in a day and assistive devices used. Individuals who were old, had a non-traumatic amputation, a higher level of amputation, those wearing a prosthesis for a short duration since amputation, who wore the prosthesis for a shorter duration during the day, and who used assistive devices for ambulation in addition to a prosthesis had longer TUG times. As the duration of amputation increased, the time taken for TUG decreased.

Adults with lower-limb amputation: Reduced multifidi muscle activity and extensor muscle endurance is associated with worse physical performance

Trunk muscles may be an overlooked region of deficits following lower-limb amputation (LLA). This study sought to determine the extent that trunk muscle deficits are associated with physical function following amputation. Sedentary adults with a unilateral transtibial- (n = 25) or transfemoral-level (n = 14) amputation were recruited for this cross-sectional research study. Participants underwent a clinical examination that included ultrasound imaging of the lumbar multifidi muscles, the modified Biering-Sorensen Endurance Test (mBSET), and performance-based measures, that is, the Timed Up and Go (TUG), Berg Balance Scale (BBS), and 10-m Walk Test (10mWT). Associations between trunk muscle metrics and performance were explored with regression modeling, while considering covariates known to impact performance postamputation (p ≤ 0.100). Average ultrasound-obtained, lumbar multifidi activity was 14% and 16% for transfemoral- and transtibial-level amputations, respectively, while extensor endurance was 37.34 and 12.61 s, respectively. For TUG, nonamputated-side multifidi activity and an interaction term (level x non-amputated-side multifidi activity) explained 9.4% and 6.2% of the total variance, respectively. For 10mWT, beyond covariates, non-amputated-side multifidi activity and the interaction term explained 6.1% and 5.8% of the total variance, respectively. For TUG, extensor endurance and an interaction term (level x mBSET) explained 11.9% and 8.3% of the total variance beyond covariates; for BBS and 10mWT, extensor endurance explained 11.2% and 17.2% of the total variance, respectively. Findings highlight deficits in lumbar multifidi activity and extensor muscle endurance among sedentary adults with a LLA; reduced muscle activity and endurance may be important factors to target during rehabilitation to enhance mobility-related outcomes.

Risk Factors for Underreporting of Life-Limiting Comorbidity Among Adults With Lower-Limb Loss

Peripheral neuropathy (PN) and peripheral arterial disease (PAD) are life-limiting comorbidities among adults with lower-limb loss that may not be adequately addressed in current care models. The objective of this study was to evaluate underreporting of PN and PAD among adults with lower-limb loss. We conducted a secondary analysis of a cross-sectional dataset of community-dwelling adults with unilateral lower-limb loss seen in an outpatient Limb Loss Clinic (n = 196; mean age = 56.7 ± 14.4 years; 73.5% male). Individuals participated in standardized clinical examinations including Semmes-Weinstein monofilament testing to assess for PN and pedal pulse palpation to assess for PAD. Bivariate regression was performed to identify key variables for subsequent stepwise logistic regression to discern risk factors. Clinical examination results indicated 16.8% (n = 33) of participants had suspected PN alone, 15.8% (n = 31) had suspected PAD alone, and 23.0% (n = 45) had suspected PN and PAD. More than half of participants with clinical examination findings of PN or PAD failed to self-report the condition (57.7% and 86.8%, respectively). Among adults with lower-limb loss with suspected PN, participants with dysvascular amputations were at lower risk of underreporting (odds ratio [OR] = 0.2, 95% CI: 0.1-0.6). For those with suspected PAD, those who reported more medication prescriptions were at lower risk of underreporting (OR = 0.8, 95% CI: 0.7-1.0). Adults with lower-limb loss underreport PN and PAD per a medical history checklist, which may indicate underdiagnosis or lack of patient awareness. Routine assessment is highly recommended in this population and may be especially critical among individuals with non-dysvascular etiology.

Residual and sound limb hip strength distinguish between sedentary and nonsedentary adults with transtibial amputation

Following a transtibial amputation (TTA), physical activity has known benefits for health and quality of life. Adults post-TTA, however, demonstrate reduced physical activity, predisposing them to adverse health outcomes. Identifying adults at the risk of sedentarism post-TTA via commonly used, objective clinical measures may enhance clinical decisions, including prosthesis prescription. The study's purpose was to determine whether residual and sound limb hip strength distinguishes between sedentary and nonsedentary adults post-TTA. A secondary analysis of a cross-sectional dataset (n = 44) was conducted. Participant residual and sound limb hip flexion, extension, abduction and adduction strength were assessed via handheld dynamometry. Physical activity was monitored for 7 days and participants were classified as sedentary (<5000 steps/day; n = 13) or nonsedentary (≥5000 steps/day; n = 31). Receiver operating curves revealed that residual and sound limb hip extension, abduction and adduction strength distinguished between sedentary and nonsedentary adults post-TTA (P < 0.050). Preliminary cut-points for hip strength measures to classify adults at the risk of sedentarism were determined. A hip strength composite score (0-6) estimates a 2.2× increased odds of being sedentary with each additional hip strength deficit. Post-TTA, residual and sound limb hip strength can help identify adults at risk of sedentarism to aid clinical decision making, including prosthesis prescription.