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Musculoskeletal

Sarcopenia and Frailty

Sarcopenia is muscle failure characterised by low strength, while frailty is reduced reserve across several systems that makes a person vulnerable to disproportionate decline after a minor stressor; they commonly coexist but require different assessments.

In a nutshell

Frailty is reduced multisystem reserve, so a minor stressor can cause disproportionate decline; sarcopenia is muscle failure in which low strength comes first. Establish usual baseline, look for acute illness and reversible causes, then use comprehensive geriatric assessment with goal-led strength and balance activity, nutrition, falls prevention, medication review and coordinated follow-up.

Classic presentation

An older person who becomes delirious, falls, stops walking or loses independence after a minor infection or medication change, often with reduced grip strength, poor appetite or weight loss.

Key points

  • Frailty is vulnerability from reduced reserve, not a synonym for age and not a reason to withhold treatment.
  • Score usual function before acute illness where possible; a Clinical Frailty Scale score does not replace clinical judgement or a search for acute disease.
  • Sarcopenia is probable with low muscle strength, confirmed by low muscle quantity or quality, and severe when physical performance is also poor.
  • Comprehensive geriatric assessment covers medical, functional, psychological, social and environmental needs and produces one coordinated plan.
  • Strength, balance and functional activity should be tailored and progressed; frailty or falls risk may require supervised exercise.
  • Screen and treat malnutrition, review medicines and address falls, cognition, mood, continence, housing, carers and future wishes.
  • Rapid weight loss, dysphagia, delirium, syncope, injury or rapid decline needs assessment for a specific acute or reversible cause.

First-line investigation

Establish usual function and frailty severity, assess acute illness, then perform a multidomain assessment with strength or chair-stand testing, nutrition and falls review, and targeted tests for reversible contributors.

Management

Find acute illness and immediate hazards

  • Assess acute confusion, infection, hypoxia, hypotension, dehydration, metabolic disturbance, injury, stroke, cardiac disease and medicine toxicity before attributing decline to frailty.4,10

Establish baseline and complete CGA

  • Record usual function and use a validated frailty tool as an adjunct, then coordinate comprehensive medical, functional, psychological, social and environmental assessment.1,3,4

Build strength, balance and function

  • Use tailored resistance, balance and functional activity, starting with safe sit-to-stand, walking and balance work and progressing with supervision when needed.7,10

Optimise nutrition and medicines

  • Screen for malnutrition and swallowing problems, provide appropriate nutrition support, and reduce medicine-related falls, sedation, hypotension, hypoglycaemia or anticholinergic burden using current BNF guidance.8,9,11

Coordinate prevention, support and review

  • Address falls, home safety, cognition, mood, continence, carers and future wishes; set functional goals and review response, weight, falls, nutrition, medicines and care transitions.1,10,3

Exam traps

  • Do not score acute delirium or infection as the person's baseline frailty.
  • Do not diagnose sarcopenia from low muscle mass alone; low strength comes first in EWGSOP2.
  • Do not attribute rapid weight loss, dysphagia, syncope or focal symptoms to frailty without investigating a cause.
  • Do not prescribe bed rest as the default; adapt activity and involve rehabilitation early.
  • Do not apply single-disease targets or medicines without considering treatment burden, frailty and the person's goals.
  • A fall, immobility, delirium, incontinence or polypharmacy in an older person can be a trigger for comprehensive geriatric assessment.

Illustrations

Hand-grip dynamometry in sarcopenia assessmentHand-grip strength being measured with a calibrated dynamometer; low strength identifies probable sarcopenia before confirmation with muscle quantity or quality assessment.Marcy Sanchez, Wikimedia Commons · Public domain

Key sources

  1. British Geriatrics Society, Comprehensive Geriatric Assessment Hub (Current UK professional resource describing CGA as a multidimensional, multidisciplinary process with physical, psychological, functional, social and environmental domains and coordinated follow-up)
  2. British Geriatrics Society, Fit for Frailty: recognition and management of frailty (UK professional guidance on recognising frailty, comprehensive review, reversible causes, goal-oriented care, medication review and referral)Published 11 Jun 2014
  3. NICE QS136, Transition between inpatient hospital settings and community or care home settings: comprehensive geriatric assessment (NICE quality statement that complex older people with frailty syndromes such as falls, immobility, delirium, polypharmacy or incontinence should receive comprehensive geriatric assessment)Published 1 Dec 2016
  4. British Geriatrics Society, Silver Book II: Holistic assessment of older people (UK urgent-care resource for assessing older people living with frailty during the first 72 hours, including acute frailty syndromes and comprehensive assessment)Published 22 Feb 2021
  5. EWGSOP2, Sarcopenia: revised European consensus on definition and diagnosis (International consensus used because no dedicated current NICE sarcopenia guideline was found: low strength indicates probable sarcopenia, low muscle quantity or quality confirms it, and poor physical performance indicates severe sarcopenia)
  6. British Geriatrics Society, Sarcopenia research and practice (UK professional resource summarising the clinical importance, detection and exercise evidence for sarcopenia; it does not replace the EWGSOP2 diagnostic consensus)Published 3 May 2019
  7. UK Chief Medical Officers, UK physical activity guidelines (Current UK-wide guidance recommending daily activity for older adults and strength, balance and flexibility activity on at least 2 days each week, with supervised or adapted activity when frailty or falls risk requires it)Published 10 Jul 2026
  8. NICE CG32, Nutrition support for adults (NICE guideline on screening for malnutrition, MUST as an example tool, oral nutrition support, swallowing safety, refeeding risk and monitoring; published 22 February 2006 and last updated 4 August 2017)Published 22 Feb 2006 | Updated 4 Aug 2017
  9. NICE NG56, Multimorbidity: clinical assessment and management (NICE guidance on treatment burden, shared decisions, medicine-related safety concerns and comprehensive assessment in older people with complex needs)
  10. NICE NG249, Falls: assessment and prevention in older people and people 50 and over at higher risk (Current NICE falls recommendations covering multifactorial assessment, strength and balance exercise, medication review and prevention planning)
  11. BNF, current prescribing information for older people with frailty (Current UK prescribing source to check indication, interactions, adverse effects, renal adjustment and deprescribing decisions; direct access was restricted and the browser session was unavailable, so no unsupported doses were included)

This page is exam revision material, not medical advice, and must not be used for patient care. Always check drug doses against the BNF and current guidance. Full disclaimer.