Medical-Surgical Nursing · Nursing Care of the Critically Ill Patient
Musculoskeletal Concerns
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In 30 seconds
Muscles, bones, and joints give the body shape, movement, and protection — but in the intensive care unit (ICU) they are put on idle. Sedation, mechanical ventilation, and enforced bed rest remove the everyday movement that keeps the musculoskeletal system healthy, and critical illness shifts the body into a state that breaks muscle down faster than it rebuilds. The result can outlast the original illness: profound weakness, stiff joints, muscle wasting, long-term loss of function.
This topic covers the musculoskeletal concerns of critical illness — ICU-acquired weakness, muscle wasting, contractures, the multisystem effects of immobility, and early mobility — plus the nursing habits that prevent complications and preserve function. The organizing idea: mobility is a treatment, not a luxury. The nurse who positions, moves, and mobilizes a critically ill person is delivering therapy, not just "activity."
Why this matters
- Muscle loss starts fast. Wasting can begin within days, and the weakness it causes is a major reason people struggle to come off the ventilator and recover after discharge.
- Immobility harms every system. Beyond muscles and joints, it raises the risk of blood clots, lung complications, pressure injuries, constipation, and delirium.
- Early mobility changes outcomes. Moving critically ill patients early and safely is associated with better recovery; it is now a standard goal in many ICUs, delivered by an interprofessional team.
The college version
Core Concepts
ICU-acquired weakness: when muscles "forget" how to work
ICU-acquired weakness (ICU-AW) Profound, symmetric muscle weakness developing during critical illness Full entry → is the umbrella term for profound, symmetric muscle weakness that develops during critical illness and cannot be explained by the original illness alone. It involves two overlapping processes: critical illness polyneuropathy (CIP) — nerve damage — and Critical illness myopathy (CIM) Muscle-fiber damage during critical illness Full entry → — muscle-fiber damage. Contributing factors include prolonged immobility, the catabolic state of critical illness, inflammation, sedation, and sometimes drugs used to paralyze muscles during ventilation. Specialists distinguish nerve from muscle damage; the nurse's job is recognition: a person who is awake but too weak to lift a limb against gravity, or who fails ventilator-weaning attempts despite improving lungs, may be developing ICU-AW.
The multisystem consequences of immobility
Bed rest is not neutral; it is a physiologic stressor. Walk through immobility system by system:
- Musculoskeletal: muscle atrophy (wasting), weakness, joint stiffness, and contractures — joints fixed in a shortened position from being held still too long; bones lose density too.
- Cardiovascular: blood pools in the legs, orthostatic intolerance develops (dizziness or blood-pressure drops on sitting up), and blood-clot risk (venous thromboembolism, VTE) rises.
- Respiratory: shallow breathing and poor secretion clearance raise the risk of atelectasis and pneumonia; weak respiratory muscles make ventilator weaning harder.
- Integumentary: pressure over bony areas leads to pressure injuries (see the Integumentary Concerns topic).
- Gastrointestinal: slowed motility contributes to constipation and feeding intolerance.
- Psychosocial: immobilization and sensory monotony contribute to delirium, anxiety, and depression.
Positioning and range of motion: the daily preservation work
While the person cannot move themselves, the nurse preserves joints and soft tissues: maintain joint alignment, reposition on a regular schedule per policy, and provide Passive range of motion The nurse moves the joint; the person's muscles do no work Full entry → (the nurse moves the joints through their full range) when the person cannot. As strength returns, progress to active-assistive (the person moves with help) and active range of motion (the person moves independently). Handle limbs gently around lines, drains, and painful areas, and stop if the person reports pain or shows distress.
Early mobility: moving as a team
Early mobility is getting critically ill patients moving as early and as safely as their condition allows, typically through a progression: bed exercises, sitting at the edge of the bed, sitting in a chair, standing, walking. It requires coordination — nursing, physical therapy, occupational therapy, and respiratory therapy often work together, with sedation adjusted and lines secured beforehand. Not every patient is a candidate: hemodynamic instability, unsafe oxygenation, and other contraindications may delay or limit mobility, and eligibility follows institutional protocol. When full mobility is not possible, smaller wins still count: repositioning, range of motion, and sitting up in bed all fight the same enemy.
Falls risk and the road back
Deconditioning does not end at ICU discharge: survivors often leave with weakness, fatigue, and a high falls risk, and full recovery can take months. Discharge planning should include rehabilitation services, home safety assessment, assistive devices (walkers, grab bars), and family teaching. The "rehabilitation mindset" starts in the ICU: set small, visible goals (sit up today, stand tomorrow), celebrate progress, and keep the person — not the disease — at the center. Person-first language matters: a person with ICU-acquired weakness, not "a weak patient."
Scope and the team
Positioning, range of motion, and protocol-guided mobility are nursing responsibilities; detailed strength testing and mobility prescriptions belong to physical and occupational therapists, whose scope is defined by state practice acts. The nurse mobilizes within orders and protocol, monitors tolerance, documents, and refers — never independently designing a therapy program.
Common Confusions
| Do not confuse | With | Difference |
|---|---|---|
| ICU-acquired weakness | Weakness from the admitting illness itself | ICU-AW is symmetric, diffuse, develops during critical illness; specialists rule out other causes first |
Eli explains
The same idea, in plain words
Explain it like I’m 10
When you stay in bed without moving for a long time, your muscles get weak, like a rubber band that never gets stretched — they shrink and stiffen. Very sick people can lose muscle strength surprisingly fast. Nurses move their arms and legs for them, help them sit up, and, as soon as it is safe, help them walk a little — moving early is one of the best ways to get strong again.
Worked example
A person with pneumonia has been on a ventilator for a week and is now awake and weaning. The nurse and physical therapist plan the first mobilization: they pause sedation per protocol, confirm vital signs and oxygenation are safe, secure lines and tubes, and gather enough help. They sit the person at the edge of the bed; the person feels dizzy, so they pause, let the blood pressure settle, and proceed cautiously to standing. The session lasts a few minutes; the person returns to bed tired but intact, and the nurse documents tolerance — vital signs, symptoms, distance, assistance needed. Tomorrow: a few steps to the chair. What made this safe was the team and the checklist — eligibility screening, line security, enough personnel, a stop rule. What made it therapy was the plan: a small, documented, repeatable step toward standing and walking. The nurse did not design the mobility prescription alone — that was shared with the therapist per scope — but the nurse's positioning, monitoring, and encouragement made it happen.
Key takeaways
- ICU-acquired weakness (CIP/CIM) is a major cause of prolonged ventilator dependence and long-term disability; recognize symmetric weakness that outlasts the original illness.
- Early, safe mobility is a team sport — nursing, PT/OT, respiratory therapy — with eligibility per protocol; not every patient can be mobilized.
- Passive range of motion and regular positioning prevent contractures and preserve joints while the person cannot move.
- Deconditioning outlasts the ICU stay: plan rehabilitation, falls prevention, and home safety before discharge.
Check yourself
6 review questions from the chapter. Try each one, then open the answer.
What is ICU-acquired weakness, and why does it matter for ventilator weaning?
Show answer
ICU-AW is profound, symmetric muscle weakness developing during critical illness (via nerve damage, CIP, and/or muscle damage, CIM). Weak respiratory muscles and general weakness make ventilator weaning and recovery slower and harder.
Name four body systems affected by immobility and one consequence in each.
Show answer
Example set: musculoskeletal (atrophy, contractures), cardiovascular (orthostatic intolerance, clot risk), respiratory (atelectasis, pneumonia risk), integumentary (pressure injuries), gastrointestinal (constipation), psychosocial (delirium).
What is the difference between passive and active range of motion, and when is each used?
Show answer
Passive ROM = the nurse moves the joint (used when the person cannot move); active ROM = the person moves the joint themselves (used as strength returns). Progression: passive → active-assistive → active.
Why is early mobility called a "team sport" in the ICU?
Show answer
Safe mobility requires coordinated roles — nursing, PT/OT, and respiratory therapy — plus sedation adjustment, line security, and eligibility screening per protocol.
What are contractures, and how does nursing prevent them?
Show answer
Contractures are joints fixed in a shortened position from prolonged immobility. Prevention is regular repositioning, joint alignment, and range-of-motion exercises.
Why must discharge planning for an ICU survivor include falls prevention and rehabilitation?
Show answer
Deconditioning and weakness persist after ICU discharge, raising falls risk and delaying recovery; rehabilitation, assistive devices, home safety assessment, and family teaching are part of safe transition.
Study tools & related lessonsKey vocabulary · Related
Key vocabulary
- ICU-acquired weakness (ICU-AW)
- Profound, symmetric muscle weakness developing during critical illness
- Critical illness myopathy (CIM)
- Muscle-fiber damage during critical illness
- Contracture
- A joint fixed in a shortened position from prolonged immobility
- Passive range of motion
- The nurse moves the joint; the person's muscles do no work
Sources & references
This lesson was adapted from the open educational references above; their licenses and attributions are preserved. See Copyright & Licensing.
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