Continuous passive motion (CPM) is a treatment that uses a device to continuously move a joint through a controlled range of motion after trauma or surgery. This helps increase range of motion over time and aids recovery by promoting synovial fluid movement and preventing scar tissue formation. CPM can be used after ligament repairs, fractures, joint replacements, and contractures. It provides benefits like early motion, reduced pain and swelling, and prevention of stiffness. While it has advantages, it also has risks like wound complications if not applied properly. CPM works best in the short-term for pain and swelling control but has no clear advantage over passive range of motion exercises in the long run.
2. Definition :
Continuous passive motion
(CPM) is a treatment method
that help in recovery of joints
immediately after trauma or
surgery.
3. CPM carried out by CPM device which
constantly move the joint through a
controlled ROM , the exact range is
dependent on the joint but in the most cases
the range of motion is increase over time.
4. - Mechanism of Action
Mechanism of action to aid joint recovery depend
on what surgery is performed.
1- movement of synovial fluid : to allow for
better diffusion of nutrients into damaged
cartilage and diffusion of blood and waste
products
2- another mechanism: is the prevention of
fibrous scar tissue formation in the joint, which
tend to decrease the ROM for joint.
5. CPM can be used clinically in post operative
rehabilitation and management:
1-after ligament repair or other intra-
articular surgery
2-internal fixation of fracture
3-joint manipulation for contractures
4-total joint replacement
Uses of CPM:
6. Clinical advantage of CPM
1- Providing early motion
2-achieving functional ROM
3-Aid in pain relief
4-improve general circulation
5-reduce edema
6-improve cartilage synovial fluid
7-retard (delay)muscular atrophy
8- stiffness
9- incidence of complication
10- reduce hospital stay
11-enhance wound healing
7. Disadvantages:
1- increased length of time spend in bed
limiting walking
2- considerable maintenance costs
3- Mismatching of the units due to different
leg sizes- shape
4- CPM affected only the ROM and swelling
not muscular activity or power
8. Contraindication:
1- Unstable Fractures
2- Loss Of Sensation
3- Un Controlled Or Untreated Infection
Precautions:
Patients Can Complain As Result Of :
1- Inability To Apply Machine Properly
2- Lack Of Training For Nursing Or Therapist Who
Might Render Use Of Device a Risk To The Patient
10. CPM materials and functions:
CPM device composed of 3 major parts:
-Limb carrier
- the motor
- the controls
there are 3 variables to each subject:
1- the size of motion arc
2-the position of the motion arc in
relationship to normal arc of the joint
3-the rate of motion
11. Characteristics of CPM unit:
1- the device should fit anatomy to be moved as
closely as possible
2-the axis and the quantity of motion should be as
close as possible to patients (the repaired joint and
perpendicular structures will then be protected
from adverse stress)
3-the device should be adjustable in order to
increase or decrease the ROM within the
comfortable levels of the patient
12. 4- the machine must be designed to resist
fatigue during operation in the device
5- the device must be easy to control easily
turned off and on by patients and easily
adjusted by physician.
6- the device should be portable
13. Application
1- therapist application of CPM device should be
within 72 hours following surgery.
2- the device itself supports the limb and slowly
move the joint without patient assistance and move
through 24 hours.
3- application of device is continued from 1- 4 weeks.
16. Evidence base
Recent studies compare between long tem goal and
short term goal in using PROM and CPM:
Studies observe that CPM most effective than
PROM in short term goal ( pain , swelling, and
start move early)
But no difference between PROM and CPM in long
term goal