The Ultimate Guide to CPM Machines
Read this guide and you will know which CPM machine fits your joint, setting, and recovery needs before you buy.
- Joint stillness closes the window: After surgery or injury, scar tissue and fluid buildup move fast, and the window for restoring full range of motion closes sooner than most people expect.
- What separates a useful machine from one that just moves a limb is how precisely it holds its settings over a long session and how well its geometry matches your joint.
- Confirm your protocol range first: Before ordering any unit, have your prescribed flexion and extension angles in hand and confirm the machine covers that full range with room to spare.
- Axis alignment before first cycle: Even slight off-center positioning causes discomfort before it causes any benefit, so take five minutes to match the machine's axis to your joint before running a single cycle.
- A history of deep vein thrombosis, peripheral vascular disease, or skin integrity problems around the joint should be discussed with your physician before the first session.
- Skin oils, sweat, and topical medications degrade the padded cradle over time, and cross-contamination is a real concern if the machine is used by more than one person.
What it is and who it is for
A CPM machine, short for continuous passive motion machine, is a motorized rehabilitation device that moves a joint through a controlled arc of motion without asking your muscles to do any of the work. You rest. The machine bends and straightens the joint repeatedly, holding it within whatever range your clinician has prescribed, for however long each session runs. That is the entire concept, and it is simpler than most people expect before they first encounter one.
The Problem It Solves
After joint surgery, the body's instinct is to protect the area by limiting movement. That protection quickly becomes a problem. Tissue starts to stiffen, scar tissue forms, and restoring a full range of motion can take months of painful physical therapy work if nothing intervenes early. The OptiFlex K1 listing puts it plainly: if a patient fails to move a joint after surgery, stiffness and scar formation are the predictable result. CPM machines address that by keeping the joint moving in the hours and days when you physically cannot do it yourself, and when the discomfort of active exercise would make compliance nearly impossible.
The motion is passive because you are not contracting muscles to produce it. That distinction matters clinically: passive motion puts very different stress on healing tissue than active exercise does, which is why surgeons sometimes prescribe CPM use in the early postoperative window and then transition patients into active therapy as healing progresses. The two approaches work together rather than substituting for each other.
Who Actually Uses One
The largest group by far is people recovering from knee surgery, including total knee replacement, ACL reconstruction, and other procedures that leave the joint temporarily unable to tolerate active exercise. Many of them use a machine at home in the days following discharge, following a schedule set by their surgical team. If you are researching CPM machines in that situation, the section on recovering after knee surgery covers what the typical protocol looks like.
Beyond knee patients, elbow and shoulder CPM machines serve a smaller but real population of people recovering from procedures on those joints. The Kinetec Centura Bed/Wheelchair Shoulder CPM and the Kinetec Centura CEM Elbow CPM exist specifically for those applications, with range-of-motion specs and positioning designed around each joint's anatomy rather than adapted from a knee unit. Clinics and physical therapy facilities also purchase CPM equipment to serve multiple patients across a device's lifespan, which is part of why the machines are built to the tolerances they are.
Athletes dealing with joint injuries occasionally use CPM machines as part of a supervised recovery plan, though this is less common outside a clinical setting. The equipment is not fitness gear, it is rehabilitation equipment, and it works within a framework that includes medical oversight.
What It Is Not
A CPM machine is not a replacement for physical therapy. It does not strengthen muscles, improve balance, or train the neuromuscular patterns you need to walk, throw, or lift. It addresses one specific early-recovery problem: keeping a joint mobile while tissue is too fragile or painful to tolerate active movement. Once you are through that window, active rehabilitation takes over as the primary tool.
It is also not exercise equipment in any meaningful sense. The passive nature of the motion means your cardiovascular system and muscles are essentially uninvolved. Comparing a CPM machine to a stationary bike or a resistance band routine misses what the device actually does.
Where It Sits Relative to the Alternatives
Most people considering a CPM machine are choosing between buying one outright and renting for the duration of their recovery. Price points across the machines available here range from roughly $3,800 to over $7,600, and the rental versus buying question depends on how long you expect to use the device and whether it might serve someone else in the household down the line. That decision gets its own section in this guide.
The sections ahead cover how the mechanism actually works, how to choose the right type of machine for your joint and situation, what the evidence says about the benefits, how to use a machine correctly, what to look for before you buy, and what ongoing maintenance looks like. By the end, you should have enough to make a confident decision without needing to piece together information from a dozen different sources.
How it works
The mechanism is straightforward in principle: a motor drives a series of linkages that carry your limb through a set arc, reversing direction at each end without any effort from you. What separates a machine that produces real recovery results from one that just moves a joint back and forth is how precisely it executes that motion, how consistently it holds its settings over a long session, and how well the geometry of the device matches the geometry of your joint.
The Drive Cycle
A CPM machine moves through two phases: flexion, where the joint bends, and extension, where it straightens. The motor runs continuously in one direction until the limb reaches the set endpoint, then reverses. Speed is measured in cycles per minute, and most knee units operate at a slow, deliberate pace, typically somewhere between one and three cycles per minute during active rehabilitation. Going faster is not better. The goal is to encourage synovial fluid movement and tissue remodeling, both of which need time at the end ranges of each cycle to happen properly.
The range of motion is set by the clinician or care team and changes as recovery progresses. A patient coming out of knee replacement surgery might start at ten to thirty degrees and work outward in small increments over the following days, aiming for ninety degrees or beyond as swelling permits. The machine holds the endpoints precisely, which matters because overshooting even slightly in the early days can cause pain that interrupts therapy.
What the Motor and Frame Actually Do
The motor has to apply consistent torque throughout the arc, even as the mechanical advantage shifts when the joint angle changes. A well-designed drive train maintains smooth, even force through the full cycle. If the mechanism is sloppy, the limb can jerk at the reversal points, which is uncomfortable and can provoke protective muscle tension that undermines the passive nature of the therapy. That smoothness is one of the things that distinguishes a purpose-built rehabilitation device from a lower-tier alternative.
Frame weight has practical implications too. The OptiFlex K1 weighs just 23 pounds, which makes it genuinely manageable for someone recovering at home, either for repositioning on the bed or for a caregiver handling setup. Heavier units are not necessarily worse, but the trade-off is real. A more substantial frame often correlates with a more rigid drive train, which some clinicians prefer for patients who need firm positional control during the early postoperative period.
The Specifications That Actually Drive Results
Three numbers matter most when evaluating whether a machine will do what you need it to do. First is the maximum range of motion, which needs to comfortably exceed your recovery target so you are never limited by the device rather than by the tissue. Second is the extension limit: many patients need the machine to hold full extension, or close to it, which requires accurate calibration at the low end of the arc, not just the high end. Third is speed range. A machine with only one or two speed settings gives you less flexibility as the rehabilitation protocol changes week to week. Units across the category vary in how granular these adjustments can be, and that variability shows up in what determines the price more than almost any other single factor.
Types of CPM machines and how to choose
CPM machines are not a one-size category. The joint being treated, the setting where you'll use the device, and how long you expect to need it all push you toward different designs. Knowing the main types before you browse saves a lot of backtracking.
Knee CPM Machines
Knee units make up the majority of what most people are looking for, and for good reason: total knee replacement is one of the most common orthopedic surgeries performed, and CPM therapy has been a standard part of the post-operative protocol for decades. A knee CPM cradles the lower leg from heel to thigh, flexing and extending the knee through a prescribed arc. Most models in this category adjust for leg length and include a foot plate with a strap to keep the limb from sliding. If your surgeon has recommended CPM therapy after a knee procedure, this is almost certainly the type they had in mind.
If portability matters to you, pay attention to unit weight. The OptiFlex K1 tips the scale at just 23 lbs, which makes it genuinely easy to move between a bed and a recliner without help, a practical detail that gets overlooked until you actually need to reposition the device several times a day.
Shoulder CPM Machines
Shoulder units work differently from knee CPMs because the shoulder joint moves in multiple planes. These machines typically mount to a chair or a dedicated base and move the arm through elevation and, on some models, rotation. They are most commonly used after rotator cuff repair or shoulder replacement. Setup takes more care than a knee unit because correct arm positioning relative to the joint center matters more. If a shoulder CPM is on your radar, the buying considerations deserve their own attention, which is covered in our article on shoulder CPM features and fit.
Elbow, Ankle, and Hand CPM Machines
These are the less common but genuinely important applications. Elbow CPMs are used after fracture repair or joint replacement and flex the forearm through extension. Ankle units are particularly useful following ligament reconstruction or ankle fusion procedures. Hand and wrist CPMs are smaller, often glove-style designs, and target the smaller joints that conventional CPM frames cannot reach. The clinical use cases for each are specific, and these devices are almost always prescribed rather than self-selected.
Comparing the Types
| Model | Best for | Key trade-off |
|---|---|---|
 |
Knee recovery where portability and ease of repositioning matter | Lighter build favors convenience; confirm range specs match your surgeon's protocol |
 |
Post-op shoulder rehab requiring multi-plane motion | More complex setup; positioning must be verified by a clinician |
 |
Elbow fracture or replacement recovery | Narrower use case; not interchangeable with knee or shoulder units |
 |
Ankle ligament or fusion recovery | Fewer models available; confirm compatibility with your specific procedure |
 |
Small joint rehab after hand or wrist surgery | Typically the most specialized; prescription-driven selection |
The full range of units we carry is browsable in the CPM machines collection, where you can filter by joint and compare models side by side.
How to Actually Decide
Start with the joint. That choice is almost always made for you by your surgeon or physical therapist, so if you have a prescription or a discharge protocol, match the device to the joint it names. The cases where people go wrong are usually ones where they assume any CPM will do, or they borrow a knee unit for a shoulder application. These machines are joint-specific by design.
Once you know the joint, look at your space and your daily routine. A knee CPM is used lying down on a bed or in a recliner, often for multiple sessions per day in the early weeks after knee surgery. If you live in a small apartment or plan to move between rooms, a lighter unit is not a luxury, it is a real quality-of-life factor. Shoulder and elbow CPMs need a stable chair and a few feet of clearance; think about where that will realistically be in your home.
Budget is a factor, but it interacts with duration of use in ways that matter. Someone needing CPM therapy for three or four weeks has a different calculation than someone managing a chronic condition or recovering from a staged bilateral procedure. The rental versus purchase question is worth thinking through carefully before you commit either way. If you are buying rather than renting, features like a digital controller, finer range-of-motion increments, and a published weight rating become worth paying for because you will be living with the device long enough for those details to add up.
Finally, think about who operates it. Some patients manage the device entirely on their own. Others have a caregiver assisting with setup and adjustment. A unit with a straightforward hand control and clearly marked settings is easier for both. If your situation involves solo use during the day and assisted use in the evening, run through the setup sequence before you commit to a specific model.
Benefits and what the evidence says
The case for CPM therapy rests on a clear physiological rationale: joints deprived of movement after surgery develop scar tissue, lose synovial fluid circulation, and stiffen in ways that can take months of physical therapy to reverse. What the research actually shows, though, is more specific than the general principle suggests, and it's worth being precise about where the evidence is strong and where it's thinner.
Reducing Stiffness and Maintaining Early Range of Motion
The most consistent finding in CPM research is that early passive movement reduces the formation of intra-articular adhesions following joint surgery. When you use a CPM machine in the first days after a procedure, the repetitive motion stretches the joint capsule and surrounding soft tissue before fibrous scar tissue has had a chance to mature and contract. This is the core mechanism the OptiFlex K1 listing describes directly: without movement, tissue stiffens and scar tissue forms, producing a joint that needs months of corrective therapy to rehabilitate.
A Cochrane review on CPM after total knee arthroplasty found that early use produced modest improvements in short-term range of motion and reduced length of hospital stay, though the long-term differences compared to active exercise were less clear (Cochrane, 2014). That context is useful: CPM is most valuable in the acute phase, not as a substitute for the active rehabilitation that follows.
Pain and Swelling in the Acute Phase
Many patients and clinicians report that sessions on a CPM machine help manage postoperative pain and swelling, and there is a plausible mechanism for this. Passive movement promotes lymphatic and venous drainage, which reduces fluid accumulation around the joint. Some studies have found reductions in analgesic use among patients who used CPM early, though the effect size varies and results across trials are inconsistent enough that no strong consensus exists on this outcome alone.
What is clearer is that gentle movement appears to modulate pain perception through mechanoreceptor stimulation, a principle well established in musculoskeletal rehabilitation. The practical takeaway is that most patients find their sessions more comfortable than they expect, and those who report the least discomfort tend to be the ones whose machines were fitted and programmed correctly from the start. If you are managing pain alongside mobility goals, it's worth reading about what to expect after knee surgery to set realistic milestones.
Cartilage Health and Synovial Fluid Circulation
One of the more compelling arguments for CPM comes from basic science rather than clinical trials. Articular cartilage has no direct blood supply; it depends on the pumping action of joint movement to distribute synovial fluid and the nutrients it carries. Research in this area, including early foundational work by Salter et al. published in Clinical Orthopaedics and Related Research, 1984, demonstrated that continuous passive motion promoted cartilage regeneration in animal models more effectively than immobilization or intermittent active motion. Extrapolating directly from those findings to human clinical outcomes requires caution, but the underlying physiology has held up as a rationale.
Where the Evidence Is Thinner
It is fair to say that the enthusiasm for CPM in clinical guidelines has moderated over the past decade. Several randomized trials have found that for total knee replacement specifically, patients who received CPM alongside physiotherapy did not consistently achieve better long-term outcomes than those who received physiotherapy alone. The American Academy of Orthopaedic Surgeons has at various points described the evidence for routine CPM use as inconclusive for certain procedures. This does not mean CPM machines are ineffective; it means the benefit is most defensible in specific scenarios: complex reconstructions, patients at high risk for stiffness, procedures involving cartilage repair, and joints other than the knee where active motion is particularly difficult to achieve early.
Elbow and shoulder procedures are a good example. The mechanics of getting voluntary, pain-free motion in an operated shoulder or elbow are genuinely difficult in the first postoperative days. Devices like the Kinetec Centura Bed/Wheelchair Shoulder CPM and the Kinetec Centura elbow units serve a real function here precisely because active patient effort is so limited. The evidence for CPM in these joints, while less voluminous than for the knee, is generally more favorable because the comparator (patient-driven early motion) is harder to achieve reliably.
The Honest Summary
CPM machines are most defensible as an early-phase tool that buys time and tissue health while your body transitions toward active rehabilitation. They reduce the risk of adhesion formation, support synovial circulation, and make the early days after surgery more manageable for many patients. They are not a replacement for physiotherapy, and the evidence does not support expecting them to change long-term outcomes on their own. Your surgeon's protocol and the specific procedure you have had are the real determinants of how much you stand to gain, which is why the clinical rationale behind continuous passive motion is worth understanding before committing to a machine or a schedule.
How to use CPM machines
Knowing you need a CPM machine and actually using it well are two different things. The setup is not complicated, but the details matter, and the mistakes that slow recovery usually have nothing to do with the machine itself.
Getting Started: Your First Session
Before you run a single cycle, take five minutes to read through the manufacturer's positioning instructions for your specific model. The limb support angles, strap placement, and axis alignment vary between units, and a joint that sits even slightly off-center will cause discomfort before it causes any benefit. If your surgeon or physical therapist gave you a starting range of motion, write it down and set the machine to that number before your first session, not to whatever the previous user left it at.
Position the machine on a flat, stable surface
For a knee unit, a bed or a firm couch works. The machine needs to stay still during the session; anything that rocks or slides will shift your joint alignment mid-cycle. Lighter units help here: the OptiFlex K1, for example, weighs just 23 lbs, so repositioning it between sessions is not the ordeal it can be with heavier machines.
Set your starting range of motion
Use the exact figures from your post-operative instructions. For most knee replacements, that typically means starting somewhere in the range of 0 to 40 degrees of flexion. Do not be tempted to push further on day one because the movement feels easy. The tissue is still very early in healing.
Place and secure your limb
Align your joint axis with the machine's pivot point, then fasten any straps snugly but not tightly. Your foot and lower leg should feel supported, not gripped. Check that nothing is pressing on the incision site before you start the motor.
Set the speed to slow
Most units give you a speed control measured in cycles per minute. Start at the slowest available setting. A faster cycle feels like you're making faster progress; you are not. Slower cycles let you stay relaxed through the full arc, which is the whole point of passive motion.
Run your first session for 30 to 60 minutes
Stop if you feel sharp or burning pain. Mild aching at the end of the range is normal; anything that makes you tense your muscles against the movement is a signal to reduce the range and check your positioning.
Building a Sensible Progression
The general approach is to add range of motion gradually as comfort and swelling allow, typically in increments of 5 to 10 degrees every day or two, working toward the flexion goal your care team set for the first few weeks. What tends to go wrong is that people treat the machine's range limit as a daily challenge to beat rather than a recovery tool to use consistently. Progress that stalls for a few days is completely normal; progress that reverses because you pushed through pain is a problem worth a call to your surgeon.
Timing your sessions around your pain management schedule also makes a real difference. Using the machine when an analgesic is near its peak effect allows your muscles to stay genuinely relaxed throughout the arc. If your muscles are guarding, the motion is no longer truly passive, and you lose the core benefit. What recovery with a CPM machine looks like day by day is covered in more detail elsewhere in this guide.
How More Experienced Users Go Further
Once you are well into recovery and cleared for greater range, the focus shifts from raw degrees of flexion to the quality of motion throughout a longer arc. At this stage, small adjustments to limb position and speed become more relevant. Some people find that using the machine immediately after a physical therapy session, when soft tissue is already warmed and stretched, produces noticeably smoother motion at higher degrees of flexion.
Users managing a chronic condition rather than a surgical recovery often settle into a maintenance routine of one or two shorter sessions daily, prioritizing consistency over duration. The machine is most useful as a complement to active rehabilitation, not a replacement for it.
The Mistakes That Waste the Purchase
- Setting the range higher than prescribed because the movement feels comfortable. Early comfort does not mean the tissue is ready.
- Skipping sessions when swelling increases. Mild swelling is common and is not a reason to stop; worsening swelling after a session is a reason to call your care team.
- Running the machine at high speed throughout. Higher speed reduces the time your joint spends at end-range, which is where a lot of the benefit accumulates.
- Misaligning the joint axis. This is the single most common setup error and also the one most likely to cause soreness that gets blamed on the machine rather than the positioning.
- Stopping the machine the moment a goal degree is reached. The flexion target is a checkpoint, not the finish line. Maintenance sessions matter.
If you are still deciding between renting and buying before you commit to a setup routine, the rental versus buying decision has its own section in this guide and is worth reading before your procedure date if possible.
Safety and things to consider
Who Should Talk to a Doctor Before Starting
Most people using a CPM machine have already come through surgery and have a protocol handed to them by their care team. But there are situations where that conversation needs to happen before the first session, not just before the purchase. If you have a history of deep vein thrombosis, peripheral vascular disease, or skin integrity problems around the joint, flag those specifically with your physician. CPM applies repetitive mechanical force, and those conditions can change how the tissue responds.
People managing osteoporosis should confirm that the bones around the treated joint are stable enough to tolerate the load. This is not a common contraindication, but it is a real one. Similarly, anyone whose wound has not yet closed, or who is using a CPM for a joint other than the knee, such as an ankle or elbow application, should verify the protocol in writing because non-knee CPM is less routinely prescribed and the margins for error are narrower.
Setting the Machine Up Safely
The single most common safety mistake is starting at too aggressive a range of motion. Your physician or therapist will typically give you a starting angle and a daily or weekly progression schedule. Treat that schedule as a ceiling, not a floor. Pushing the arc wider than prescribed does not speed recovery; it stresses tissue that is not ready for it.
Limb positioning matters more than most people realize. The joint should be seated in the device's cradle the way the manual shows, with the machine's pivot point aligned with the anatomical joint line. A misaligned setup creates shear forces the machine was not designed to produce. The OptiFlex K1, for instance, is notably light at 23 lbs, which makes repositioning easy, but that convenience should be used to dial in correct alignment, not to rush through setup.
Run the device on a stable surface with the power cord routed where you will not catch it if you shift position. Keep the hand control within reach at all times so you can stop the machine immediately if something feels wrong.
Warning Signs That Mean Stop Now
Some discomfort during early sessions is expected, particularly a sense of stretch at the end of the range. Sharp pain is not. If you feel a sudden, acute pain at any point in the cycle, stop the machine and do not restart it until you have spoken with your care team. The same applies to any new swelling that appears during or immediately after a session, warmth that was not there before, or numbness and tingling in the limb distal to the joint.
- Sharp or shooting pain at any point in the motion arc
- Sudden increase in joint swelling during or after a session
- Wound reopening, drainage, or bleeding around the surgical site
- Numbness, tingling, or loss of sensation in the limb
- Skin breakdown or pressure sores under the padded supports
- Any mechanical grinding, jerking, or uneven motion from the device itself
If the machine itself is behaving erratically, a jerk, a stall mid-cycle, or a grinding sound, stop use and contact us before the next session. Using a malfunctioning unit is a safety issue, not just a mechanical inconvenience.
Keeping the Machine Safe to Use
The maintenance section of this guide covers cleaning and upkeep in detail, but from a safety standpoint the two things that matter most are pad condition and connection integrity. Inspect the foam and fabric supports before every session. Deteriorating padding does not just reduce comfort; it changes how load is distributed across the limb and can create pressure points over bony prominences. Check that all cable connections are secure and that the hand control responds correctly before you begin each cycle.
Where to start with cpm machines
OptiFlex K1 Knee CPM Machine with Standard Hand Control
Kinetec Spectra Essential Knee CPM Machine
Kinetec Spectra Knee CPM Machine
Kinetec Centura CEM Elbow CPM Machine
Kinetec 6080 Elbow Continuous Passive Motion (CPM) Machine
Kinetec Centura Bed/Wheelchair Shoulder CPM Machine
Kinetec Maestra Hand and Wrist CPM Machine
Kinetec Breva Ankle Continuous Passive Motion (CPM) Machine
Frequently asked questions
Who is a CPM machine actually designed for?▾
CPM machines are built for people recovering from joint surgery or a serious joint injury, most often a knee replacement, though units exist for shoulders, ankles, and other joints. The core idea is that a joint kept still after surgery stiffens quickly as scar tissue forms and fluid accumulates, so the machine moves the limb passively while your muscles rest completely. Most users come to a CPM machine with a protocol already written by their surgeon or physical therapist.
Is it safe to use a CPM machine at home without supervision?▾
For most post-surgical patients who have a written protocol from their care team, home use is straightforward and well within the intended design of the device. However, anyone with a history of deep vein thrombosis, peripheral vascular disease, or other circulatory concerns should have a specific conversation with their doctor before starting, not just before buying. The machine is a rehabilitation aid, not a treatment, and adjusting range-of-motion settings or session duration on your own, outside the prescribed protocol, is where home use can become a problem.
How much should I expect to spend on a CPM machine?▾
No specific price figure is available from the manufacturer data for this category, so quoting a range here would not be reliable. What is worth knowing is that there is a meaningful difference between entry-level units and more clinically robust models, mainly in how precisely they hold their settings over a long session and how well the device geometry matches your joint. Having your prescribed protocol in hand before you shop makes it much easier to identify which tier of machine actually meets your clinical needs.
How do I set up a CPM machine correctly before my first session?▾
Before running a single cycle, read through the manufacturer's positioning instructions for your specific model, because limb support angles, strap placement, and axis alignment vary between units. A joint that sits even slightly off-center will cause discomfort well before it causes any benefit, so take five minutes to get the positioning right rather than assuming it is intuitive. If your surgeon or physical therapist gave you specific setup guidance, that takes priority over the general instructions.
What does it cost to run a CPM machine day to day?▾
The ongoing demands are genuinely modest, but a few costs are worth factoring in before you commit. The most consistent task is cleaning the padded limb cradle after every session to remove skin oils, sweat, and any residue from topical medications or wound dressings, which most manufacturers specify using a mild solution rather than anything abrasive. If the machine is shared between users, that cleaning step becomes more critical, not just for material preservation but for basic hygiene.
How do I maintain a CPM machine so it keeps working reliably?▾
Routine cleaning after each session is the main ongoing task, and doing it consistently prevents both material degradation and contamination. Beyond that, the mechanical demands of a well-built unit are low, but you should periodically check that the padded supports and straps have not worn to the point where positioning becomes imprecise, since joint alignment is what separates a productive session from a frustrating one. Following the manufacturer's maintenance guidance rather than improvising with harsh cleaners or lubricants is the practical rule.
How do I know which size or type of CPM machine fits my situation?▾
The joint being treated is the first filter: knee units are the most common by far, but shoulder, ankle, and other joint-specific designs exist and are not interchangeable. For knee units specifically, the two numbers that matter most are minimum extension and maximum flexion, and a machine that cannot reach the angles your surgeon prescribed simply cannot do the job regardless of how well it is built in other respects. Have your protocol in hand before you look at any specific model, because matching those prescribed angles is the only reliable way to size the purchase correctly.
What is the most common mistake people make when using CPM machines?▾
The most common problem has almost nothing to do with the machine itself: it is poor initial positioning. A limb placed even slightly off the intended axis creates discomfort during the session and can limit the benefit of motion that would otherwise be therapeutic. The second mistake is adjusting settings, especially range of motion or speed, without consulting the prescribing clinician, which can stress tissue that is not ready for a greater arc and set recovery back rather than advancing it.
- Cochrane, 2014. cochrane.org
- Clinical Orthopaedics and Related Research, 1984. pubmed.ncbi.nlm.nih.gov
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