Range of Motion Exercises
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Direct answer
Range of motion exercises come in three grades — passive, active-assisted and active — decided by how much of the arc the patient can generate. In passive ROM the therapist or a machine moves the joint while the patient stays relaxed; in active-assisted ROM patient and therapist share the work; in active ROM the patient moves unaided. Passive movement maintains joint integrity, cartilage nutrition and soft-tissue extensibility when the patient cannot move; only active movement builds strength, endurance and motor control. Prescription therefore depends on the stage of healing, the patient's muscle grade and whether the goal is maintenance, recovery or functional use.
What you must remember
- Passive ROM needs no voluntary contraction: it maintains extensibility, prevents adhesions, spreads synovial fluid over cartilage and retains movement when volition or consciousness is absent — but it never strengthens or builds endurance, a recurring MCQ point.
- Active-assisted ROM suits muscles graded around 2/5 or movements limited by pain; classic tools include the powder board, overhead pulley and finger ladder for the shoulder.
- Active ROM requires roughly grade 3 control and adds sensory feedback, circulation, muscle pump action and motor re-education.
- Osteokinematics describes physiological movements (flexion–extension, abduction–adduction, rotation); arthrokinematics describes accessory roll, spin and glide — the therapist may mobilise accessory movements while the patient does physiological ones.
- Normal values worth memorising: shoulder flexion and abduction 0–180, elbow flexion 0–150, knee flexion 0–135, ankle dorsiflexion 0–20, hip abduction 0–45.
- End-feels classify the resistance at range end: normal — soft (knee flexion, tissue approximation), firm (muscular stretch, ankle dorsiflexion), hard (bony, elbow extension); abnormal — boggy (oedema), empty (pain-guarded), springy block (internal derangement such as a meniscal tear).
- Continuous passive motion machines, introduced by Salter for postoperative knees, deliver regulated passive movement in the early days after surgery.
Reading an end-feel at the knee
Sit the patient supine, one hand stabilising the femur, the other cradling the tibia, and flex the knee slowly to its limit. What stops you is a diagnosis in miniature. A soft, mushy resistance with a warm, swollen joint suggests boggy oedema or haemarthrosis. A firm, leathery give that yields slightly is muscle and capsular tightness — the commonest finding after immobilisation. A sudden hard, unyielding stop, often before 90 degrees in an arthritic knee, is bone on bone. A springy, rebounding block that pushes back when you release, with the patient reporting catching and locking between sessions, points to a displaced meniscal tear.
Now repeat the movement passively at speed, noting the arc, then measure it with a goniometer and compare with the sound limb, because a knee is only "stiff" relative to its partner. Record the end-feel in the notes alongside the numbers — "0–95 degrees, springy block" tells the next therapist far more than "limited flexion". Finally, decide the exercise type from the muscle grade: quadriceps at 2/5 earns active-assisted work in a gravity-eliminated plane; at 3 or more, active flexion–extension with heel slides; if the patient cannot participate at all, slow rhythmic passive movement, ten repetitions, twice daily, maintains what the disease or the surgeon has left.
Where students slip
Three errors repeat in exams. First, calling passive ROM a strengthening programme — it cannot be, because no contraction and no overload occur. Second, mixing up the end-feels, especially firm versus hard; muscle stretch gives, bone does not, and the springy block of internal derangement is specific enough to be an MCQ answer on its own. Third, forgetting that active-assisted versus active is decided by manual muscle testing grade, roughly 2 versus 3 — which is exactly how a viva examiner links two topics in one question.
Frequently asked questions
Which type of ROM exercise suits a muscle graded 2/5?
Active-assisted or active movement in a gravity-eliminated position, supplemented by passive movement to maintain full range.
Which end-feel suggests internal derangement of the knee?
A springy or springy-block end-feel, typically from a displaced meniscal tear.
What are the normal ranges of knee flexion and shoulder flexion?
Knee flexion 0–135 degrees; shoulder flexion 0–180 degrees.
Why cannot passive ROM exercise strengthen a muscle?
Strengthening requires voluntary contraction loaded beyond habitual levels; passive movement provides neither contraction nor overload.
What is continuous passive motion and when is it used?
A machine-driven passive movement regimen, classically after knee surgery, maintaining range and cartilage nutrition in the early healing phase.