Joint Traction

Classification

Element	Detail
Category	Non-Swedish — Joint Mobilization
Subcategory	Joint distraction / decompression
FOMTRAC	PC 3.2o
Fritz Method	Joint movement (distraction force perpendicular to treatment plane)

Purpose

Decompress joint surfaces by separating the articular bones
Reduce intra-articular pressure and pain
Stretch the entire joint capsule uniformly (rather than one specific direction)

Mechanism

Traction applies a force perpendicular to the treatment plane (the tangent to the concave joint surface), pulling the convex surface away from the concave surface. This creates separation between the articular surfaces, which: (1) reduces intra-articular pressure — this directly reduces compression on articular cartilage and subchondral bone, decreasing nociceptive input; (2) stretches the joint capsule uniformly in all directions — unlike glide mobilization which stretches the capsule on one side, traction stretches the entire capsular envelope; (3) stimulates Type I and Type II joint mechanoreceptors — the capsular stretch activates inhibitory pathways that reduce pain and muscle guarding; and (4) promotes synovial fluid exchange — the separation creates a suction effect that draws synovial fluid into the joint space, improving cartilage nutrition. The joint MUST be in its resting (loose-packed) position for traction to be effective — in close-packed position, the capsule is already taut and traction will compress rather than separate the joint.

Indications

Joint pain with compressive component (weight-bearing joints, post-activity soreness)
General capsular tightness (traction stretches the capsule in all directions before targeted glides)
Joint effusion (traction reduces intra-articular pressure)
Pre-mobilization: traction before glide mobilization prepares the joint by taking up capsular slack
Degenerative joint conditions (OA) with compressive pain (palliative)
Post-immobilization stiffness (general capsular restriction)
Disc compression symptoms (spinal traction — with appropriate training)

Contraindications

Joint instability or hypermobility (further separation worsens laxity)
Acute fracture
Active joint infection
Malignancy near the joint
Acute ligament rupture (the ligaments that normally limit distraction are compromised)
Joint effusion (severe) — mild effusion may benefit, but severe effusion increases risk
Rheumatoid arthritis in acute flare
Advanced osteoporosis (fracture risk with distraction force)
Spinal traction: disc herniation with progressive neurological deficit (refer)

Effects

Immediate:

Separation of articular surfaces
Reduced intra-articular pressure
Uniform capsular stretch
Mechanoreceptor-mediated pain inhibition
Improved synovial fluid exchange
Reduced periarticular muscle guarding

Cumulative (over multiple sessions):

Progressive capsular extensibility
Improved joint nutrition through enhanced synovial circulation
Reduced compressive joint pain
Improved preparation for targeted glide mobilization

Risks and Side Effects

Post-treatment soreness (mild, 24 hours)
Joint irritation if applied with excessive force
Hypermobility if over-applied
Aggravation of ligament laxity in already unstable joints
Nerve traction injuries if excessive force is applied to joints near nerve plexuses

Common errors:

Applying traction with the joint in close-packed position (the capsule is already taut — traction compresses rather than separates)
Pulling along the shaft of the bone rather than perpendicular to the treatment plane
Jerking rather than applying gradual, sustained traction
Not stabilizing the proximal segment
Confusing traction with glide mobilization (traction separates; glides translate)

Expected Outcomes

Short-term (same session):

Reduced joint pain (especially compressive pain)
Sensation of joint "opening" or "freedom"
Improved tolerance for subsequent glide mobilization

Medium-term (over multiple sessions):

Reduced chronic compressive joint pain
Improved overall joint mobility (capsular extensibility)
Better response to glide mobilization

Execution

Step	Detail
1. Position	Place the joint in its RESTING (loose-packed) position — this is critical. Maximum capsular laxity allows maximum joint separation.
2. Stabilize	Fix the proximal bone with one hand, belt, or body contact.
3. Grasp	Grip the distal bone as close to the joint line as possible.
4. Direction	Apply force PERPENDICULAR to the treatment plane (away from the concave surface). This pulls the bones apart.
5. Apply	Gradually increase the traction force — never jerk.
Grade I traction	Neutralize compressive forces only (take up slack). Used as a pre-positioning technique before glide mobilization.
Grade II traction	Tighten the periarticular structures (stretch begins). Used for pain relief and general capsular stretching.
Grade III traction	Stretch the periarticular structures (actual tissue stretching). Used for mobility restoration.
6. Hold	Sustain traction for 10-30 seconds (Grade II) or intermittent 7-10 sec holds (Grade III).
7. Release	Gradually reduce force. Do not release suddenly.
8. Reassess	Re-test joint pain and ROM.

Parameters

Parameter	Range	Clinical Reasoning
Force	Sufficient to separate joint surfaces (varies by joint — small joints need less force)	Too little = no separation; too much = tissue damage
Direction	Perpendicular to the treatment plane	Must be exactly perpendicular for true distraction; any angulation converts to a glide
Joint position	Resting (loose-packed)	Close-packed position prevents separation
Hold duration	10-30 seconds sustained or intermittent 7-10 sec holds	Sustained for creep; intermittent for pain relief
Repetitions	3-5	Reassess between repetitions
Traction grade	I (pre-positioning), II (pain relief), III (mobility)	Match grade to clinical goal

Clinical Notes

Traction as a pre-mobilization technique: Many clinicians apply Grade I traction (taking up slack) before performing any glide mobilization. This neutralizes compressive forces and allows the glide to be applied with less resistance. Think of it as "un-jamming" the joint before translating it.
Resting position is non-negotiable: If the joint is not in its resting position, the capsular fibers on one side are already taut, and traction will compress rather than separate the joint. Know the resting position for every joint you mobilize.
Clinical pearl: Intermittent traction (apply, hold 7-10 seconds, release, repeat) is generally preferred over sustained traction for peripheral joints because it promotes synovial fluid exchange through the "pump" effect — each cycle draws fluid in during traction and distributes it during release. Sustained traction is more common for spinal traction where sustained decompression is the goal.

Verbal Script

"I'm going to gently pull your [joint] apart to create some space between the bones. This is called traction — it reduces pressure inside the joint and helps with pain. You should feel a gentle pulling sensation. It should not be painful. Let me know how it feels."

Distinguishing Features

Feature	Joint Traction	Mobilization Glides (Grade I-IV)
Direction of force	PERPENDICULAR to joint surface (separates)	PARALLEL to joint surface (translates)
What moves	Bones move APART	One bone slides along the other
Capsular stretch	Uniform (entire capsule stretched evenly)	Directional (one side of capsule stretched)
Primary use	Decompression, pain relief, pre-mobilization	Restoring specific directional mobility
Joint position	Must be in resting position	Resting (accessory) or specific (physiological)

Key Takeaways

Joint traction separates articular surfaces by applying force perpendicular to the treatment plane — it decompresses the joint rather than translating (gliding) the bones
The joint MUST be in its resting (loose-packed) position for traction to work — close-packed position prevents separation
Traction grades: I (pre-positioning), II (pain relief/general capsular stretch), III (mobility restoration)
Distinguish from glides: traction separates (perpendicular force); glides translate (parallel force)
Commonly used as a pre-mobilization technique — Grade I traction before glide mobilization neutralizes compression and improves glide effectiveness