Liganment, Meniscus, Cartilage, Muscle, Alignment

Functional Knee Brace forOA & Instability

Dr. Cheng Ngok, Orthopaedic Surgeon

(Rubber)(Rubber)

180°: Relaxed90°: Tight

180°:Tight90°:Relaxed

Meniscus (Outer:Thick, Inner:Thin) Tibial plateau

Meniscus Medial

ACL

Lateral

Meniscus

LCL

MCL

Tibial plateau

Tibial plateau

Tibial liganment

②

③

①

Using 3-points leverage to

transfer the weight bearing

to normal size, so the

affected side will not come

apart and will regeneration.

(Choice of meniscus tear’s treatment)

Feel weight-bearing at medial size

Meniscus tear atRed zone

Meniscus move forward

when knee extension

Meniscus move backward

when knee flexionMeniscus follow

knee rotation

Ring pressure on the meniscus:

Disperses body pressure

After meniscus injury:

Ring pressure disappears, upper body pressure

is concentrated on the tibial plateau

Quadriceps

Hamstrings

Knee:Front view

Knee:Back view

Pain Pain

Normal

Loading

alignment

Inspection alignment: Judgment of

foot type and pain point

Anatomical

line

1. Isolated Tear: ACL(4*), PCL(*), MCL(2*), LCL(*)

2. Multiple Tear:

(a) ACL + MCL ± medial meniscal tear

(b) ACL + LCL ± lateral meniscal tear

后十字韧带

Movement of knee instability

Tibial plateau

Meniscus Medial

ACL

Lateral

Meniscus

LCL

MCL

Tibial plateau

Tibial plateau

Tibial liganment

PCL

Torn LPCL

Triad

ACL partial tear

1. Old knee injury

2. Risky sports or work

3. Weak knee muscles (Ladies)

Hard plastic bar:

Prevents MCL /

LCL tear.

Double upright

hinge with

extension /

flexion control.

Soft plastic

frame. Prevents

ACL / PCL. tear

Functions：

(Knee general artificial joint)

Complete ACL tear

K07b ACL Light Brace

± 40y

± 10y

± 20y

Future

Option1:Casting

Option4:Free of brace or cast

Option2:Post-op Knee Brace K19b

Option3:ACL Light Brace K07b

Reasons (rationale) of Post-OP using ROM brace ?

②

③

①

Unbraced OA of a 50-year old metal worker

Before

Correction

During

Correction

Braced by OA corrector of the same metal worker

3-points leverage

• Stabilize the joint

• Realign malalignment

• Prevention of OA

• Relieve loading Pain

Malalignment

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

Draper[1] Horlick[2] Matsuno[3] Pollo[4]

No Sedan Chair No CrutchNo Wheelchair

±80y±60y

>100y

±20y

Improvement of life quality Surgery free or delay surgery

• Walking Pain Free

• Non-drugs

❖Not suitable for overweight patients

❖Not suitable for swollen knee

❖Not suitable for serious OA

❖Not suitable for psychosis patients

❖Patients need cooperation, clinical follow-up