Shoulder Biomechanics

SHOUDER JOINT IS A BALL AND SOCKET, ANTEVERTED TYPE OF JOINT.

BONES OF THE SHOULDER JOINT

• SCAPULA

• HUMEROUS

• CLAVICLE

JOINTS AT SHOULDER JOINT

• GLENO-HUMORAL

• ACROMIO-CLAVICULAR

• STERNO-CLAVICULAR

• SCAPULO-THORACIC

LIGAMENTS OF THE SHOULDER JOINT

• SUPERIOR GLENO-HUMORAL LIGAMENT(S.G.H.L)

• MEDIAL GLENO-HUMORAL LIGAMENT(M.G.H.L)

• INFERIOR GLENO-HUMORAL LIGAMENT (I.G.H.L)

( ANTERIOR , POSTERIOR BANDS AND AXILARY APPROCH)

• CORACHOHUMORAL LIGAMENT(C.H.L)

MUSCLES OF THE SHOULDER JOINT

• TRAPEZIUS

• SERATUS ANTEROIR

• ROTATOR CUFF (GALENOHUMORAL)

• SUPRASPINATUS

• INFRASPINATUS

• TERES MINOR

• SUBSCAPULARIS

• LATISMUS DORSI

• PECTORALIS MAJOR

• DELTOID

• BICEPS

• TRICEPS

CARTILAGE

• GLENOID LABRUM

OTHER STRUCTURES

• BRACHIAL PLEAXUS

• BRACHIAL ARTERY

MOVEMENTS AT SHOULDER JOINT

• FLEXON

• EXTENSION

• ADDUCTION(HORIZONTAL)

• ABDUCTION(HORIZONTAL)

• CIRCUMDUCTION

• EXTERNAL ROTATION

• INTERNAL ROTATION

RANGE OF MOVEMENTS AT SHOULDER JOINT

• FLEXON 150-180 DEGREE

• EXTENSION 50-60 DEGREE

• ABDUCTION 150-180 DEGREE

• ADDUCTION 30-40 DEGREE

• EXT. ROTATION 90 DEGREE

• EXT. ROTATION 70-90 DEGREE

LIGAMENTS STABILITY DURING MOVEMENTS

EXT.ROTATION AT “0 DEGREE” S.G.H.L, C.H.L, SUBSCAPULARIS

AT “45 DEGREE” S.G.H.L, M.G.H.L

AT “90 DEGREE” ANTERIOR BAND OF I.G.H.L

INT.ROTATION AT “0 DEGREE” POSTERIOR BAND OF I.G.H.L

AT “45 DEGREE” ANTERIOR AND POSTERIOR BAND OF I.G.H.L

AT “90 DEGREE” ANTERIOR AND POSTERIOR BAND OF I.G.H.L