Download Scapular Kinematics: So how is the scapula supposed to move?

Scapular Kinematics: So how is the scapula supposed to move?
Lori Michener PhD, ATC, PT, SCS
Department of Physical Therapy
Rm 100, West Hospital
Virginia Commonwealth University – Medical College of Virginia
Richmond, VA 23298
[email protected]
Methods of measurement of scapular kinematics
1. Two – dimensional: Radiographs, goniometers, video
2. Three – dimensional: Radiographs, digitizers, magnetic tracking device
Scapular Kinematics
Ant / Post
Tilting
Internal / External
Rotation
AC
Ant / Post
Tilting
Up / Down Rotation
q
Normal motion
q 3 Rotations:
Upward Rotation (UR) / Downward rotation (DR)
Internal rotation (IR) / External rotation (ER)
Anterior tilt (AT) / Posterior tilt (PT)
q 2 Positions / Translations:
Superior / Inferior
Anterior / Posterior
q Translations defined by clavicular motion because the scapula is constrained at AC jt
q
With GH elevation, via direct bone pins the scapula :
q Rotations:
q UR (Mean = 50°)
q ER (Mean = 24°)
q PT (Mean = 30°)
q Positions / Translations:
q Clavicular elevate (Mean = 10°)
q Clavicular retraction (Mean = 21°)
(McClure et al, JSES, 2001):
q
Scapulohumeral Rhyt hm
q 2:1 is standard
q 5:4 (Poppen & Walker, JBJS, 1976); 1.7: 1 (McClure et al, JSES, 2001); 1.5 – 2.4: 1 (Graichen et
al, Clin Ortho, 2000); 2.15 : 1, 0-30: 4.23 : 1 (> H), 91-120: 1.65: 1 (Padua D et al, MSSE,
2003)
Scapular Kinematic Control and Limitations by:
q Scapular muscles, RC muscles, Spine (thoracic and cervical), pathology of the
shoulder joint, ligaments, GH joint capsule, clavicle (via AC joint)
Scapular muscle fatigue and weakness:
q ↑ed UR w/ upper trap & serratus anterior fatigue (McQuade et al, JOSPT, 1998)
q ↓ed UR and PT w/ upper & lower trap fatigue (McQuade et al, Clin BIomech,1995)
q ↓ed PT, ER, UR w/ ↓ed serratus & ↑ed lower trap activity (SAIS) (Ludewig & Cook, Phys
Ther, 2000)
q
External load alters kinematics; fatigue??
(Pascoal et al, Clin Biomech, 2000; McQuade, 1995)
Rotator cuff muscle fatigue and weakness:
q ↓ed PT with infraspinatus & teres minor fatigue
q Same effect with RC tendonitis?
(Tsai et al, Arch Phys Med Rehab, 2003)
Muscle fatigue and weakness: scapular or rotator cuff muscles
q Alters scapular kinematics
q Less scapular stability?
q Is it a motor control issue, rather than strength?
q Altered GH kinematics?....evidence for this later
q Implication: overhead athletes / workers?
Spinal posture
q ↑ed cervical flexion
q ↓ed UR & PT (Ludewig & Cook, J Occ Rehab, 1996)
q ↑ed thoracic flex (change of 12 degrees from upright ):
q ↑ed (sup) position, & ↓ed posterior tilt
q ↓ed GH abduction force (Kaebeatse et al, Arch Phys Med Rehab, 1999)
q Slouched posture vs. upright:
q ↓ed posterior tilt & ↓ed external rotation (Finley & Lee, Arch Phys Med Rehab, 2003)
Others
q
q
q
Ligaments, Clavicle : No evidence
Capsule: posterior
q Simulated tightness and clinical exam:
q ↓ed GH IR, limited cross-body adduction at 90 deg (PSTT), ↑ed superior
translation of HH (Tyler, et al, AJSM, 2000; Harryman et al; JBJS, 1990; Branch et al; AJSM, 1995)
Pathology
q SAIS, RCT, instability, AC jt arthritis, Humeral head position
Impingement Syndrome and scapular kinematics
q Kinematics (during glenohumeral elevation):
q ↓ed PT (Ludewig & Cook, Phys Ther, 2000., Lukasiewicz et al, JOSPT, 1999.,
McClure et al, JOSPT, 2002;
Endo et al, J Orthop Sci, 2001 (x-ray))
↓ed ER (Ludewig & Cook, Phys Ther, 2000; Hebert, LJ et al, Am Phys Med Rehab, 2002)
q ↓ed UR (Ludewig & Cook, Phys Ther, 2000; Endo et al, J Orthop Sci, 2001 (x-ray))
Position:
q ↑ed winging (AT & IR) (Warner JJ et al, 1992)
q ↑ed Sup & Med trans (Lukasiewicz et al, JOSPT, 1999)
Adequate scapular motion required for “maintenance” of adequate SA space
Pattern of decreased UR, ER, and PT has been demonstrated to decrease the area of the
SA space (Solem-Bertolf, Clin Ortho, 1993)
q
q
q
q
Rotator Cuff Full- thickness tears and scapular kinematics
q ↑ed humeral head superior translation during simulated or active GH elevation; in
patients or cadavers with FT RCT (Thompson, AJSM, 1996; Poppen & Walker, 1976; Deutsch, 1996;
Paletta, 1997; Yamaguchi, 2000)
q
q
No evidence of altered scapular kinematics
This may cause altered scapular position or kinematics with RC weakness
Glenohumeral instability and scapular kinematics
q Position: ↑ed winging (AT & IR) (Warner JJ et al, 1992)
q Abnormal scapular DR disrupts the “shelf mechanism” of the inferior glenoid fossa
support of the humeral head…resulting in inferior instability (Itoi et al; JSES; 1992)
Adhesive capsulitis and scapular kinematics
q Patients with shoulder adhesive capsulitis (n=10)
q Altered SHR, increased contribution of scapular upward rotation
q Altered in elevation in scaption, flexion, and abd (Vermeulen HM et al, Ann Rheum Dis, 2002)
q With a stiff GH joint, the ST articulation appears to be able to compensate to allow for
total shoulder ROM
Altered scapular kinematics
q Can we capture differences?
q With treatment or comparison to healthy?
q Consider the “robustness” of the neuromuscular system
q Is the “best” measure to examine kinematics with a combination of all 3 rotations or 3
rotations and 2 positions
q Is a larger insult needed to see “obvious” measurable differences?
Scapular Dyskinesis: Examination and Intervention in Patients with Upper Quarter Dysfunctions
Clinical Evaluation of the Scapula: Phil McClure PhD, PT Arcadia University
-1Existing Literature
Kibler Am J Sp Med 981
Sobush et al JOSPT 96 (Lennie Test)2
Odom et al Phys Ther 20013
Johnson et al JOSPT 20014
Basic Problem: Attempts to capture a 3-dimensional, dynamic phenomenon with static, 2dimensional measurements are likely to fail
Judgements Based on Visual Observation
Kibler et al. JSES 20025
Type 1 (Inf angle prominence)
TypeII (medial border prominence)
Type III (early scap elevation)
Intertester K=(0.31-0.42)
Intratester Κ=(0.40-0.59)
McClure et al JOSPT 2003 (abstract)6
7 prescribed tasks
Winging (medial or inf angle) OR Dysrhythmia (abnormal upward rot or elevation)
Intertester Kappa=0.6, 72% agreement
Tate et al JOSPT 2004 (abstract)7
-validation of visual judgements using 3D motion analysis
-Dyskinesia group showed ant tilt, internal rotation, protraction
Our Current Approach
Scapular Dyskinesia Test
- 5 test movement (flexion, abduction with and without weight, flip test)
- Winging OR Dysrhythmia
- posterior and superior view
Scapular Reposition Test
- alteration of symptoms during provocative tests by repositioning scapula
- move scapula toward posterior tilt and external rotation by grasping shoulder girdle from
behind and bringing forearm obliquely across medial border
- look for decreased pain or increased strength for + test
Other Important Considerations
Specific muscle testing
- Trapezius
- Serratus Anterior
- Distinguishing between true weakness (palsy) vs motor control deficit
Key Areas of Hypomobility
- upper thoracic extension
- pec minor
- posterior capsule
Scapular Dyskinesis: Examination and Intervention in Patients with Upper Quarter Dysfunctions
Clinical Evaluation of the Scapula: Phil McClure PhD, PT Arcadia University
-2References
1.
Kibler WB. Role of the Scapula in Athletic Shoulder Function. Am J Sports Med. 1998;26(2):325337.
2.
Sobush DC, Simoneau GG, Dietz KE, Levene JA, Grossman RE, Smith WB. The Lennie Test for
Measuring Scapular Position in Healthy Young Adult Females: A Reliability and Validity Study. J
Orthop Sports Phys Ther. 1996;23(1):39-50.
3.
Odom CJ, Taylor AB, Hurd CE, Denegar CR. Measurement of scapular asymetry and assessment
of shoulder dysfunction using the Lateral Scapular Slide Test: a reliability and validity study. Phys
Ther. Feb 2001;81(2):799-809.
4.
Johnson MP, McClure PW, Karduna AR. New method to assess scapular upward rotation in
subjects with shoulder pathology. J Orthop Sports Phys Ther. 2001;31(2):81-89.
5.
Kibler WB, Uhl TL, Maddux JW, Brooks PV, Zeller B, McMullen J. Qualitative clinical
evaluation of scapular dysfunction: a reliability study. J Shoulder Elbow Surg. Nov-Dec
2002;11(6):550-556.
6.
McClure P, Tate A, Egner M, Greenberg E, Yops R, Neff N. Development and Inter-rater
Reliability Testing of a System of Classification for Scapular Dysfunction. Journal Orthopaedic
and Sports Physical Therapy. 2003;33(2):A23-24.
7.
Tate A, McClure P, Neff N. Validity of a Visual Classification System for Scapular Motion. J
Orth Sport Phys Ther. 2004;34:A42.
SCAPULAR DYSKINESIS: EXAMINATION AND INTERNVENTION IN PATIENTS WITH
UPPER EXTREMITY DYSFUNCTION
REHABILITATION CONSIDERATIONS
Tim L. Uhl PT, PhD, ATC Division of Athletic Training, Department of Rehabilitation Science, University of
Kentucky, Lexington, KY 40536, [email protected]
Description:
Rehabilitation goals following shoulder injury is to implement a continuum of exercises that
restores optimal function while protecting the anatomic integrity of the injured or repaired
tissues. The exercises should allow a progression of intensity and load that is within the healing
tissue’s capabilities. A key element in rehabilitation is the successful transition in the flow of
exercises from the protected exercises of the acute phase to the functional phase. Emphasis of
this presentation will be on the component of scapular muscle exercises. The scapular muscles
are not exercised in isolation of the other shoulder musculatures but need to work synergistically
with the other shoulder girdle musculature for upper extremity function. Exercise selection for
scapular musculature strengthening exercises based on EMG research is readily available. 7-9,26
This presentation attempts to organize the previous available information along with new
information obtained by the presenter into logical progression from low to high demand
exercises in order to better rehabilitate your patients.
Objectives:
To describe treatment interventions to facilitate mobility, strength and neuromuscular control of
the shoulder.
To provide evidence and or scientific rationale that is available to support these interventions.
Key Points:
•
Therapeutic Exercises are beneficial in rehabilitation of patients with
• Shoulder instability11
• Rotator cuff pathology 12,25
• Appear to be helpful in recover of associated scapular dysfunctions long thoracic
neuropathy and snapping scapula35
•
Proximal Stability
• Without proximal control distal structures are moving on poor foundation
• Motion and force applied by distal upper extremity initiates proximally 17,37
• Strength and endurance of upper extremity is dependent on trunk16
•
Posture of spine effects scapular position, motion, and shoulder strength14
•
Position and motion of the scapula effects glenohumeral joint function and subacromial
space
• Impingement patients have decreased scapular mobility19,21
• Tight pectoralis major decreases scapular motion 4
•
Neuromuscular Control of scapular musculature is diminished in the presence of
pathology 19,29,30
• Diminished force production of scapular musculature6
• Scapular muscular activation diminished due to imbalance and pain27,29,30
•
•
Exercises that facilitate posterior tilting and external rotation (retraction) of
scapula are critical for overhead function
Exercise that facilitate lateral translation and internal rotation (protraction) of
scapula are critical for accelerating sport implements and absorbing energy
•
•
Therapeutic Interventions need to address:
Proximal stability and posture
• Flexibility to reverse anterior tilt and internal rotation posture
• Shoulder mobility associated with improved function23
• Rehabilitation programs may positively effect posture and scapular position34
• Integrate the kinetic chain to facilitate activation of trunk24
• Transmission of force along kinetic chain typically incorporates rotation (Serape
muscles)
• Rehabilitation of the shoulder should incorporate exercises to promote erect
trunk posture and stable scapular position.31
•
Strengthening exercises should progress from low to high demand22
• Progressive resistive exercises can increase shoulder strength and improve
patient function23,34
• Avoiding inflaming healing tissues
• Pain inhibits muscle activation at a central level 5,28
• Altering central motor drive may effect muscle activation patterns for
movement
• Arm supported activities diminishes muscular demand36
• Progression of muscular demand can be monitored by load placed through arm33
•
Re-establish neuromuscular control of shoulder musculature
• Closed kinetic chain exercises promote joint compression and activation of
proximal musculature to provide stabilization1
• Scapular re-education can be accomplished through several tasks
• Consider upper trapezius/serratus anterior EMG ratio during exercise selection to
minimize superior scapular translation (shrug) and facilitate medial scapular
border control20
Clinical Application
Incorporation of rehabilitation techniques that address trunk, scapular, and humeral mobility and
control appear to effectively address impairment of diminished strength, motion, and pain
commonly seen in patients with musculoskeletal disorders. Gradual introduction of therapeutic
exercises while minimizing inflammation of healing tissue and restoring neuromuscular control is
the ultimate goal of re-establishing function.
Acute Phase Exercises graded by (%MVIC + S.D.)
Exercise
Deltoid
Supraspinatus
N.A. = Not available
Up.
Trap.
Ser.
Ant.
Low.
Trap.
Supine PROM15
3+1
1+6
1+2
2+2
2+2
Forward Bow15
2+1
5+6
2+3
5+4
2+2
Sidelying
Elevation10
10 + 6
2+6
2+3
11 + 7
8+5
Towel Slides10
12 + 7
7+7
4+3
7+4
1+1
Supine Pressup 1#15
11 + 4
3+7
1 +3
16 + 8
1+1
T-Bar10
24 + 9
9+9
9+8
17 + 6 10 + 10
Sub-acute Phase Exercises graded by (%MVIC + S.D.)
Exercise
Deltoid
SupraUp.
spinatus
Trap.
Ser. Ant.
Low.
Trap.
Wedge
Press-up15
20 + 9
8 + 11
11 + 11
17 + 8
2+1
Ball Rolls10
25 + 8
11 + 10
9+3
21 + 7
5+4
Ipsilateral
Step- up15
21 + 7
22 + 20
21 + 8
15 + 5
13 + 6
Active
Elevation10
32 + 8
19 + 12
19 + 9
23 + 7
19 + 8
Standing
Press-up15
30 + 11
30 + 17
24 + 8
29 + 13
9+5
PK
39 + 16
PK
34 + 23
PK
10 + 6
Rows with
elastic
tubing7,13
N.A.
N.A
AVG
9+2
AVG
9+6
AVG
5+4
Shrugs with
elastic
tubing13
Forward
Punch13
PK
44 + 25
PK
53 + 29
PK
31 + 24
AVG
10 + 6
AVG
13 + 8
AVG
5+4
N.A.
PK
39 + 23
PK
48 + 83
AVG
9+4
AVG
8+3
N.A.
PK
49 + 14
N.A.
N.A.
AVG
10 + 3
N.A. = Not available
PK = peak amplitude during phase
AVG = average amplitude during phase
Functional Phase Exercises graded by (%MVIC + S.D.)
Exercise
Deltoid
SupraUp.
spinatus
Trap.
Ser. Ant.
Low.
Trap.
Scaption >
120°9,32
72 + 13
64 + 28
79 + 19
96 + 24
61 + 19
Scaption <
80°2,9
91 + 26
82 + 27
72 + 19
62 + 18
50 + 21
Unilateral
Rows9,32
72 + 20
N.A.
63 + 17
14 + 6
45 + 17
N.A.
N.A.
79 + 18
43 + 17
97 + 16
Prone
Flexion @
135° ABD9
Diag Flex/
Horiz Add/
Ext. Rot.9
N.A.
N.A.
66 + 10
100 + 24
39 + 15
72 + 24
56 + 48
64 + 26
82 + 36
N.A.
N.A
N.A
7+ 3
62 + 19
11 + 5
N.A.
N.A
50
140
30
79 + 20
78 + N.A.
66+ 18
9+3
74 + 21
N.A.
50 + N.A.
20+ 18
57 + 22
79 + 21
Military
Press26,32
Unilateral
shoulder
press supine
w/plus9
Push up
w/plus18
Prone
Horizontal
ABD3,9
Prone ER @
90°3,9
N.A. = Not available
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