Subscapularis Tears

AnatomySSC Longitudinal Tear

 

Largest and most powerful rotator cuff

- arises coastal border of scapula

- superior 2/3 tendon inserts into LT

- inferior 1/3 inserts into proximal humerus

 

Action

- IR (with T major, P major, Lat Dorsi)

- part of force couplet depressing humeral head

 

Incidence

 

Can be isolated event

 

More commonly seen with SS tears (2% in MRI study)

- anterosuperior tears

 

Associations

- HAGL

- biceps subluxation

- coracoid impingement

 

MOI

 

Trauma

- hyperextension and ER

 

Degenerative

 

Examination

 

Pain anterior shoulder

 

Increased ER

 

Lift off test

 

Belly Press

- elbow falls posteriorly to harvest post deltoid

 

MRI

 

Subscapularis Tear MRISubscapularis FT Tear MRI Glenoid RetractionMRI Retracted Subscapularis TearMRI SSC tear minimal retraction

 

Arthroscopy

 

Complete absence of SSC

 

Subscapularis Retracted Tear Arthroscopy

 

Comma Sign

 

SSC tornSSC Comma Sign

 

Medially Subluxed Biceps

 

Medially Subluxed Biceps

 

Management

 

Operative Indications

 

Degenerative

- failure of 6/12 non operative

 

Trauma

- fix acutely

 

Options

1.  Debridement

2.  Open Repair

3.  Arthroscopic Repair

 

Debridement

 

Results

 

Edwards et al Arthroscopy 2006

- 11 patients with SSC tears

- debridement

- tenotomy in 9 with dislocating / unstable biceps

- 9/11 good results

 

Open Repair

 

Technique

 

Deltopectoral approach

- preserve axillary nerve inferiorly

- mobilise SSC

- subscapular nerves on anterior surface medial to glenoid rim

- tenodesis LHB

- suture anchor repair to lesser tuberosity

 

Results

 

Barti et al Am J Sports Med 2010

- 30 traumatic tears, patient average age 43

- associated biceps subluxation and HAGL's seen

- repair structurally intact in 93%

- 20% still unable to perform lift off / belly press tests

- these patients had higher degree of fatty infiltration preoperatively

 

Arthroscopic Repair

 

Intra-articular technique

- camera in GHJ

- anterosuperior portal

- mobilise tendon front and back

- must remove adhesions

- roughen insertion point on LT / gentle with burr as bone is soft

- insert twinfix anchors x 2 via stab incision

- pass birdsbeak suture passer through portal and through SSC

- retrieve 3 sutures through tendon

- retrieve 4th suture over top of SSC

 

Extra-articular Technique

- see article

 

Results

 

Lafosse et al JBJS Am 2007

- isolated repair in 17 patients

- 15 intact repairs and 2 partial reruptures on CT arthrogram

- good outcomes

 

Late reconstruction

 

P. major transfer

 

Results

 

Jost et al JBJS Am 2003

- good results in isolated SSC tears

- results poor in shoulder arthroplasty