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PHYSIOPEDIA
Shoulder · Cartilage

Shoulder instability (labral tear, dislocation, subluxation)

The labrum is a rim of cartilage that deepens the shoulder socket. Tears (such as SLAP and Bankart lesions) make the joint looser, so the ball can slip partly (subluxation) or fully (dislocation) out—most often forwards when the arm is out to the side and turned outward, like falling on an outstretched hand or the bottom of an incline press. A previous dislocation or naturally loose joints raise the risk.

4.1

Overview

📖 Rehab Science
Medical name
Glenohumeral instability with labral pathology (e.g. SLAP or Bankart lesion)
Common name
Loose or dislocating shoulder

The labrum is a rim of cartilage that deepens the shoulder socket. Tears (such as SLAP and Bankart lesions) make the joint looser, so the ball can slip partly (subluxation) or fully (dislocation) out—most often forwards when the arm is out to the side and turned outward, like falling on an outstretched hand or the bottom of an incline press. A previous dislocation or naturally loose joints raise the risk.

Source: Rehab Science · Ch 16 · PDF pp. 397, 398show sources ▾

Page numbers are those of the uploaded PDF edition. "Find original" opens a PubMed search for the cited study.

4.2

Anatomy & biomechanics

ℹ Additional explanation

The socket is shallow—like a golf ball on a tee. The labrum is the tee's lip; ligaments and capsule are the straps.

Interactive diagram · Shoulder complex
SupraspinatusRight shoulder seen from the front · schematic, not to scale · tap a structure
Original schematic. Anatomy is additional educational explanation; clinical relevance links to Rehab Science Ch 16 (PDF pp. 358–462).
4.3

Signs & symptoms

📖 Rehab Science
Pain locationDeep inside the joint ("can't touch it"), often front of shoulder.
Pain characteristicsSharp, catching pain with certain movements followed by deep aching for hours.
With movementExternal rotation, reaching overhead, out to the side or across the body.
otherPopping, clicking or grinding; feelings of weakness, looseness or that the shoulder could slip out; apprehension in unstable positions.
Source: Rehab Science · Ch 16 · PDF pp. 398, 399· 2 original research citationsshow sources ▾
Also cited by the book on these pages:
  1. [Ch 16·10] Guerrero P, Busconi B, Deangelis N, Powers G. Congenital instability of the shoulder joint: assessment and treatment options. J Orthop Sports Phys Ther. 2009;39(2):124-134. find original ↗
  2. [Ch 16·12] Burkhead WZ Jr, Rockwood CA Jr. Treatment of instability of the shoulder with an exercise program. J Bone Joint Surg Am. 1992;74(6):890-896. find original ↗

Page numbers are those of the uploaded PDF edition. "Find original" opens a PubMed search for the cited study.

4.4

Why does this happen?

📖 Rehab Science
Established mechanisms
  • Trauma — fall on outstretched arm or forced abduction/external rotation
  • Previous dislocation damaging passive restraints
Possible contributing factors
  • Congenital hypermobility
  • Loss of control under load in reaching positions (e.g. incline bench press)
Source: Rehab Science · Ch 16 · PDF p. 398show sources ▾

Page numbers are those of the uploaded PDF edition. "Find original" opens a PubMed search for the cited study.

4.5

Aggravating factors

📖 Rehab Science
Movement / activityWhy it may cause symptomsTemporary modification
Overhead lifting and throwingPlaces the joint near end range where passive restraints are compromised.Avoid end-range overhead loading until phase 3 control is established.
Reaching upCombines lever length and rotation—typical subluxation positions.Work in mid-range with the elbow closer to the body.
Stretching the shoulderStretching a hypermobile joint can increase instability (no stretching in phase 2).Prioritise strength and motor control instead of stretching.

Aggravating factors are temporary—tissues are sensitised or not ready yet. The protocol rebuilds capacity so these tasks become comfortable again.

Source: Rehab Science · Ch 16 · PDF p. 399· 2 original research citationsshow sources ▾
Also cited by the book on this page:
  1. [Ch 16·10] Guerrero P, Busconi B, Deangelis N, Powers G. Congenital instability of the shoulder joint: assessment and treatment options. J Orthop Sports Phys Ther. 2009;39(2):124-134. find original ↗
  2. [Ch 16·12] Burkhead WZ Jr, Rockwood CA Jr. Treatment of instability of the shoulder with an exercise program. J Bone Joint Surg Am. 1992;74(6):890-896. find original ↗

Page numbers are those of the uploaded PDF edition. "Find original" opens a PubMed search for the cited study.

4.6

Assessment & tests

C. Imaging & investigations

MRI or MR arthrography may be used by a clinician to assess labral injury when surgery is being considered.

No single positive test proves a diagnosis. Clinical tests are interpreted together with history and examination by a trained professional.

4.7

Differential considerations

📖 Rehab Science
Biceps tendinopathy (long head) — Both cause front-of-shoulder pain, but biceps tendinopathy does not feel unstable—and the programmes differ.
Rotator cuff injury (tear / tendinopathy) — Cuff pain is more superficial and activity-related, without slipping sensations.

Conditions with overlapping symptoms may need professional assessment to tell apart.

4.8

Treatment & recovery

📖 Rehab Science
Prognosis: Non-traumatic instability often improves significantly in 8–12 weeks; some traumatic cases improve, but recurrent dislocations often need surgical labral repair. Source: Rehab Science · PDF p. 399

8–12 weeks of physio focused on stability and strength. People with naturally loose shoulders or no traumatic injury do well with rehab (about 50–85% success); after a traumatic dislocation that keeps recurring, success with rehab alone is only about 15% and surgery should be considered. Phase 1: self-massage, then ACTIVE range of motion (skipping passive, because lifting is usually less painful than with cuff injuries and active work trains control), then isometrics. Phase 2: no stretching—light rows, presses, lateral raise, bench lift-off and cuff rotation. Phase 3: curl, D2 flexion, prone 90/90, then weight-bearing control (shoulder taps → clock → dolphin press) and finally the shoulder press.

Diagram · The three-phase frameworkOriginal illustration
1Calm it down• Reduce pain; modify aggravators• Soft tissue, mobility, isometricsProgress when:No pain at rest≤ 3/10 with the exercisesinflammatory phase2Restore movement• Range of motion & control• Isometric + eccentric loadingProgress when:Full range with controlMild-to-no painmaturation phase3Build capacity• Full-range resistance training• Progressive overload; sportProgress when:Pain resolved — keeptraining to prevent recurrenceremodelling phase
The same framework treats pain and injury. Progression is driven by symptoms and function—not by days—and with injury it also respects tissue healing time. — Based on concepts in Rehab Science Ch 5 (PDF pp. 80–82), Ch 10 (PDF pp. 182–190), Ch 11 (PDF p. 203).
Source: Rehab Science · Ch 16 · PDF pp. 399, 400, 401· 3 original research citationsshow sources ▾
  1. [Ch 16·10] Guerrero P, Busconi B, Deangelis N, Powers G. Congenital instability of the shoulder joint: assessment and treatment options. J Orthop Sports Phys Ther. 2009;39(2):124-134. find original ↗
  2. [Ch 16·11] Misamore GW, Sallay PI, Didelot W. A longitudinal study of patients with multidirectional instability of the shoulder with seven- to ten-year follow-up. J Shoulder Elbow Surg. 2005;14(5):466-470. find original ↗
  3. [Ch 16·12] Burkhead WZ Jr, Rockwood CA Jr. Treatment of instability of the shoulder with an exercise program. J Bone Joint Surg Am. 1992;74(6):890-896. find original ↗

Page numbers are those of the uploaded PDF edition. "Find original" opens a PubMed search for the cited study.

AMBER — get assessed before starting rehab
Recurrent dislocations—especially after a traumatic first dislocation—warrant a surgical opinion. A first dislocation that does not reduce, or numbness/weakness in the arm, needs urgent medical care. Source: Rehab Science · PDF p. 399
4.9

Prevention

📖 Rehab Science

Maintain cuff, biceps and scapular strength and closed-chain control; avoid stretching hypermobile shoulders; build strength in arm-away-from-body positions.

Injury prevention principles → · Return-to-sport stages →