Does Multidirectional Shoulder Instability Always Need Surgery?

Overview

Multidirectional instability (MDI) is symptomatic shoulder instability in two or more directions, typically atraumatic, often bilateral, and linked to generalized ligamentous laxity. Most patients improve with a structured strengthening program, and surgery is reserved for those who don't. Arthroscopic capsular plication, when needed, tightens the redundant shoulder capsule to reduce excess motion.

Who this is for

• Patients, often younger and more flexible, whose shoulders feel loose or unstable in more than one direction without a specific injury.
• Patients with a positive sulcus sign on exam and a Beighton hypermobility score reflecting generalized ligamentous laxity.
• Patients who have completed a real course of physical therapy directed specifically at shoulder stability and remain symptomatic.
• It is not the right page for a shoulder that dislocated once, in one direction, after a clear traumatic event — that pattern points to the anterior or posterior instability pages instead.

How I approach it

MDI is the one instability pattern where I actively try to talk patients out of surgery first, because the evidence supports it. The landmark study in this area treated 140 shoulders in 115 patients with a specific muscle-strengthening exercise program, and while the original report is best known for an often-quoted "80% success" figure, that number applied specifically to atraumatic shoulders — only 12 of 74 traumatic-instability shoulders had a good or excellent result, compared with 53 of 66 (80%) atraumatic shoulders. I use that distinction carefully with patients: the exercise-first approach works best in genuinely atraumatic, multidirectional laxity, which is exactly the population this page is about. A separate long-term follow-up of 59 MDI patients treated nonoperatively found more modest results — mean Rowe score of 50 and only 38 of 62 shoulders satisfied at 44 months — so I don't oversell rehabilitation as a guaranteed fix. I set real expectations: a structured, sport-specific strengthening program deserves a genuine trial, typically several months, before I'll discuss surgery, and I tell patients this upfront rather than after they've already had an operation offered to them.

When rehabilitation genuinely fails, arthroscopic capsular plication is a reliable next step, and I don't consider it a lesser option — the outcomes in properly selected patients are good. But I also tell patients directly that the amount of generalized ligamentous laxity they have changes what to expect: patients with more hypermobility on exam simply don't improve as much with surgery, and that's not a technical failure, it's biology.

The operation

Arthroscopic capsular plication is performed through shoulder arthroscopy portals:

1. The shoulder is examined under anesthesia to confirm the direction and degree of instability.
2. Redundant capsular tissue is identified circumferentially, wherever the laxity is greatest.
3. Sutures are placed to fold and tighten the excess capsule, reducing the overall volume of the joint capsule and restoring a more normal degree of restraint.
4. In patients without a labral tear, this is typically a capsule-only procedure; concurrent labral pathology, when present, is addressed at the same time.

Risks and honest tradeoffs

• Not everyone with atraumatic MDI does well with rehab alone. The 80% good-or-excellent figure applies specifically to atraumatic shoulders in the original series; a separate long-term cohort of 59 nonoperatively treated MDI patients found a mean Rowe score of only 50 and satisfaction in 38 of 62 shoulders at 44 months, a more sober number than the commonly quoted 80%.
• Generalized hypermobility blunts surgical results. A Beighton score of 4–9 predicted both a smaller improvement in outcome score and a lower chance of an excellent result after capsular plication (P=.030 and P=.010) (Witney-Lagen, JSES 2017).
• Recurrence and complications still happen after surgery. In the 50-patient capsular plication series, there were 2 recurrent instability events, 1 case of stiffness that resolved with physical therapy, and 1 superficial wound infection (Witney-Lagen, JSES 2017).
• General arthroscopic risks apply, including stiffness and, rarely, infection or nerve injury.

Recovery and rehabilitation

• 0–4 to 6 weeks: Sling immobilization; passive range of motion only, as directed, to protect the plicated capsule.
• 6–12 weeks: Progressive active motion and early strengthening.
• 3–5 months: Sport-specific and functional strengthening.
• 5–7+ months: Return to sport; in the largest capsular plication series, 45 of 50 patients returned to their same level of sport, and all 50 returned to work (Witney-Lagen, JSES 2017).

1. 0–4 to 6 weeks

   Sling immobilization; passive range of motion only, as directed, to protect the plicated capsule.

2. 6–12 weeks

   Progressive active motion and early strengthening.

3. 3–5 months

   Sport-specific and functional strengthening.

4. 5–7+ months

   Return to sport.

   in the largest capsular plication series, 45 of 50 patients returned to their same level of sport, and all 50 returned to work (Witney-Lagen, JSES 2017).

Alternatives I considered

• Continued or escalated physical therapy is not just an alternative to surgery in MDI — it is the first-line treatment, and for many atraumatic patients it remains the only treatment they need.
• Thermal capsulorrhaphy, an older heat-based capsular tightening technique, has largely fallen out of favor. Comparative data found capsular plication succeeded in 91% of cases versus 76.5% for thermal capsulorrhaphy, which is why I use suture-based plication rather than a thermal technique when surgery is indicated.