Shoulder Arthroscopy
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Direct answer
Shoulder arthroscopy is keyhole surgery of the glenohumeral and subacromial spaces, done in either the beach-chair or the lateral decubitus position, using a 30-degree arthroscope through a standard portal set. The posterior viewing portal sits about 1 cm medial and 2 cm inferior to the posterolateral corner of the acromion; anterior, lateral and accessory portals are then established under direct vision with an outside-in technique using a spinal needle. Its indications have expanded from diagnostic inspection to Bankart repair, SLAP repair, rotator cuff repair, subacromial decompression, capsular release for adhesive capsulitis, arthroscopic-assisted fracture fixation and distal clavicle excision. Complications are rare but examinable: traction neurapraxia, fluid extravasation, portal-site injury to the axillary nerve, and hypotensive bradycardia from the Bezold-Jarisch reflex in the beach-chair position.
What you must remember
- Positions: beach-chair (semisitting, allows easy conversion to open, risk of cerebral hypoperfusion and hypotensive bradycardia) versus lateral decubitus with traction (better for inferior labral work, risk of traction neurapraxia).
- Portal anatomy: posterior viewing portal 1 cm medial, 2 cm inferior to the posterolateral acromial corner through the soft spot; anterosuperior portal for instrumentation; lateral portal for subacromial work; the 5 o'clock position portal is approached with care for the axillary nerve and cephalic vein.
- Arthroscopic landmarks: the long head of biceps root, the superior glenohumeral ligament, the middle glenohumeral ligament and the inferior glenohumeral ligament forming the anterior labral attachment — know the "triangle" of biceps, subscapularis and middle glenohumeral ligament.
- Bankart repair: re-anchor the anteroinferior labroligamentous complex to the 3 to 6 o'clock glenoid rim with suture anchors; bioabsorbable and all-suture anchors are current options.
- SLAP repair: type II (biceps root detachment) is the one commonly repaired; type IV (bucket-handle extension into biceps) may need repair or tenodesis depending on tendon involvement.
- Capsular release for frozen shoulder: arthroscopic anteroinferior release between the ranges of the middle glenohumeral ligament and subscapularis, combined with gentle manipulation under anaesthesia.
- Distension fluid: normal saline under pressure; watch for fluid extravasation into the neck and airway in lengthy procedures.
A typical operative workflow
Consider a 22-year-old with a first-time anterior dislocation. After examination under anaesthesia confirms the instability, the posterior portal is made in the soft spot, the scope is introduced, and a systematic 15-point diagnostic tour begins: biceps root and superior labrum, axillary pouch, inferior glenohumeral ligament, anterior labrum, middle glenohumeral ligament, subscapularis, rotator interval, then the posterior labrum and rotator cuff from within the joint. A drive-through sign — the scope passing easily across to the posterior gutter — confirms capacious laxity. An anterosuperior working portal is then created with an outside-in needle, a labral elevator frees the stripped capsule, the glenoid rim is lightly decorticated with a burr, and suture anchors are placed at the 3, 4 and 5 o'clock positions. Capsular plication shifts the redundant pouch superiorly, restoring tension. Postoperatively the arm rests in a sling in slight abduction and external rotation for the first fortnight, then a graded physiotherapy programme follows.
How the exam frames it
NEET-PG questions on shoulder arthroscopy rarely ask for surgical finesse; they test portal anatomy and position-related complications. A favourite stem: a patient develops bradycardia and hypotension soon after positioning in the beach-chair position — the Bezold-Jarisch reflex, not a vasovagal episode. Another: which structure is at risk in the posterior portal — the axillary nerve and posterior circumflex humeral artery in the quadrangular space, not the suprascapular nerve. In Indian practice, mention honestly that arthroscopic anchor sets and shaver systems are concentrated in urban centres, so many candidates first meet a Bankart repair in a corporate hospital posting; government institutes increasingly stock all-suture anchors, which are cheaper, but the viva still expects you to describe the classic metallic suture anchor technique.
Frequently asked questions
Where is the posterior viewing portal created in shoulder arthroscopy?
About 1 cm medial and 2 cm inferior to the posterolateral corner of the acromion, in the soft spot of the posterior shoulder, directed toward the coracoid process.
Which complication is characteristic of the beach-chair position?
Hypotensive bradycardia from the Bezold-Jarisch reflex, plus the risk of cerebral hypoperfusion if blood pressure is inadequately monitored in the seated position.
What is a drive-through sign?
Easy passage of the arthroscope across the joint into the posterior gutter, indicating anterior capsular laxity, typically seen in instability.
Which SLAP lesion is usually treated with arthroscopic repair?
Type II, where the biceps anchor and superior labrum are detached from the superior glenoid and require re-fixation with suture anchors.
How is adhesive capsulitis treated arthroscopically?
By capsular release, chiefly anteroinferior capsulotomy, followed by gentle manipulation under anaesthesia to restore the functional arc of motion.