The instability severity index score

The Journal of Bone and Joint Surgery (Br) 2007 89: 1470-1477.
不安定性の重症度スコア
肩関節の安定化に際し鏡視下手術か直視下手術かを選択するための簡易術前スコア
The instability severity index score
A simple pre-operative score to select patients for arthroscopic or open shoulder stabilization
By F. Balg, MD, FRCSC*, and P. Boileau, MD
Abstract:
There is no simple method available to identify patients
who will develop recurrent instability after an arthroscopic Bankart procedure and who would be better served by
an open operation.
We carried out a prospective case-control study of 131
consecutive unselected patients with recurrent anterior
shoulder instability who underwent this procedure using suture anchors. At follow-up after a mean of 31.2
months (24 to 52) 19 (14.5%) had recurrent instability.
The following risk factors were identified: patient age
under 20 years at the time of surgery; involvement in
competitive or contact sports or those involving forced
overhead activity; shoulder hyperlaxity; a Hill-Sachs
lesion present on an anteroposterior radiograph of the
shoulder in external rotation and/or loss of the sclerotic
inferior glenoid contour.
These factors were integrated in a 10-point pre-operative instability severity index score and tested retrospectively on the same population. Patients with a score over
6 points had an unacceptable recurrence risk of 70% (p
< 0.001). On this basis we believe that an arthroscopic
Bankart repair is contraindicated in these patients, to
whom we now suggest a Bristow-Latarjet procedure
instead.
Reproduced with permission and copyright of The British Editorial Society
of Bone and Joint Surgery [J Bone Joint Surg Br. 2007; 89: 1476]
要 約:
鏡視下 Bankart 修復術後に不安定性の再発を生じ,
直視下手術を選択すべきであったと考えられる患者を同
定するための簡便な方法はない.
反復性肩関節前方不安定症に対し,スーチャーアン
カーを用いて Bankart 修復術を施行した連続した 131
例全例を対象に,後ろ向き症例対照研究を実施した.平
均 31.2(24 〜 52)ヵ月後に行った追跡調査時には,19
例(14.5%)に不安定性の再発が認められ,以下の危険因
子が同定された;手術時の年齢が 20 歳未満,競技スポー
ツやコンタクトスポーツ,頭上動作を強いられる活動へ
の参加,肩関節の過弛緩,外旋位肩関節の X 線前後像
で認められる Hill-Sachs 病変または関節窩前下硬化縁
の消失あるいはその両方.
これらの危険因子を,10 点法の術前不安定性重症度
スコアに組み入れ,同一集団で後ろ向きに検討した.ス
コアが 6 点を超えた患者では,再発リスクが許容範囲
を超える 70% と高かった( p < 0.001).この結果から,
われわれは,このような患者に鏡視下 Bankart 修復術
は禁忌であると考え,現在はその代わりに BristowLatarjet 法を推奨している.
* Department of Orthopaedic Surgery, Centre Hospitalier
Universitaire de Sherbrooke, 3001, 12e Avenue Nord,
Sherbrooke, Quebec, Canada J1H 5N4.