Execution
- 1Position the patient supine with the hip flexed and the knee flexed to 90 degrees.
- 2Stabilize the patient's foot and sits on it if needed.
- 3Rotate the tibia medially or laterally depending on the rotatory instability being tested.
- 4Apply an anterior drawer force to the proximal tibia.
- 5Compare tibial translation and rotation with the opposite knee.
Positive outcome
Excessive anterior translation with rotation is positive. The rotational direction helps classify anterolateral or anteromedial rotatory instability. The test is historical and should be interpreted with ACL, collateral, and capsule findings.
Studies
| Study | Reliability | Sn | Sp | LR+ | LR− |
|---|---|---|---|---|---|
| Slocum et al. (1976) | NA | NA | NA | NA | NA |
CommentSlocum testing is part of the older rotatory instability classification system. Magee notes that direction of instability does not mean only structures on that side are injured. Modern validation is limited, so this is mainly a classification and descriptive laxity test.
Low Clinical Value