RT Journal A1 Bell, Douglas A1 Pedersen, Elizabeth T1 Lateral Transfer of the Medial Hamstring Tendons to the Fibula to Treat Anterolateral Rotatory Instability of the KneeA Case Report JF The Journal of Bone & Joint Surgery JO The Journal of Bone & Joint Surgery YR 2009 FD May 1 VO 91 IS 5 SP 1214 OP 1218 DO 10.2106/JBJS.H.00420 UL http://dx.doi.org/10.2106/JBJS.H.00420 AB Anterolateral rotatory instability, or anterior-internal rotation instability, is typically associated with deficiency of the anterior cruciate ligament1-3. In fact, anterior cruciate ligament insufficiency has been called the sine qua non of anterolateral rotatory instability. Many techniques were described to reduce this anterolateral laxity with use of extra-articular tenodesis or tendon transfers1,2,4,5 before intra-articular techniques were developed6,7. We present the case of a patient who, as a result of traumatic loss of the lateral thigh muscles, had anterolateral rotatory instability of the knee without anterior cruciate ligament deficiency; this condition was treated with a lateral transfer of the gracilis and semitendinosus tendons to the fibula. To our knowledge, this technique has not been described previously in the English-language literature. Our patient was informed that data concerning the case would be submitted for publication, and he consented.