Muhammad Khan Pahore, Muhammad Ayub Laghari, Asad Ullah Makhdoom, Mehtab Pirwani, Irshad Ahmed Bhutto, Prof Abdul Rehman Shaikh.
Evaluation of risk of lag screw cut out in unstable intertrochanteric fractures.
J Liaquat Uni Med Health Sci Jan ;10(3):157-62.

OBJECT: To evaluate the risk of lag screw cut out in unstable intertrochanteric fractures. MATERIAL & METHODS: This study was conducted in the Department of Orthopedic Surgery and Traumatology (DOST) Liaquat University of Medical & Health sciences Jamshoro from January 2006 to December 2009. Unstable intertrochanteric fractures type A2 & A3 of AO classification fixed with DHS in stable (anatomic & wayn county) reduction, were included in study. All patients were assessed on six months follow up x-rays for cut out failure in different positions for placement of screw in femoral head. For placement of screw, femoral head was divided in 9 columns/zones on antero-posterior & lateral plane x-rays. RESULTS: Out of total 66 study subjects 45 (68.1%) were males and 21 (31.8%) were females, 56 (84.8%) were of A2 and 10 (15.2%) of A3 type. Mean age was 65.41 years. Forty (60.6%) patients were fixed in anatomical reduction and 26 (39.3%) in wayn county reduction. The screw placement was 24 (36.3%) in central –central, 9 (13.6%) in central –inferior, 17 (25.7%) in posteriorinferior and 16 (24.2%) in remaining off central (unsatisfactory) zones. The cut out was in 2 patients ( 8.3% ) in central-central , 0% in central inferior position , 3 patients (17.6%) in posterior inferior and 4 patients (25%) in remaining off central zones (all cut out were in superior zones of femoral head). CONCLUSION We conclude that placement of lag screw in inferior on AP and central on lateral view in femoral head gives excellent results after achieving stable reduction, having maximum bone to plow for cut out. But it is difficult and time consuming so if it is aimed in lower half on AP and central on lateral view in femoral head it will give better results.

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