Faculty Bibliography

Trauma series radiographs of 50 proximal humerus fractures were used to assess the relative contribution of the scapular lateral and axillary radiographs to fracture classification with the Neer system. The radiographs were reviewed by an orthopaedic shoulder specialist, on orthopaedic traumatologist, a skeletal radiologist, and orthopaedic residents in their fifth and second years, respectively, of postgraduate training. In the first viewing radiographs were reviewed and classified in the following sequence: (1) after scapular anteroposterior view alone; (2) after review of scapular anteroposterior and lateral views; and (3) after review of scapular anteroposterior, lateral, and axillary views. A second viewing of the same 50 cases was performed 6 months later in a changed sequence: (1) after scapular anteroposterior view alone; (2) after review of scapular anteroposterior and axillary views; and (3) after review of scapular anteroposterior, axillary, and scapular lateral views. For the five observers, review of the scapular anteroposterior and axillary views achieved the final classification in 99% of cases. However, after review of the scapular anteroposterior and lateral views, the final classification was achieved in only 79% of cases (p < 0.05). These results indicate that when combined with the scapular anteroposterior radiograph, the axillary view contributes significantly more to fracture classification with the Neer system than the scapular lateral radiograph.

Hip fractures remain a major source of morbidity and mortality in the elderly, and their incidence is increasing as the population ages. Surgical management followed by early mobilization is the treatment of choice for most patients with hip fractures. However, all comorbid medical conditions, particularly cardiopulmonary and fluid- electrolyte imbalances, must be evaluated and stabilized prior to operative intervention. Nondisplaced femoral-neck fractures should be stabilized with multiple parallel lag screws or pins. The treatment of displaced femoral-neck fractures is based on the patient's age and activity level: young active patients should undergo open reduction and internal fixation; older, less active patients are usually treated with hemiarthroplasty, either uncemented or cemented. Regardless of treatment method, the goal is to return the patient to his or her prefracture level of function

Surgical stabilization followed by early mobilization is the treatment of choice for both nondisplaced and displaced intertrochanteric fractures. Fracture stability is dependent on the status of the posteromedial cortex. The sliding hip screw is the device mostly commonly used for fracture stabilization. The most important aspect of its insertion is secure placement within the femoral head. Although the sliding hip screw allows postoperative fracture impaction, it is essential to obtain an impacted reduction at the time of surgery. If there is a large posteromedial fragment, an attempt should be made to internally fix the fragment with a lag screw or cerclage wire. Although intramedullary hip screws have not been shown to be superior to the sliding hip screw, they may have selected indications

Fifty embalmed human tibias were osteotomized to create a simulated vertical shear (supination-adduction) fracture of the medial malleolus and were stabilized using one of five internal fixation techniques. In offset axial testing, which simulated supination-adduction loading, the fixation strength of tibias stabilized with either cortical or cancellous lag screws placed perpendicular to the osteotomy was over five times greater than the strength of those treated with an antiglide plate and nearly two and a half times greater than those treated with cancellous lag screws placed oblique to the osteotomy. The tibias stabilized with cancellous lag screws placed perpendicular to the osteotomy exhibited twice the fixation strength of the tibias stabilized with an antiglide plate and distal lag screw. The tibias stabilized with an antiglide plate and distal lag screw and perpendicularly placed cortical or cancellous lag screws demonstrated three times greater resistance to displacement to the applied supination-adduction load than those stabilized with an antiglide plate alone. In offset transverse testing, to simulate loading in external rotation, the mean failure load of the tibias stabilized with cancellous lag screws placed perpendicular to the osteotomy was over two and a half times greater than those stabilized with an antiglide plate and distal lag screw. No significant differences were observed in the resistance to displacement for these tests. These results support the use of lag screws placed perpendicular to the fracture surface for stabilization of vertical shear fractures of the medial malleolus and indicate that the use of an antiglide plate, with or without a distal lag screw, does not offer any advantage over lag screw fixation

A clinical and histological study was performed on fracture blisters found in association with 13 surgically treated ankle fractures. The timing of surgery was dependent upon soft tissue swelling; the status of the blister did not affect this aspect of the decision making process. The average time from injury to surgery was 2.1 days (range, 1-3 days). At the time of surgery all blisters were intact. Skin biopsies were obtained from the edge of the incision in proximity to the blister, and from the bed of the blister when the incision was made through the blister. Clinically, 2 blister types were identified: (1) clear fluid filled, and (2) blood filled. Histologically, both blister types demonstrated a cleavage injury at the dermoepidermal junction. However, the dermis of the clear fluid filled blister retained occasional epithelial cells, while the dermis of blood filled blisters was completely devoid of epidermis. Minimal to no evidence of dermal injury was found in histologic sections from the blister beds or from the skin in close proximity to blisters. All incisions made through and around skin blisters went on to heal without evidence of infection or wound breakdown. Delayed wound healing occurred in 1 patient in whom an incision was placed through a blood filled blister. The blood filled blister appears to represent a slightly deeper injury than the clear fluid blister and had a higher risk of poor healing of surgical incisions

Fourteen patients with Stage II or III impingement syndrome (average age 58 years) were studied. Nine patients had full-thickness rotator cuff tears documented by arthrograms. Patients initially underwent a thorough shoulder examination followed by baseline isokinetic strength testing. Abduction/adduction testing was performed utilizing a Biodex dynamometer. Maximum concentric contractions were performed, and values for peak torque (PT), total work (W), and power (P) were obtained. All patients received a subacromial injection of 5 cc 1% lidocaine plus 5 cc 0.5% bupivacaine (Marcaine). After 5 minutes the testing sequence was repeated. Clinically, patients demonstrated marked improvement following injection. Eighty-six percent reported complete pain relief; the remaining two patients reported only mild discomfort at the extremes of motion. Improvement in functional activity of the affected shoulder was noted by all subjects. On manual muscle testing, 13 of 14 patients (93%) demonstrated increased abduction strength; 11 of 14 (79%) had improvement in external rotation. Mean increases in active forward elevation and external rotation were 36 degrees and 11 degrees, respectively (P < .01). Postinjection isokinetic changes in PT, W, and P for abduction/adduction were dramatic. For abduction, all patients showed significant increases in P (mean 82%), W (mean 90%), and PT (mean 48%) (all P < .05). No significant differences in range of motion testing or strength parameters were noted based on the presence or absence of a rotator cuff tear. For adduction, all patients showed significant increases in P (mean 208%), W (mean 183%), and PT (mean 41%) (all P < .05).(ABSTRACT TRUNCATED AT 250 WORDS)

Our hospital implemented an integrated cost-containment program designed to address the increasing disparity between the cost of orthopaedic implants used for total joint replacements and the amount of hospital reimbursement provided for these procedures. This program was divided into four phases: (1) the analysis of the specific usage of total hip and total knee implants at our institution, (2) the development of surgeons' awareness of the problem and the enlistment of their participation in the process of cost containment, (3) the initiation of a competitive bidding system to select standard prostheses that would be available for general use within the institution, and (4) the establishment of a prosthesis-utilization committee to monitor the process and to make decisions concerning the use of non-standard prostheses. Using this cost-containment program, our hospital greatly reduced the number of vendors and implant systems used; all implants were purchased on a consignment basis, which minimized the cost of implant inventory. The average cost reductions in the first year were 14 per cent for total hip implants and 24 per cent for total knee implants. Over-all implant costs were reduced by an estimated $706,477, or 23 per cent of the budget for implants for the previous year

A biomechanical cadaver study was performed to compare the stability and ultimate strength of 3 standard fixation techniques used for treatment of basicervical hip fractures. Twenty one pairs of mildly osteoporotic femurs were selected, based on a computed tomography bone density reading of 40-50 Hounsfeld units and a Singh index of III. After initial mechanical characterization of intact femurs, basicervical femoral neck fractures were created, reduced, and then instrumented with random assignment to 1 of 3 methods of fixation: (1) 3 parallel 6.5-mm cannulated cancellous screws; (2) a 135 degrees sliding hip screw with a 4 hole side plate; and (3) a 135 degrees sliding hip screw with a 4 hole side plate and a 6.5-mm cannulated cancellous screw placed proximal and parallel to the sliding screw. Nine pairs were tested to failure in axial loading, 6 pairs in lateral bending, and 6 pairs in torsion. The group instrumented with the multiple cancellous screws had a significantly (p < 0.01) lower ultimate axial load to failure than either sliding hip screw group. However, the multiple screws demonstrated significantly (p < 0.01) less fracture displacement. There were no statistically significant differences in lateral bending or torsional testing behavior between the 3 fixation methods. Use of the sliding hip screw is recommended rather than use of multiple cancellous screws for treatment of basicervical femoral neck fractures. Although a superiorly located cancellous screw may provide rotational control during sliding hip screw insertion, it provides no incremental fixation after the sliding hip screw is placed