Osteochondral Fractures of the Knee in Skeletally Immature Patients: Short-Term Results of Operative Fixation using Omnitech Screws.

PURPOSE OF THE STUDY: Retrospective case series looking at the use of Omnitech compression screws for the management of osteochondral fractures in skeletally immature patients. MATERIAL AND METHODS: Nine patients with a mean age of 14 were included in the study with a mean follow up of 26 months. RESULTS: The average KOOS, IKDC and Tegner Lysholm Scores were 86.7, 90.34 and 96.1 respectively. CONCLUSION: The use of Omnitech screws in the acute setting for skeletally immature patients shows excellent short-term outcomes.

Osteochondral fractures of the knee in skeletally immature patients: short term results of operative fixation using Omnitech screws.

PURPOSE: Osteochondral fractures in skeletally immature patients are rare. A retrospective case series is reported looking at the use of Omnitech compression screws for these injuries. METHOD: Nine patients with a mean age of 14 were included in the study with a mean follow up of 26 months. RESULTS: The average KOOS, IKDC and Tegner Lysholm Scores were 86.7, 90.34 and 96.1 respectively. CONCLUSION: The use of Omnitech screws in the acute setting for skeletally immature patients shows excellent short-term outcomes.

Case series of 17 modified Weil's osteotomies for Freiberg's and Köhler's II AVN, with AOFAS scoring pre- and post-operatively.

BACKGROUND: Treatment for metatarsal head avascular necrosis is largely conservative. For severe or refractory cases there are various surgical options. METHODS: We have performed a 'modified Weil's osteotomy' of the distal metatarsal in order to manage this problem. We present the largest case series, to our knowledge, with 17 such cases. The patients were scored pre- and post-operatively using the AOFAS Forefoot scoring system. RESULTS: We found that this procedure provided a mean score improvement of 36 points, with a complication rate of 5.9%. CONCLUSION: We would advocate this modified osteotomy as an effective, reliable and safe treatment option.

Increased mortality among patients sustaining hip fractures requiring surgery in a district general hospital.

Fractures of the femoral neck are a common condition the incidence of which continues to rise. Associated mortality remains very high and knowledge of factors contributing to this high mortality is crucial in understanding outcome for both patient and surgeon. A retrospective review of 1254 patients operated on for fracture neck of femur was conducted to identify mortality at 30 days, 90 days and one year. Age, type of fracture, sex and waiting time for surgery were evaluated along with mortality for 47 patients who sustained their fracture while already inpatients with other concurrent illnesses. Those patients who sustained an inpatient fracture were found to have significantly higher mortality at 30 days, 90 days and one year. We concluded that these patients represent a very high-risk group that needs special consideration in management of their fracture and concurrent medical condition to reduce their high mortality.

Infection in knee replacements after previous injection of intra-articular steroid.

We reviewed 231 patients who had undergone total knee replacement with an AGC (Biomet) implant over a period of 2.5 years. After applying exclusion criteria and with some loss to follow-up, there were 144 patients available for study. These were divided into two groups; those who had received intra-articular steroid in the 11 months before surgery and those who had not. There were three deep infections, all of which occurred in patients who had received a steroid injection. The incidence of superficial infection was not significantly different in the two groups. Five patients had undergone investigation for suspected deep infection because of persistent swelling or pain and all of these had received an intra-articular injection pre-operatively. We conclude that the decision to administer intra-articular steroids to a patient who may be a candidate for total knee replacement should not be taken lightly because of a risk of post-operative deep infection.

Polyethylene wear rates with Zirconia and cobalt chrome heads in the ABG hip.

We report a radiological analysis of 281 primary cementless ABG total hip arthroplasties performed between 1991 and 1994, with a mean follow-up of 78 months. We compare the polyethylene wear in hips with Zirconia ceramic heads manufactured prior to the introduction of hot isostatic pressing and hips with cobalt chrome heads. The mean linear wear rate was 0.19 mm/yr with 28mm Zirconia heads (n=203), 0.20 mm/yr with 32mm Zirconia heads (n=47) and 0.14mm/yr with 28mm cobalt chrome heads (n=31). We matched each of the 31 patients with 28mm cobalt chrome heads with a patient from the 28mm Zirconia group for gender and age. The mean linear wear rates in these two groups were 0.14mm/yr and 0.19mm/yr respectively (p<0.05). There were 19 revisions for osteo-lysis in 250 hips with Zirconia heads (7.6%) and no revisions in 31 hips with metal heads. We advocate regular review of patients with Zirconia on polyethylene bearing surfaces due to the high linear wear rates and associated osteolysis. (Hip International 2005; 15: 63-70).

Early failure of the porous-coated anatomic cemented unicompartmental knee arthroplasty: A 5- to 9-year follow-up study.

This retrospective study analyzed the results of 26 porous-coated anatomic unicompartmental knee arthroplasties to determine the failure rate, the mode of failure, and the presentation of the failure. The mean follow-up was 6.9 years. All patients were assessed using the American and Oxford knee scores. The revision rate was 42%4, with a mean revision time of 38.4 months. The commonest presentation of failure included pain (100%), decreased mobility (75%), swelling (58%), and giving way (50%). The commonest modes of failure included femoral loosening (55%), polyethylene wear (55%), loosening and polyethylene wear (72%), and fracture-dislocation of the femoral prosthesis (18%). The 42% failure rate of the porous-coated anatomic unicompartmental knee arthroplasty necessitates regular surveillance and prompt revision, if failing, to avoid osteolysis.

Intravenous polymethyl methacrylate after cemented hemiarthroplasty of the hip.

Current cementing techniques used during hip arthroplasty aim to maximize the bond at the bone-cement interface in an effort to increase the longevity of the prosthesis. To accomplish this, one must generate high intramedullary pressures, which are known to be associated with complications such as cement implantation syndrome. We record a rare complication following cement pressurization of a hip hemiarthroplasty that resulted in intravenous polymethyl methacrylate (PMMA). This complication however, is not associated with a significant morbidity or mortality, but it is important to identify and distinguish from a femoral cortical defect, which can be created during surgery.

Psoas major and its controversial rotational action.

The action of psoas major muscle as a primary flexor of the hip joint is undisputed. However it is also variably reported as being a medial and a lateral rotator of the femur at the hip joint. The psoas and iliacus muscles, along with their common insertion, were isolated by dissection in six adult cadaveric specimens. The action of psoas muscle was assessed by pulling the muscle along its long axis and then observing the effects on rotation of the femur, with a visual estimation of the rotation in degrees. The experiment was repeated with the hip joint capsule removed. In the anatomical position, applied traction along the long axis of the muscle produced hip flexion with no rotational component. With the hip in the abducted position, traction produced flexion, adduction, and lateral rotation of the femur at the hip joint. In adduction of the hip, traction on psoas produced only flexion at the hip joint, with no rotation. In maximal flexion, traction also produced adduction. The results were unaffected by the removal of the joint capsule.