High tibial osteotomy is commonly performed for varus/ valgus misalignment of the knee. Altering the sagittal plane can affect the forces of the cruciate ligaments and influence stability. This retrospective study looked at the alteration of the tibial slope produced by closed wedge osteotomy, in which the importance of the sagittal plane is often overlooked.

We followed-up 67 of 80 patients admitted for high tibial osteotomy or removal of hardware between January and September 2001. The mean age of the 41 men was 36.6 years (17 to 67) and of the 26 women 39.4 years (19 to 62).

On preoperative radiographs the mean slope was 6.1( (0( to 12(). The frontal plane was changed by a mean of 7.93( (2( to 12(). A closed wedge osteotomy decreased the slope by a mean of 4.88( (0( to 10( posteriorly and 0( to 6( anteriorly). Alteration of the coronal plane by 6( decreased the slope by 4.29(, 8( by 7(, 10( by 4.75( and 12( degrees by 6.5(.

A closed wedge osteotomy decreases the tibial slope. This causes an anterior shift in the starting position of the tibia, potentially decreasing in situ forces acting on the anterior cruciate ligament. There was no correlation between the correction of the coronal plane and alteration of the sagittal plane.

It is suggested that there is a link between overuse injuries and the type of arch of the foot, and that the use of appropriate running shoes may reduce running injuries substantially. However, to select the correct shoe, a runner needs knowledge of the anatomy and biomechanics of his/her foot.

Five orthopaedic surgeons and experienced orthopaedic technicians examined the feet of 92 runners of mean age 35.4 years (12 to 63), mean height 176 cm (154 to 195) and mean body weight 70.38 kg (45 to 95). Weight-bearing podograms were used to define deformities of the feet further. A questionnaire ascertained what runners knew about their arch heights and the biomechanics of running. Of 43 volunteers with normal arches, 25 correctly assessed their feet, but only 18 of 47 runners with a flatfoot deformity identified their deformity. Two runners with a cavus foot identified it correctly. Only four of 38 runners who diagnosed themselves as pronators were found to be, and four runners who self-diagnosed non-pronation were classified as pronators. Three runners who could not classify themselves were diagnosed as pronators.

This study demonstrates the poor knowledge of foot deformities in the running community.

Osteochondral autologous transplantation (OATS) is a new technique for the treatment of osteochondral defects.

In a prospective randomised study, between November 1996 and June 2000 we used the OATS technique to treat 136 patients (90 male, 46 female) with a mean osteochondral defect of 3.3 cm2. The defect was in the medial femoral condyle in 54 cases, the lateral femoral condyle in nine, the patella in 15, the trochlea in six, the tibial plateau in one, the talus in 29, the tibial plafond in two, the capitellum in four. There were 16 other locations. The procedure was performed either open or arthroscopically. A mean of 2.2 cylinders was transplanted. At the same time, we treated malalignment by high tibial osteotomy (HTO) in 20 patients, and instability by anterior (ACL) or posterior cruciate ligament (PCL) reconstruction in 16. Five patients required reconstruction of both ACL and PCL.

The Lysholm score in the lower limbs increased from a preoperative mean of 58.3 (20 to 77) to a mean of 90.2 (70 to 100). Treatment by OATS alone increased the score from 62.9 to 91.6. The combination of OATS and HTO increased the score from 65.2 to 91.6. With additional ACL/PCL reconstruction, the score increased from 49.9 to 82.6. The combination of OATS, HTO and ACL/PCL reconstruction increased the Lysholm score from 55.5 to 85.5. Control postoperative MRI with IV contrast (Gd-DTPA) showed incorporation of all but one cylinder. Complications included one case of arthrofibrosis and sinking of one cylinder. One patient developed regional pain syndrome and three had pain at the malleolar osteotomy site, resolved by screw removal. For four weeks after the operation, 10% of patients complained of pain at the donor side in the lateral femoral condyle. There were no complications related to OATS performed in the upper limbs, and control MRI three months postoperatively showed incorporation of all cylinders.

The results are encouraging, and give rise to the hope that this cost-effective and safe new treatment for limited osteochondral defects may delay or even prevent the onset of osteoarthritis.

Knee trauma often causes meniscal injuries. Only 15% of all tears can be repaired. Partial or complete meniscectomy subsequently leads to an increased incidence of chondral damage and onset of early osteoarthritis. In Europe in 1999, 355 000 meniscal injuries were treated, 284 000 of which required partial or complete meniscectomy

As an alternative to allograft, the collagen meniscus implant (CMI®) can be used for reconstruction. A collagen matrix moulded in the form of a meniscus, this is trimmed to defect size and sutured into place arthroscopically. It then serves as a scaffold for cellular invasion. Indications are tears that require partial meniscectomy or an intact remnant stable meniscus. Cruciate ligament injuries, malalignment, osteoarthritis and stage-IV osteochondral defects are the principal contraindications.

Between July 1998 and March 2000, 10 patients received a CMI in our department. Additional pathologies (four anterior cruciate ligament (ACL) injuries, four varus malalignments and five chondral defects) were treated simultaneously. The Lysholm score increased from 70 to 99 in patients treated with an additional high tibial osteotomy (HTO), from 58 to 91 in the group with ACL reconstruction, from 71 to 93 in patients with osteochondral autologous transplantation (OATS). The Lysholm score of the combined group (two patients with HTO and OATS, two with HTO and ACL reconstruction) improved from a preoperative 69 to 99 postoperatively.

CMI, a biocompatible resorbable implant, induces cellular ingrowth and arthroscopic implantation. However, there are still questions to be answered. Few cases have been reported and no long-term studies have yet been published. It is not yet known whether osteochondral defects, unstable joints or malignment are limitations of using the implants.

Large osteochondral defects are difficult to treat, but several treatment options are available. The posterior condyle transfer salvage technique described by Wagner in 1964 and Imhoff in 1990 has been developed further, and is now used for coverage of large osteochondral defects in the load-bearing zone. The new technique is called MEGA-OATS.

From July 1999, 17 patients of mean age 39 years (16 to 6) were treated by MEGA-OATS. Two patients additionally underwent high tibial osteotomy and two bone grafting, using bone harvested from the proximal tibia. The mean follow-up was 12 months. The technique calls for excision of the posterior femoral condyle, which is placed in a specially designed work station. A MEGA-OATS cylinder of diameter 20 mm to 35 mm is prepared and, using the press-fit technique, grafted into the prepared defect zone.

The Lysholm score increased postoperatively from 63 (49 to 71) to 81 (72 to 85). Three months postoperatively control MRI showed incorporation of all cylinders. Between six and 12 weeks postoperatively, patients attained a full range of motion and became fully weight-bearing. To date no postoperative complications or meniscal lesions of the posterior horn have been observed.

MEGA-OATS achieves a congruent reconstruction of the articular surface in the load-bearing zone of the femoral condyle. We consider it a good alternative in the treatment of large osteochondral defects of the femoral condyle in young patients.