Solapur Condylar Screw

Added Nov 25, 2010

Manufactured by Orthodeal

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Categorised under: Orthopaedics > Trauma > Compression screws

Reviews

Reviewed by Dr B Shivashankar MS Orth Reviewed Nov 29, 2010

Iyer Orthopaedic Centre, Solapur, India - Declaration of Interest: The author was involved in the design of the device.

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The Solapur Condylar Compression Cannulated Screw is a 6.5mm screw placed over a guidewire which can provide compression in clinical situations where a screw might pull out of the bone. The screw is compatible with standard ASNIS screw instruments.

The author has no financial or other pecuniary interest in the device or device manufacturer reviewed, but was involved in its design.

Device features

The Solapur Condylar Compression Cannulated Screw is a 6.5mm screw placed over a guidewire which can provide compression in clinical situations where a screw might pull out of the bone. The screw is compatible with standard ASNIS screw instruments.

The device in use

For intra articular fractures of the condyles of femur and tibia, the regular 6.5mm cannulated screw is the implant of choice for articular reduction and interfragmentary compression. The amount of compression determines the quality of intra-articular reduction and in turn joint mobilization. In many instances in cases of comminuted fractures or bicondylar fractures, bone fragments are small, good purchase of the threads of the cancellous screw is difficult and hence the fracture cannot be adequately compressed. When attempting to compress a fracture, the hold of the threads can be lost. To address the problem of having good compression in comminuted fractures with smaller fragments, the “Solapur Condylar Compression Cannulated Screw” was designed. This screw can be compressed from either side and the hold of the threads is not a pre requisite, as fragments can be compressed using a washer against the cortex.

For ease of use, the screw was designed to be compatible with the ASNIS Hip screw (the shaft and threaded portion), so that drilling and tapping can be carried out with the cannulated drill bit and tap of an ASNIS set. A screw compatible with the compression screw from a sliding hip screw can be introduced from the other side over the guidewire. Compression can be obtained by tightening this screw.

Technique in Brief

After fracture reduction, a guide wire is passed across the fracture and drilling carried out with cannulated drill bit. The near cortex is then tapped with an ASNIS tap and a Solapur Condylar Compression screw about 10 mm shorter is selected. From the other side the top screw with a washer is passed over the guide wire and the fragments are compressed by tightening the top screw. The screw can be used in isolation or with a plate if appropriate.

Results so far

Although we have not formally published our results, this implant has been used in our centre for the last 5 to 6 years with satisfactory results in around 20 cases. We have not seen any failures, and excellent compression has been obtained. In one case, the screw produced compression across a 3 week old split condylar fracture. In another case, the head of the screw was prominent on the medial side and had to be removed subsequently but without long-term disability.

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