Journal of Orthopedic Research & Physiotherapy Category: Medical Type: Case Report
Arthroscopic Coblation Saucerisation of Discoid Medial Meniscus - A Novel Technique
- Edmund Ieong1*, Piyush Mahapatra2, Christopher P Huber2
- 1 Department Of Orthopedics, West Middlesex University Hospital, Twickenham Rd, Isleworth, Middlesex, TW7 6AF, United Kingdom
- 2 Department Of Orthopedics, West Middlesex University Hospital, Isleworth, Middlesex, United Kingdom
*Corresponding Author:Edmund Ieong
Department Of Orthopedics, West Middlesex University Hospital, Twickenham Rd, Isleworth, Middlesex, TW7 6AF, United Kingdom
Received Date: Sep 22, 2015 Accepted Date: Nov 12, 2015 Published Date: Dec 01, 2015
Background: Discoid medial meniscus is a rare clinical presentation, and the prevalence of lateral discoid meniscus is higher and has been more widely reported. The recommended treatment of symptomatic discoid meniscus is partial excision and saucerisation.
Case description: We report on a 29 year old male with a symptomatic medial discoid meniscus, who underwent arthroscopic saucerisation using an arthroscopic coblation technique.
Outcomes: At 5 month follow up, the patient’s symptoms of pain had completely resolved. He reported better everyday functional activities and demonstrated an improvement in knee range of motion.
Discussion: There have been many reports of discoid meniscus saucerisation using a variety of techniques. To our knowledge, there have been no reports of arthroscopic coblation for a symptomatic discoid meniscus. We describe the advantages to our technique, with reference to current literature on discoid meniscus.
The discoid medial meniscus is rare with an estimated prevalence of 0.12% . The prevalence of a lateral discoid meniscus is higher and has been reported to 1.5% . The clinical signs and symptoms of discoid medial meniscal injuries are similar to those of any other meniscal injury. Case reports and case series have recommended partial excision, rather than total menisectomy [6,9,10].
Coblation is advanced technology that quickly and effectively removes and shrinks soft tissue using radio-frequency energy. It is not a heat-driven process, and therefore surrounding healthy tissue is preserved. We describe a simple technique for saucerisation by using coblation with the Arthocare Super MultiVac 50 Arthrowand, in a rare case of a symptomatic discoid meniscus.
Plain weight bearing radiographs of the knee were initially reported as normal by the radiologist. In retrospect, following Magnetic Resonance Imaging (MRI), the radiographs had actually demonstrated subtle radiological signs of a discoid meniscus; a widened joint space, squaring of the condyles and spur formation (Figure 1).
Figure 1: Radiological features of a discoid meniscus - a widened joint space, squaring of the condyles and spur formation.
He was initially managed non-operatively, for 6 months, with activity modification, physiotherapy, and non steroidal anti-inflammatory medication. He did not experience any relief or improvement in his symptoms. Due to lack of progress a MRI scan was performed, which demonstrated a complete medial discoid meniscus (Figure 2).
Figure 2a: Magnetic resonance image of discoid meniscus (Coronal T2 weighted STIR sequence).
Figure 2b: Magnetic resonance image of discoid meniscus (Sagittal T2 PDW SPAIR proton density weighted sequence).
He was therefore referred to the orthopaedic surgeon. Our patient’s long history of significantly troubling knee symptoms had a detrimental effect on his daily activities and working life. In view of this, and his failure to progress and lack of benefit from non-operative management, he was appropriately counselled and consented for arthroscopic saucerisation of the discoid meniscus, followed by physical therapy.
Figure 3: Examination of a discoid medial meniscus.
Figure 5: The anterior rim of the discoid meniscus is easily coblated with the 50 degree Arthrowand.
Figure 6: Successful saucerisation of a medial discoid meniscus with preservation of chondral surfaces.
Figure 7: Post-operative MRI demonstrates the remaining rim of meniscus, closely resembling a ‘normal shaped meniscus’ and preserved chondral surfaces (Sagittal T2 weighted PDW SPAIR sequence).
The meniscus in the normal knee joint plays an important function, thus partial menisectomy is the preferred arthroscopic treatment of symptomatic discoid meniscus [6,14,15]. There have been many reported methods of arthroscopic partial menisectomy such as open excision, one or two piece excision, and piece-meal arthroscopic excision [3,16-18]. Piecemeal excision of a discoid meniscus can potentially be difficult to perform if working space is limited, including the need for a larger portal to remove a large piece of meniscus .
It is important to leave a rim of meniscus, free of any remaining tears. By doing so, the remaining portion performs the function of the meniscus, preventing instability from total menisectomy . The width of the remaining meniscus rim are dependent on the type of meniscus and on the shape and extent of the torn meniscus . Hayashi et al.,  left widths of 6 mm and 8 mm for complete and incomplete type lesions respectively. Ogata  would routinely leave a peripheral rim of 6 to 8 mm. Vandermeer and Cunningham  have left widths of 4 to 5 mm. We felt a width of 5 to 6 mm provided a stable rim with no impingement of the femoral condyle against the remaining rim.
Arthroscopic treatment of a complete discoid meniscus is a technically demanding procedure. The one piece excision technique described by Kim  requires a third portal, repeated changes in instrumentation, and a large portal for removal of a large piece of meniscus. Other piecemeal excision techniques can prove to be difficult and time consuming, with difficulty in initiating the excision point, frequent passage of instruments and the possibility of leaving excised meniscus in the joint .
To our knowledge, there have been no reports of arthroscopic coblation for saucerisation of a discoid meniscus. We found that there were a number of advantages to our technique compared with other described techniques. We had few changes in instrumentation when resecting a portion of the discoid meniscus. The progressive nature of resection allows constant evaluation of the amount resected and the shape of the remaining rim, whereas many other techniques involve excising the portion in one go. It also avoids piecemeal excision, which would otherwise produce free floating pieces of meniscus which need to be removed. The Arthrowand suction draws free-floating tissue to the electrodes, negating the need for chasing evasive tissue. This has the added advantage of reduced operative tourniquet times. The 50 degree angle on the coblator allows a wider degree of freedom and working angle, which we found to be suitable for shaping the meniscus. Post-operative MR scans demonstrate the remaining rim of meniscus, closely resembling a ‘normal shaped meniscus’ and preserved chondral surfaces (Figure 7). This technique is theoretically reproducible with different manufactures of coblators. Our reasons for using the Arthrocare Arthrowand Super Vac 50 was due to surgeon training/familiarity and product availability as well as some of the features of this product. The estimated temperature at the tip of the instrument is 20-60 degrees centigrade. Safety features include a 100μm - 200μm plasma field allows for precise removal of soft tissue with minimal damage to untargeted tissue. Nevertheless meticulous technique and care must still be taken to avoid iatrogenic damage. Various manufacturers offer different technologies to the safety and efficacy of their products, but it is not within the scope of this article to discuss further. Although this is presented as a new technique for a rare condition, we see no reason why this technique may not be applied to more common presentations, such as a lateral discoid meniscus or meniscal tears, but strongly advocate proper training and education in the use of such instruments. We also eagerly await the long terms results following our use of this technique to confidently confirm adequacy of resection and the benefits and safety of this technique.
In summary, we have demonstrated a simple technique for the saucerisation of a medial discoid meniscus which is easy and quick to perform in comparison with other known techniques.
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Citation:Ieong E, Mahapatra P, Huber CP (2015) Arthroscopic Coblation Saucerisation of Discoid Medial Meniscus - A Novel Technique. J Orthop Res Physiother 1: 017.
Copyright: © 2015 Edmund Ieong, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.