Arthroscopic Rotator Cuff Repair
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The Rotator Cuff muscles are those muscles that surround the shoulder joint. Their job is to provide the power to lift and rotate the arm. As one ages these muscles become thinner and are prone to rupture, sometimes with minimal trauma. In the younger patient, rupture is usually associated with significant trauma. When the Rotator Cuff tears it usually does so at the junction of the muscle with the tendon, which is the part of the muscle that inserts into the bone.
Unfortunately when the Rotator Cuff muscles tears completely they do not repair themselves. Leaving them unattended can lead to progression of the tear, in larger tears, with progressive loss of motion and power. The longer a large tear is left ,the bigger it gets and the more motion and power one loses. The surgical result is likely to be better with a smaller tear than a larger tear and thus the longer one leaves the tear unattended the less satisfactory the surgical result is likely to be.
Typically patients get severe pain with elevation of the arm, discomfort at night and a restriction in motion and power. Eventually they may lose the majority of shoulder motion.
Non operative management gives good results in smaller or partial tears providing the demand on the shoulder is not high. If, however, the tears are moderate to large or the functional deficit is significant then surgery is required.
The arthroscopic procedure gives excellent results in cases where the tear is a small to large size but the results in massive tears may not be as good as when the procedure is done as an open operation. The rehabilitation, however, may be quicker if the procedure is done arthroscopically.
An arthroscopic Rotator Cuff repair is a fairly major operation which has a six month rehabilitation period. The results are generally very good but even an excellent result does not give you a normal shoulder. The principle of the operation is to repair the torn muscle to the part of the bone from which it has become detached.
You will be admitted to the hospital on the morning of surgery and you will be visited by the anaesthetist who will examine you and make sure you are fully fit to undergo a general anaesthetic. In many cases the anaesthetist will explain to you the option of having a "block" which is an injection in and around the neck which will reduce pain for 12 to 18 hours post operatively. The nursing staff will also explain the use of "patient controlled analgesia" (or PCA) where you regulate the amount of pain relieving medication that you use. You must remove all rings from your hand prior to surgery.
The operation takes about 2 hours. The operative procedure involves 4 or 5 very small incisions around the shoulder. You may get some permanent numbness around the scars but this is usually not very noticeable. The acromion bone usually is then trimmed and the coraco-acromial ligament removed (this has no significant function). Both these structures rub on the rotator cuff and have contributed to causing the actual tear. If there is associated arthritis of the acromioclavicular joint then a small portion of bone is removed from the outer end of the collar bone (clavicle).
The rotator cuff is then inspected and the tear is repaired. We use dissolving screws with stitches and occasionally metal screws. The stitches never dissolve. To view a video of the surgery,click here.
You will wake up in the ward with your arm in a sling. Your shoulder will be reasonably numb if you have had a "block" but the "block" will wear off after which you can use the "patient controlled analgesia". You may have a device which places local anaesthetic directly into the wound over an extended period of time. Otherwise the PCA and other medications will control your pain.
After surgery do not attempt to lift or rotate the arm. It is important to sit out of bed and walk around as soon as you are comfortable and able.
The next day you will commence a PASSIVE exercise program under the supervision of a physiotherapist. The shoulder movements are performed with the un-operated arm lifting the operated arm over the head while lying down. This is done so that the repaired muscles do not contract when the shoulder is moved. The rotator cuff muscle takes 6 weeks to heal to the bone. If the muscles do contract in the first 6 weeks the repair may be torn apart. Exercises are started early to avoid stiffness of the shoulder following the operation. It is normal for the exercises to cause some discomfort.
On the day after surgery you will be discharged from hospital. In the immediate postoperative period you will experience pain about the shoulder. There will also be significant pain at night as a result of the surgery. On discharge from hospital you will be given pain killers as well as tablets to help you sleep at night.
You will need to do the passive exercises at home under your own supervision for 6 weeks. You will not need to see a physiotherapist during this period unless you have difficulty doing the exercises yourself. The exercises need to be done 4 times a day under your own supervision. The sling must remain on 24 hours a day including at night. The sling only comes off to have a shower and get dressed and on those occasions the arm needs to be kept adjacent to the body. Under no circumstances are you to elevate or rotate the operated arm. The Roads and Traffic Authority does not permit driving a vehicle while you are in a sling. I therefore recommend you do not drive for at least 4 weeks.
You will then be reviewed 6 weeks post operatively, when the sling will be removed and formal ACTIVE physiotherapy will be commenced. This is where you are allowed to lift the arm up under your own power. You will be given a set of exercises using Theraband, which is a resistive exerciser. This form of therapy, in most cases, will be supervised by a physiotherapist a couple of times a week, but it is necessary for you to do the exercises at home 4 times a day. It is not unusual to have some increase in pain when you commence the active exercise program.
You can begin lifting objects after 6 weeks but you should not lift more than 2 kg. The reason for this is that even though the rotator cuff has healed into the bone trough enough to allow you to lift your arm actively at 6 weeks, the muscle does not fully and solidly heal to the bone for 6 months.
Heavy lifting or overhead activity is not allowed for 6 to 9 months. A progressive increase in the weight restriction will take place but this will depend on your progress. Full function is allowed at 6 to 9 months providing there has been an adequate return of power.
Breaststroke swimming is allowed at about 4 months depending on your progress but you will not be allowed to swim freestyle for up to 1 year.
Physiotherapy will take at least 6 months to achieve a full or near full return of function. It is not uncommon for complete pain relief to require at least 6 to 9 months of rehabilitation following surgery.
If possible it is best never to return to jobs that involve heavy lifting and overhead activity. This is because there is intrinsic weakness in the rotator cuff and with heavy activity there is always a risk of re-rupture.The success rate of the surgery is in the vicinity of 90%. The success rate and return of function is very dependent on the size of the tear, the bigger the tear the worse the result. If you do not have surgery the tear will never heal and the tear will progressively increase in size with an associated increase in loss of function.
If you then elect to have surgery at a later date that surgery is less likely to be successful, as the size of the tear has increased. In about 10% of cases the rotator cuff does not heal and surgery fails.Even with successful surgery you will never have a normal shoulder, but you should achieve good function and excellent pain relief.