When ligaments that hold the AC ( acromioclavicular ) joint together are partially or completely torn, the outer end of the clavicle may slip out of place, preventing it from properly meeting the scapula.

The acromioclavicular joint, or AC joint, is a joint at the top of the shoulder.

It articulates with the clavicle ( collar bone ) to form the acromioclavicular joint.

The acromioclavicular joint, the joint between the acromion process on the scapula and the clavicle, is similarly strengthened by strong ligaments, especially the coracoclavicular ligament which prevents excessive lateral and medial movements.

After an unsuccessful offseason rehab, Notre Dame sent Beuerlein to a California orthopedist in April, where the doctor discovered a bone chip in his collarbone, which had ground away much of his acromioclavicular joint.

Doctors also removed a cyst from his acromioclavicular joint.

The lateral end connects at the acromion of the scapula which is referred to as the acromioclavicular joint.

It does not properly belong to the acromioclavicular joint articulation, but is usually described with it, since it forms a most efficient means of retaining the clavicle in contact with the acromion.

Arthroscopy is commonly used for treatment of various diseases of the shoulder including subacromial impingement, acromioclavicular osteoarthritis, rotator cuff tears, frozen shoulder ( adhesive capsulitis ), chronic tendonitis and partial tears of the long biceps tendon, SLAP lesions and shoulder instability.

Distal clavicular osteolysis ( DCO ) is often associated with problems weightlifters have with their acromioclavicular joints due to high stresses put on the clavicle as it meets with the acromion.

The acromioclavicular articulation consists of the acromioclavicular ligament and a small disk of cartilage located in between the acromion and the clavicle.

* The acromioclavicular ligament, which attaches the clavicle to the acromion of the scapula.

There are three joints of the shoulder: The glenohumeral, acromioclavicular, and the sternoclavicular joints.

Some portions of the acromioclavicular ligament may still remain attached.

acromioclavicular ligament.

* Acromioclavicular joint ( AC joint ), the shoulder junction between the scapula and the clavicle

When the Hurlock family finally sold up in 1986 Angliss fully acquired the AC trademark rights and set up a new AC company as a joint venture with Ford, who had also recently bought Aston Martin.

In 2007 AC announced a joint venture with Brooklands Motor Company ( the spiritual successor of Autokraft ) in Weybridge, Surrey, UK and confirmed plans for the continuation of the traditional AC designed tubular chassis and aluminium bodied models.

In April 2009, a joint venture in Germany was announced to manufacture the new AC MKVI.

In 2010 AC announced a joint venture with the USA based company Iconic which resulted in the design of the ultimate ' Cobra ' the ' Iconic AC Roadster '

The ensuing settlement resulted in Shelby and AC Cars / Angliss releasing a joint press release whereby AC / Angliss acknowledged that Carroll Shelby was ( and is ) the manufacturer of record of all the 1960s AC Cobra automobiles in the United States and that Shelby himself is the sole person allowed to call his car a Cobra.

Nonetheless, production of the Mk IV continued, from 1987 as a joint venture with Ford as the AC Mk IV with a at 4, 200 rpm, 4, 942 cc Ford V8 which provided a top speed of and 0 – 100 km / h in 5. 2 seconds.

Shoulder pain or tenderness and, occasionally, a bump in the middle of the top of the shoulder ( over the AC joint ) are signs that a separation may have occurred.

Often a crossover arm test is utilized in diagnosis because this compresses the AC joint, exacerbating the symptoms.

* AC Environmental Studies ( joint degree with University of Applied Science Nürtingen )

It is a joint venture of Mohun Bagan AC, The Academy Campus and the Steel Authority of India Limited.

In 1997, a joint industry body appointed TAM ( backed by AC Nielsen ) as the official recordkeeper of audience metrics.

Established in 1980 as a joint powers authority, CCCTA assumed control of public bus service within central Contra Costa first begun by Oakland-based AC Transit as it expanded into suburban Contra Costa County in the mid-1970s ( especially after the opening of BART ).

He missed nineteen of the final twenty games of the season with biceps tendonitis and a sprained AC joint, and on September 26 he had surgery to remove bone spurs and chips from his right elbow.

* NOVA FM-( Hot AC ) Hit music-is the joint channel of TV2 and SBS.

He had surgery immediately, which removed an inch of his collarbone and the entire remaining parts of his AC joint.

Whether by virtue of their actual or ostensible authority as agents acting within their authority ( see Lloyd v Grace, Smith & Co. AC 716 ) or as employees acting in the course of their employment ( see Armagas Limited v Mundogas S. A. 1 AC 717 ), their acts and omissions and their knowledge could be attributed to the company, and this could give rise to liability as joint tortfeasors where the directors have assumed responsibility on their own behalf and not just on behalf of the company.

In mathematics, the axiom of choice, or AC, is an axiom of set theory equivalent to the statement that " the product of a collection of non-empty sets is non-empty ".

The debate is interesting enough, however, that it is considered of note when a theorem in ZFC ( ZF plus AC ) is logically equivalent ( with just the ZF axioms ) to the axiom of choice, and mathematicians look for results that require the axiom of choice to be false, though this type of deduction is less common than the type which requires the axiom of choice to be true.

Assuming ZF is consistent, Paul Cohen employed the technique of forcing, developed for this purpose, to show that the axiom of choice itself is not a theorem of ZF by constructing a much more complex model which satisfies ZF ¬ C ( ZF with the negation of AC added as axiom ) and thus showing that ZF ¬ C is consistent.

The restricted principle " Every partially ordered set has a maximal totally ordered subset " is also equivalent to AC over ZF.

A still weaker example is the axiom of countable choice ( AC < sub > ω </ sub > or CC ), which states that a choice function exists for any countable set of nonempty sets.

For example, if we abbreviate by BP the claim that every set of real numbers has the property of Baire, then BP is stronger than ¬ AC, which asserts the nonexistence of any choice function on perhaps only a single set of nonempty sets.

The much stronger axiom of determinacy, or AD, implies that every set of reals is Lebesgue measurable, has the property of Baire, and has the perfect set property ( all three of these results are refuted by AC itself ).

Adenylate cyclase (, also known as adenylyl cyclase, adenyl cyclase or AC ) is an enzyme with key regulatory roles in nearly all cells.

The best known AC class is class III or AC-III ( Roman numerals are used for classes ).

As of 2012, no crystal structure is available for class I AC.

* Soluble AC ( sAC ) is not a transmembrane form and is not regulated by G proteins or forskolin, instead acts as a bicarbonate / pH sensor.

These are the smallest of the AC enzyme classes ; the AC-IV from Yersinia is a dimer of 19 kDa subunits with no known regulatory components.

A moving coil meter indicates the average of any varying current through it, which is zero for AC.

There is a total of, ( double track ( as of 1998 )), of which are electrified, mainly at 3, 000 volts DC but with at 25 kV 50 Hz AC ( 2004 ) and all on standard gauge of.

Electrification is at 3 kV DC, with the exception of the new high-speed lines, and of two recently electrified lines in the south of the country which are at 25 kV AC.

** Luxembourg — no voltage change at the border ( the line Arlon-Luxembourg is at 3 kV DC and the line Gouvy-Luxembourg is at 25 kV AC )

Robert James Lee " Bob " Hawke AC GCL ( born 9 December 1929 ) is a former Australian politician who served as the 23rd Prime Minister of Australia from 1983 to 1991.