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The shoulder joint is a ball and socket joint between the scapula and the humerus. However the soet of the glenoid cavity of the scapula is itself quite shallow and is made deeper by the addition of the glenoid labrum. The glenoid labrum is a ring of [[cartilage|space|website=radref. org}}, in turn citing: Petersson, Claes J. ; Redlund-Johnell, Inga (2009). "Joint Space in Normal Gleno-Humeral Radiographs". Acta Orthopaedica Scandinavica. 54 (2): 274–276. doi:10. 3109/17453678308996569. ISSN 0001-6470. . mw-parser-output cite. citation{font-style:inherit}. mw-parser-output . citation q{quotes:"\"""\"""'""'"}. mw-parser-output . citation . cs1-lock-free a{background:url("//upload. wikimedia. org/wikipedia/commons/thumb/6/65/Lock-green. svg/9px-Lock-green. svg. png")no-repeat;background-position:right . 1em center}. mw-parser-output . citation . cs1-lock-limited a,. mw-parser-output . citation . cs1-lock-registration a{background:url("//upload. wikimedia. org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2. svg/9px-Lock-gray-alt-2. svg. png")no-repeat;background-position:right . 1em center}. mw-parser-output . citation . cs1-lock-subscription a{background:url("//upload. wikimedia. org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2. svg/9px-Lock-red-alt-2. svg. png")no-repeat;background-position:right . 1em center}. mw-parser-output . cs1-subscription,. mw-parser-output . cs1-registration{color:#555}. mw-parser-output . cs1-subscription span,. mw-parser-output . cs1-registration span{border-bottom:1px dotted;cursor:help}. mw-parser-output . cs1-ws-icon a{background:url("//upload. wikimedia. org/wikipedia/commons/thumb/4/4c/Wikisource-logo. svg/12px-Wikisource-logo. svg. png")no-repeat;background-position:right . 1em center}. mw-parser-output code. cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}. mw-parser-output . cs1-hidden-error{display:none;font-size:100%}. mw-parser-output . cs1-visible-error{font-size:100%}. mw-parser-output . cs1-maint{display:none;color:#33aa33;margin-left:0. 3em}. mw-parser-output . cs1-subscription,. mw-parser-output . cs1-registration,. mw-parser-output . cs1-format{font-size:95%}. mw-parser-output . cs1-kern-left,. mw-parser-output . cs1-kern-wl-left{padding-left:0. 2em}. mw-parser-output . cs1-kern-right,. mw-parser-output . cs1-kern-wl-right{padding-right:0. 2em}

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