A spinal implant (100, 30C 400, 500) comprising: a solid frame having a medial solid wall defining a medial solid wall thickness denoted by a medial solid wall surface thickness transverse to the medial solid wall, a lateral solid wall defining a lateral solid wall thickness denoted by a lateral solid wall surface thickness transverse to the lateral solid wall, a posterior solid wall defining a posterior solid wall thickness denoted by a posterior solid wall surface thickness transverse to the posterior solid wall, and an anterior solid wall defining an anterior solid wall thickness denoted by an anterior solid wall surface thickness transverse to the anterior solid wall; a porous inner layer disposed within the solid frame, the porous inner layer having an exposed superior surface, an exposed inferior surface, a medial porous wall defining a medial porous wall thickness denoted by a medial porous wall surface thickness transverse to the medial porous wall, a lateral porous wall defining a lateral porous wall thickness denoted by a lateral porous wall surface thickness transverse to the lateral porous wall, a posterior porous wall defining a posterior porous wall thickness denoted by a posterior porous wall surface thickness transverse to the posterior porous wall, and an anterior porous wall defining an anterior porous wall thickness denoted by an anterior porous wall surface thickness transverse to the anterior porous wall, an inner first cavity extending in a superior-inferior direction and being defined by the porous inner layer and the solid frame; wherein the solid frame has one or more ribs extending from the medial wall to the lateral wall above the superior and inferior surface, and the porous posterior wall thickness and the porous anterior wall thickness are less than the posterior solid wall thickness and the anterior solid wall thickness respectively, and the porous medial wall thickness and the porous lateral wall thickness are greater than the medial solid wall thickness and the lateral solid wall thickness respectively. a solid frame having a medial solid wall defining a medial solid wall thickness denoted by a medial solid wall surface thickness transverse to the medial solid wall, a lateral solid wall defining a lateral solid wall thickness denoted by a lateral solid wall surface thickness transverse to the lateral solid wall, a posterior solid wall defining a posterior solid wall thickness denoted by a posterior solid wall surface thickness transverse to the posterior solid wall, and an anterior solid wall defining an anterior solid wall thickness denoted by an anterior solid wall surface thickness transverse to the anterior solid wall; a porous inner layer disposed within the solid frame, the porous inner layer having an exposed superior surface, an exposed inferior surface, a medial porous wall defining a medial porous wall thickness denoted by a medial porous wall surface thickness transverse to the medial porous wall, a lateral porous wall defining a lateral porous wall thickness denoted by a lateral porous wall surface thickness transverse to the lateral porous wall, a posterior porous wall defining a posterior porous wall thickness denoted by a posterior porous wall surface thickness transverse to the posterior porous wall, and an anterior porous wall defining an anterior porous wall thickness denoted by an anterior porous wall surface thickness transverse to the anterior porous wall, an inner first cavity extending in a superior-inferior direction and being defined by the porous inner layer and the solid frame; wherein the solid frame has one or more ribs extending from the medial wall to the lateral wall above the superior and inferior surface, and the porous posterior wall thickness and the porous anterior wall thickness are less than the posterior solid wall thickness and the anterior solid wall thickness respectively, and the porous medial wall thickness and the porous lateral wall thickness are greater than the medial solid wall thickness and the lateral solid wall thickness respectively.